Jump to main content.

Return to home page

On This Page

Connecticut State Report
Other states that contain this watershed:
Massachusetts, Lower Connecticut Watershed

For More Information:

Download Excel compatible information

Download GIS Information (Internet Explorer only)

Water Quality Data Available for this Watershed

Connecticut, Lower Connecticut Watershed


Click on the watershed for an interactive map

Search for a waterbody within Lower Connecticut
Enter Waterbody Name:
Features

Assessment Summary for Reporting Year 2008
Connecticut, Lower Connecticut Watershed

Description of this table
Click here to list Threatened and Impaired Waters Only
NOTE: Click on the underlined "Waterbody Name" to view a Waterbody report.
Waterbody Name Waterbody ID Location Map Waterbody Type Size Units Status State TMDL Development Status
1860 Reservoir (Griswold Pond) (Wethersfield) CT4010-00-1-L1_01 Southwestern Wethersfiled, Near Rocky Hill And Newington Borders, West Side Of Highland Street (Headwater Of Goff Brook). Waterbody Map Freshwater Lake 27.2 Acres Good  
Angus Park Pond (Glastonbury) CT4009-00-2-L4_01 Impoundment Of Roaring Brook, East Of Rte 83 Glastonbury. Waterbody Map Freshwater Lake 9.4 Acres Impaired TMDL needed
Babcock Pond (Colchester) CT4704-00-1-L3_01 South Of Rt 16, Southeastern Colchester. Within Babcock Pond Wildlife Management Area. Waterbody Map Freshwater Lake 122.8 Acres Good  
Bashan Lake (East Haddam) CT4710-00-1-L1_01 North Central East Haddam, Drains To Moodus Reservoir. Waterbody Map Freshwater Lake 265.5 Acres Good  
Batterson Park Pond (Farmington/New Britain) CT4401-00-1-L1_01 Southeast Farmington - Northeastern Border Of New Britain. Waterbody Map Freshwater Lake 145.5 Acres Impaired TMDL completed
Beaver Brook (Lyme)-01 CT4803-00_01 From Mouth At Eightmile River, Along West Side Of Route 156, Us To Confluence With Cedar Pond Brook, Lyme. Waterbody Map River 1.9 Miles Good  
Beaver Meadow Brook-01 CT4015-02_01 From Mouth At Confluence With Pole Bridge Brook (Above Mill Creek), Us To Headwaters, Just Us Of Beaver Meadow Road Crossing, Haddam Waterbody Map River 2.6 Miles Good  
Belcher Brook-01 CT4601-00_01 From Mouth At Mattabasset River Us To Source At Silver Lake, Berlin. Waterbody Map River 3.7 Miles Impaired TMDL completed
Beseck Lake (Middlefield) CT4607-10-1-L1_01 East Central Middlefield. Waterbody Map Freshwater Lake 112.8 Acres Impaired TMDL needed
Black Hall River-01 CT4021-00_01 From Head Of Tide (.25 Miles Ds Of Confluence With Sawmill Brook, And .50 Miles Ds Of I95 Crossing), Us To Black Hall Pond Outlet (Black Hall Pond, Not Included). Waterbody Map River 2.6 Miles Good  
Blackledge River-01 CT4707-00_01 From Mouth At Confluence With Jeremy River, At Head Of Salmon River (Near River Road), Colchester, Us To Headwaters (Near Converse Road, Just Off Birch Mountain Road), Bolton. Waterbody Map River 16.4 Miles Good  
Broad Brook (East Windsor-Ellington)-02 CT4206-00_02 From Broad Brook Mill Pond Inlet, East Windsor, Us To Headwaters, Ellington, Just Us Of Snipsic Forest Road Crossing. Waterbody Map River 9.0 Miles Impaired TMDL needed
Broad Brook(East Windsor)-01 CT4206-00_01 From Mouth At Scantic River, Us To Broad Brook Mill Pond, East Windsor, Just Us Of Main Street (Route 191) Crossing. Waterbody Map River 1.0 Miles Impaired TMDL needed
Buckhorn Brook (Enfield)-01 CT4205-00_01 From Mouth At Confluence With Scantic River, Us To Marsh (Us Of Town Farm Road Crossing) Near Inlet From Tobacco Pond No 2, Enfield. Waterbody Map River 2.0 Miles Impaired TMDL needed
Cabin Brook-01 CT4703-01_01 From Mouth At Confluence With Nelkin Brook (In Marsh Ds Of Cabin Road Crossing), Us Under Route 2/Route 11 Interchange To Confluence With Small Tributary Near Exit 20 Ramp, Colchester. Waterbody Map River 1.5 Miles Impaired TMDL needed
Cabin Brook-02 CT4703-01_02 From Confluence With Small Tributary Near Exit 20 Ramp (Us Of Route 2/Route 11 Interchange), Us To Headwaters On South Side Of Parum Road (Route 354), North Of Dutton Swamp (Us Of Mcdonald Road Crossing), Colchester. Waterbody Map River 1.0 Miles Good  
Cedar Lake (Chester) CT4017-03-1-L4_01 North Of Rt. 148, Chester. Waterbody Map Freshwater Lake 70.7 Acres Good  
Center Spring Park Pond (Manchester) CT4500-14-1-L1_01 Center Of Manchester, Impoundment Of Bigalow Brook. Waterbody Map Freshwater Lake 5.9 Acres Good  
Charters Brook-01 CT4501-00_01 From Mouth At Shenipsit Lake Tolland Us To Headwaters Near Webster Rd Ellington Waterbody Map River 6.2 Miles Impaired TMDL needed
Clark Creek-02 CT4000-54_02 From Falls Near Route 154 Crossing, Us To Headwaters At Confluence Of Roaring And Deep Hollow Brooks, Haddam Waterbody Map River .5 Miles Good  
Coginchaug River-01 CT4607-00_01 From Mouth At Mattebessett River (At Cromwell Border), Us To Downstream Side Of Route 3 Crossing, Middletown. Waterbody Map River 2.0 Miles Good  
Coginchaug River-02 CT4607-00_02 From Downstream Side Of Route 3 Crossing, Us To Downstream Side Of Route 66 Crossing (Just Us Of Veterans Memorial Park), Middletown. Waterbody Map River .7 Miles Impaired TMDL completed
Coginchaug River-03 CT4607-00_03 From Downstream Side Of Route 66 Crossing (Just Us Of Veterans Memorial Park), Us To Starr Mill Pond Dam, Middletown. Waterbody Map River .6 Miles Impaired TMDL completed
Coginchaug River-04 CT4607-00_04 From Starr Mill Pond Inlet, Us (Past Wadsworth Falls) To Strictland Road Crossing, Middlefield. Waterbody Map River 4.2 Miles Impaired TMDL completed
Coginchaug River-05 CT4607-00_05 From Strictland Road Crossing, Middlefield, Us To Meeting House Hill Road Crossing, Durham. Waterbody Map River 4.9 Miles Impaired TMDL completed
Coginchaug River-06 CT4607-00_06 From Meeting House Hill Road Crossing, Durham, Us To Headwaters (Us Of Route 72 Crossing, Between Bluff Head And Broomstick Ledges), North Guilford. Waterbody Map River 3.6 Miles Impaired TMDL completed
Coles Brook-01 CT4600-22_01 From Mouth At Mattabasset River, Us To Headwaters Above Shunpike Road (Route 3) Crossing, Cromwell. Waterbody Map River 3.1 Miles Impaired TMDL completed
Connecticut River-01 CT4000-00_01 From Head Of Estuary At Chapman Pond Outlet, East Haddam, Us To Northern Most Boundary Of Hurd State Park, East Hampton. Waterbody Map River 10.3 Miles Impaired TMDL needed
Connecticut River-02 CT4000-00_02 From Northern Most Boundary Of Hurd State Park, East Hampton, Us To Confluence With Reservoir Brook (Adjacent To Gildersleeve Island), Portland. Waterbody Map River 10.5 Miles Impaired TMDL needed
Connecticut River-03 CT4000-00_03 From Reservoir Brook Confluence (Adjacent To Gildersleeve Island), Portland, Us To Ma Border. Waterbody Map River 35.3 Miles Impaired TMDL needed
Crooked Brook (Berlin)-01 CT4601-01_01 From Mouth At Belcher Brook (Near Norton Road), Us To Swede Pond Outlet, Berlin. Waterbody Map River 1.2 Miles Good  
Crooked Brook (Berlin)-02 CT4601-01_02 From Swede Pond Inlet, Us To Elton Rd Crossing, Berlin. Waterbody Map River .3 Miles Impaired Non-pollutant impairment
Crooked Brook (Berlin)-03 CT4601-01_03 From Elton Rd Crossing Us To Headwaters, Berlin. Waterbody Map River .7 Miles Good  
Crystal Lake (Middletown) CT4013-05-1-L1_01 South Of Randolph Road, Middletown. Waterbody Map Freshwater Lake 31.0 Acres Impaired TMDL needed
Day Pond (Cholchester) CT4700-02-1-L1_01 Impoundment And Headwaters Of Day Pond Brook. Day Pond Road, Colchester (East Of Rte. 149). Waterbody Map Freshwater Lake 7.4 Acres Good  
Dooley Pond (Middletown) CT4013-08-1-L1_01 East Of Rt 17, Middletown, 1.5 Miles South Of Randolph Rd. Waterbody Map Freshwater Lake 15.2 Acres Good  
Eightmile River (Lyme)-01 CT4800-00_01 From Mouth At Connecticut River, Hamburg Cove (Part Of Connecticut River Tidal Area), Us To Headwaters At Peck Meadow Pond Outlet Dam. Waterbody Map River 12.2 Miles Impaired TMDL needed
Eightmile River, East Branch (Salem)-01 CT4802-00_01 From Mouth At Eight Mile River (Ds Of Route 156 Crossing), Lyme, Us To To Headwaters At Major Kennys Pond (Just Us Of Witch Meadow Road Crossing), Salem. Waterbody Map River 8.0 Miles Good  
Falls River-01 CT4019-00_01 From Falls River Pond Oulet Dam (Separation Of Connecticut River Saltwater Influence), Essex, Us To Dam At Tower Hill Lake Outlet, Deep River (Notincluding Messerschmidts Or Wrights Ponds, Both Treated As Separate Waterbodies). Waterbody Map River 8.1 Miles Good  
Flat Brook (Marlborough)-01 CT4707-06_01 From Mouth At Blackledge River (Ds Of Standish Drive Crossing), Marlborough, Us To Headwaters At Diamond Lake, Glastonbury. Waterbody Map River 2.0 Miles Good  
Freshwater Brook-01 CT4003-00_01 From Mouth At Confluence With Connecticut River (Ds Of Railroad Crossing), Us To Elm Street Crossing (Between Washington Road And Moody Road), Enfield. Waterbody Map River 3.4 Miles Good  
Freshwater Brook-04 CT4003-00_04 From Elm Street Crossing (Between Washington Road And Moody Road), Us To Confluence With Jawbuck Brook, Enfield. Waterbody Map River .3 Miles Good  
Gages Brook-01 CT4503-01_01 From Mouth At Inlet To Walker Reservoir East (Head Of Tankerhoosen River), Vernon, Us To Headwaters At Mountain Springs Road Dam Outlet (Just Us Of Mountain Springs Road Crossing), Tolland. Waterbody Map River 2.0 Miles Good  
Gay City Pond (Hebron) CT4707-00-2-L2_01 Gay City State Park. Impoundment Of Black Ledge River. Nw Corner Of Hebron. Waterbody Map Freshwater Lake 5.1 Acres Impaired TMDL completed
Great Hill Pond (Portland) CT4000-40-1-L1_01 Great Hill Pond Road, Portland, 0.75 Miles Due North Of Rt. 66, Near East Hampton Border. Waterbody Map Freshwater Lake 71.9 Acres Good  
Harris Brook (Salem)-01 CT4801-00_01 From Mouth At East Branch Eightmile River (Just Ds Of Old Farm Road Crossing), Us To Salter Farm Pond Outlet Dam On Byron Clark Pond (Just Us Of Salter Road Crossing), Salem. Waterbody Map River 1.2 Miles Good  
Hatchery Brook-01 CT4601-02_01 From Mouth At Confluence With Belcher Brook, Us To Area Adjacent To Lions Club Pool (Just Us Of Norton Road Crossing), Berlin. Waterbody Map River 1.9 Miles Impaired TMDL needed
Hatchery Brook-02 CT4601-02_02 From Area Adjacent To Lions Club Pool (Just Us Of Norton Road Crossing), Us To Headwaters In Marsh (Us Of Orchard Road Crossing) Near Connecticut Dep, Kensington Salmon Hatchery, Berlin. Waterbody Map River 2.0 Miles Good  
Hayward, Lake (East Haddam) CT4800-04-1-L1_01 Northeast Corner Of East Haddam. Waterbody Map Freshwater Lake 172.4 Acres Good  
Higganum Reservoir (Haddam) CT4014-03-2-L1_01 West Of Rt 81 Just South Of Higganum Center. Waterbody Map Freshwater Lake 26.4 Acres Good  
Hockanum River-01 CT4500-00_01 From Mouth At Connecticut River, East Hartford, Us To Cellu Company Dam, The First Dam At Scotland Impoundment (Two Dams Just Ds Of This Dam), Includes Impounded Water Behind East Hartford Town Hall. Waterbody Map River 4.3 Miles Impaired TMDL needed
Hockanum River-02 CT4500-00_02 From Cellu Company Dam (First Dam At Scotland Impoundment), Us To Confluence With South Fork Hockanum (Aka Hop) River, Just Us Of "Laurel Lake", Manchester. Waterbody Map River 3.6 Miles Impaired TMDL needed
Hockanum River-03 CT4500-00_03 From Confluence With South Fork Hockanum (Aka Hop) River (Just Us Of "Laurel Lake"), Us To Union Pond Outlet Dam, Manchester. Waterbody Map River 3.4 Miles Impaired TMDL needed
Hockanum River-04a CT4500-00_04a From Inlet To Union Pond, Manchester, Us To Confluence With Tankerhoosen River, Vernon. Waterbody Map River 1.4 Miles Impaired TMDL needed
Hockanum River-04b CT4500-00_04b From Confluence With Tankerhoosen River, Vernon, Us To Marsh (Approximatly One Mile Ds Of Dart Hill Road Crossing, Parallel To Route 83, Near Neak Road), Vernon. Waterbody Map River 1.7 Miles Impaired TMDL needed
Hockanum River-05 CT4500-00_05 From Marsh Exit (Approximatly One Mile Ds Of Dart Hill Road Crossing, Parallel To Route 83, Near Neak Road), Vernon, Us To Vernon Potw (Just Ds Of Route 74 Crossing). Waterbody Map River 2.5 Miles Impaired TMDL needed
Hockanum River-06a CT4500-00_06a From Vernon Potw (Just Ds Of Route 74 Crossing), Vernon, Us To Windsor Avenue Crossing (Route 74), Vernon. Waterbody Map River 3.0 Miles Impaired TMDL needed
Hockanum River-06b CT4500-00_06b From Windsor Avenue Crossing (Route 74), Vernon, Us To Vernon Ave, Vernon (Rockville). Waterbody Map River .9 Miles Impaired TMDL needed
Hockanum River-07 CT4500-00_07 From Vernon Ave (Outlet Of Culvert), Rockville, Us To Paper Mill Pond Outlet Dam (Inlet To Culvert). Waterbody Map River .5 Miles Impaired Non-pollutant impairment
Hockanum River-08 CT4500-00_08 From Paper Mill Pond Outlet Dam, Rockville, Us To Shenipsit Lake Outlet Dam. Waterbody Map River .6 Miles Impaired TMDL needed
Holbrook Pond (Hebron) CT4705-00-1-L1_01 Northeast Corner Of Hebron; Northeast Of Rt 85. Waterbody Map Freshwater Lake 68.7 Acres Good  
Hubbard Brook-01 CT4007-00_01 From Mouth At Connecticut River, Glastonbury, Us To Headwaters At Outlet Of Neipsic Bog, Just Us Of Neipsic Road Crossing, Near Route 2 (Out. Waterbody Map River 5.5 Miles Good  
Jeremy River-01 CT4705-00_01 From Mouth At Confluence With Blackledge River, At Head Of Salmon River, Us To Norton Paper Company Dam (Just Us Of Route 149 Crossing), North Westchester (Colchester). Waterbody Map River 1.2 Miles Good  
Jeremy River-02 CT4705-00_02 From Norton Paper Company Dam (Just Us Of Route 149 Crossing), North Westchester (Colchester), Us To Headwaters At Holbrook Pond, Hebron. Waterbody Map River 9.1 Miles Good  
John Hall Brook-01 CT4600-05_01 From Mouth At Confluence With Stocking Brook (Ds Of Southington Road Crossing), Us To Kenmere Reservoir Outlet, Berlin. Waterbody Map River 1.0 Miles Impaired TMDL completed
John Hall Brook-02 CT4600-05_02 From Kenmere Reservoir Inlet, Us To Hallmere Reservoir Outlet Dam, Berlin. Waterbody Map River 1.0 Miles Impaired TMDL completed
Lis Eb Inner - Black Hall River (Mouth), Old Lyme CT-E1_025-SB See Map For Boundaries. Eastern Portion Of Lis, Inner Estuary, Black Hall River From Outlet Southest Of Great Island, Us To Route 156 Crossing, Old Lyme. Waterbody Map Estuary .1 Square Miles Good  
Lis Eb Inner - Black Hall River (Upper), Old Lyme CT-E1_026-SB See Map For Boundaries. Eastern Portion Of Lis, Inner Estuary, Black Hall River From Route 156 Crossing, Us To Saltwater Limit At Mile Creek Road Crossing, Old Lyme. Waterbody Map Estuary .0 Square Miles Impaired TMDL needed
Lis Eb Inner - Connecticut River (Lower), Essex CT-E1_029-SB See Map For Boundaries. Eastern Portion Of Lis, Inner Estuary, Connecticut River From I95 Crossing, Us To Area Just Above Brockway Island, Essex. Waterbody Map Estuary 3.2 Square Miles Impaired TMDL needed
Lis Eb Inner - Connecticut River (Mouth), Old Lyme CT-E1_024-SB See Map For Boundaries. Eastern Portion Of Lis, Inner Estuary, Connecticut River From Outlet At Griswold Point, Us To I 95 Crossing (Includes North And South Coves, Lower Lieutenant River And Waters Around Great Island Upto Rr Crossings), Old Lyme. Waterbody Map Estuary 3.3 Square Miles Impaired TMDL needed
Lis Eb Inner - Connecticut River (Upper), Chester CT-E1_031-SB See Map For Boundaries. Eastern Portion Of Lis, Inner Estuary, Connecticut River From Area Just Above Brockway Island, Us To Saltwater Limit Just Above Chapman Pond Inlet (Adjacent To Gillette Castle State Park), East Haddam. Waterbody Map Estuary 2.1 Square Miles Impaired TMDL needed
Lis Eb Inner - Duck River, Old Lyme CT-E1_027-SB See Map For Boundaries. Eastern Portion Of Lis, Inner Estuary, Duck River From Rr Crossing Near Route 156 Crossing, Us To Saltwater Limit At Elm Street, Old Lyme. Waterbody Map Estuary .0 Square Miles Impaired TMDL needed
Lis Eb Inner - Hamburg Cove/Eightmile River (Mouth), Lyme CT-E1_030 See Map For Boundaries. Eastern Portion Of Lis, Inner Estuary, Hamburg Cove (Eightmile River From Mouth On Connecticut River Near Brockway Island, Us To Saltwater Limit Adjacent To Cove Road (Just South Of Intersection With Route 156), Essex. Waterbody Map Estuary .2 Square Miles Good  
Lis Eb Inner - Leiutenant River, Old Lyme CT-E1_028-SB See Map For Boundaries. Eastern Portion Of Lis, Inner Estuary, Leiutenant River From Route 156 Crossing, Us To Saltwater Limit Adjacent To Longacre Lane, Old Lyme. Waterbody Map Estuary .1 Square Miles Impaired TMDL needed
Lis Eb Midshore - Old Saybrook, Ct River CT-E3_009-SB See Map For Boundaries. Eastern Portion Of Lis From Sb/Sa Water Quality Boundary, Lynde Point In Ct River Mouth Old Saybrook, To Approximately 1000 Ft Offshore East Of White Sands Beach, Old Lyme (Mouth Of Connecticut River). Waterbody Map Estuary 2.9 Square Miles Good  
Little Brook (Rocky Hill)-01 CT4600-07_01 From Mouth At Mattabasset River Us To Source Near Trinity Rd, Rocky Hill. Waterbody Map River 1.9 Miles Impaired TMDL completed
Long Hill Brook-01 CT4013-08_01 From Mouth At Sumner Brook, Us To Pameacha Pond Outlet Dam, Just Us Of Pamecha Avenue Crossing, Middletown. Waterbody Map River .5 Miles Impaired TMDL needed
Lyman Brook-01 CT4707-12_01 From Mouth At Blackledge River, Just Us Of South Main Street Crossing (Ds Of Route 2, Exit 15 Offramp), Us To Headwaters, Marlborough. Waterbody Map River 3.8 Miles Good  
Mattabesset River-01 CT4600-00_01 From Mouth At Connecticut River, Cromwell, Us To Route 3 Crossing (South Of Route 372 Intersection). Waterbody Map River 3.3 Miles Impaired TMDL completed
Mattabesset River-02 CT4600-00_02 From Route 3 Crossing, Cromwell And Middletown Townline, Us To High Pond Dam (Just Us Of Berlin Street Crossing), East Berlin. Waterbody Map River 3.7 Miles Impaired TMDL needed
Mattabesset River-03 CT4600-00_03 From High Pond Dam Just Us Of Berlin Street Crossing, East Berlin, Us To Confluence With Willow Brook. Waterbody Map River 3.6 Miles Impaired TMDL needed
Mattabesset River-04 CT4600-00_04 From Confluence With Willow Brook, Us To Kensington Dam At Outlet Of Railroad Pond (Just Us Of Kensington Road Crossing), Berlin. Waterbody Map River 2.8 Miles Impaired TMDL needed
Mattabesset River-05 CT4600-00_05 From Kensington Dam At Outlet Of Railroad Pond (Just Us Of Kensington Road Crossing), Berlin, Us To Inlet Of Paper Goods Pond (Segment Includes Both Ponds). Waterbody Map River 1.0 Miles Impaired TMDL needed
Mattabesset River-06 CT4600-00_06 From Inlet To Paper Goods Pond, Us To Lower Hart Pond Outlet Dam (Both Lower And Upper Hart Ponds Are Not In Segment). Waterbody Map River 1.3 Miles Impaired TMDL needed
Mattabesset River-07 CT4600-00_07 From Inlet To Upper Hart Pond (Both Lower And Upper Hart Ponds Are Not In Segment), Us To Wasel Reservoir Inlet Dam (Segment Includes Smith Brothers Pond). Waterbody Map River 1.6 Miles Good  
Meadow Brook (Colchester)-01 CT4703-00_01 From Mouth At Confluence With Jeremy River (Parallel To Route 2, Us Of Prospect Hill Road Crossing), Us To Lincoln Lake Outlet Dam On Levy Pond (Just Us Of Levy Road Crossing), Colchester. Waterbody Map River 3.1 Miles Good  
Meadow Brook (Colchester)-02 CT4703-00_02 From Inlet To Levy Pond (Just Ds Of Middletown Road (Route 16) Crossing), Us To Hw At Confluence Of Cabin Brook And Nelkin Brook (Adjacent To Lakeview Court), Colchester. Waterbody Map River .8 Miles Good  
Messerschmidt Pond (Westbrook/Deep River) CT4019-00-1-L3_01 Rt 145 Westbrook; Straddles Westbrook/Deep River Border. Waterbody Map Freshwater Lake 81.7 Acres Good  
Mill Brook-01 (Old Lyme) CT4020-06_01 From Mouth At Lieutenant River, Us To Upper Mill Pond Outlet, Just Us From Sill Lane Crossing, Old Lyme. Waterbody Map River 1.2 Miles Good  
Mill Brook-02 (Old Lyme) CT4020-06_02 From Upper Mill Pond Dam At Outlet (Including Upper Mill Pond), Us To Rogers Lake Dam Outlet. Waterbody Map River .7 Miles Good  
Mill Pond (Newington) CT4402-04-2-L1_01 Municipal Park In Newington; S Of Rt 175 Near Intersection Of Rts 175 And 176 Waterbody Map Freshwater Lake 2.7 Acres Good  
Millers Pond (Durham) CT4013-00-1-L1_01 Durham Waterbody Map Freshwater Lake 29.9 Acres Not_Assessed  
Miner Brook-01 CT4600-26_01 From Mouth At Confluence With Mattabasset River, Cromwell/Middletown Border, Us To Headwaters (In Marsh Just Us (South) Of Westfield Street Crossing, Parallel With Route 217), Middletown. Waterbody Map River 2.9 Miles Impaired TMDL completed
Moodus Reservoir (East Haddam) CT4710-00-1-L2_01 Northeast East Haddam. Waterbody Map Freshwater Lake 440.7 Acres Good  
Muddy Brook (Suffield)-01 CT4101-00_01 From Mouth At Stony Brook, Suffield, Us To Confluence With Philo Brook. Waterbody Map River 2.2 Miles Impaired TMDL needed
Muddy Brook (Suffield)-02 CT4101-00_02 From Confluence With Philo Brook Us To Headwaters (Confluence Of Still Brook And Spears Brook). Waterbody Map River 7.5 Miles Good  
North Branch Park River-01 CT4404-00_01 From Mouth At Confluence With Park River Just Ds Of I84 Crossing, Us To Entrance Of Conduit (Entire Segment In Pipe) Near Farmingotn Avenue, Hartford. Waterbody Map River .5 Miles Impaired TMDL needed
North Branch Park River-02 CT4404-00_02 From Ds Side Of Farmington Avenue (At Entrance Of Conduit), Us To Confluence With Wash Brook (Just Ds Of Confluence Of Wash Brook And Beamans Brook), Bloomfield. Waterbody Map River 5.4 Miles Impaired TMDL needed
Norwich Pond (Lyme) CT4800-10-1-L1_01 Southeast Corner Of Lyme, Located Within Nehantic State Forest. Drains To Uncas Lake. Waterbody Map Freshwater Lake 29.4 Acres Good  
Park River-01 CT4400-00_01 From Mouth At Connecticut River, Us To Confuence With North Branch Park River, Just Ds Of I84 Crossing At Opening Of Conduit (Us Of Willow Street Crossing). Waterbody Map River 2.4 Miles Impaired TMDL needed
Pattaconk Brook-01 CT4017-03_01 From Mouth At Confluence With Great Brook (Us Of Head Of Chester Creek In Marsh), Us To Cedar Lake Outlet Dam, Just Us Of Route 148 Crossing, Chester (Cedar Lake Not Included). Waterbody Map River 4.0 Miles Good  
Pattaconk Brook-02 CT4017-03_02 From Cedar Lake Inlet, Us To Pattaconk Reservoir Oulet Dam, Chester. Waterbody Map River 1.5 Miles Good  
Pattaconk Reservoir (Chester) CT4017-03-1-L3_01 1.25 Miles North Of Rt 148, Cockaponset State Forest, Chester. Waterbody Map Freshwater Lake 52.3 Acres Good  
Pickerel Lake (Colchester/East Haddam) CT4710-06-1-L1_01 Southeast Corner Of Colchester, Extending Slightly Into E. Haddam. Drains To Moodus Reservoir Waterbody Map Freshwater Lake 82.1 Acres Impaired Non-pollutant impairment
Pine Brook-01 CT4709-00_01 From Mouth At Salmon River, Haddam, Us To Confluence With Pocotopaug Creek. Waterbody Map River 3.2 Miles Good  
Pine Brook-02 CT4709-00_02 From Confluence With Pocotopaug Creek, Us Past Route 66 Crossing, To Headwaters Just Us Of Clark Hill Road Crossing, East Hampton. Waterbody Map River 4.5 Miles Good  
Piper Brook-01 CT4402-00_01 From Mouth At Confluence With Trout Brook, Above South Branch Park River, West Hartford, Us (Under New Britian Avenue), To Conduit Opening, Us Side Of New Britain Ave (Segment Completely In Conduit). Waterbody Map River .1 Miles Impaired Non-pollutant impairment
Piper Brook-02 CT4402-00_02 From Conduit Entrance (Segment-01) Us Side Of New Britain Avenue, West Hartford, Us Into St. Marys Cemetary (Just Us Of Railroad Crossing And Parallel With Route 9) Where Pipe Emerges From Ground, New Britain. Waterbody Map River 5.8 Miles Impaired TMDL needed
Pocotopaug Creek-01 CT4709-04_01 From Mouth At Pine Brook (Us Of Route 151 Crossing And North Of Wilkes Road), Us To Old Chestnut Hill Road Crossing, East Hampton. Waterbody Map River 1.7 Miles Good  
Pocotopaug Creek-02 CT4709-04_02 From Old Chestnut Hill Road Crossing, East Hamption, Us To Pocotopaug Lake Outlet Dam (Just Us Of Route 66 Crossing). Waterbody Map River 2.7 Miles Impaired TMDL needed
Pocotopaug Lake (East Hampton) CT4709-04-1-L1_01 North Of Rt 66, East Hampton. Waterbody Map Freshwater Lake 502.3 Acres Impaired TMDL needed
Roaring Brook (Glastonbury)-01 CT4009-00_01 From Mouth At Connecticut River Us To Angus Park Pond Dam At Outlet (Angus Park Pond Not Included). Waterbody Map River 6.7 Miles Impaired TMDL needed
Roaring Brook (Glastonbury)-02 CT4009-00_02 From Angus Park Pond Inlet, East Glastonbury, Us To Buckingham Reservoir Outlet Dam Buckinham Reservoir Not Included). Waterbody Map River 2.8 Miles Good  
Roaring Brook (Glastonbury)-03 CT4009-00_03 From Buckingham Reservoir Inlet (Buckingham Res. Not Included), Us To Headwaters (Segment Entirely Within Manchester Drinking Water Supply Watershed). Waterbody Map River 2.4 Miles Good  
Rogers Lake (Lyme/Old Lyme) CT4020-06-1-L1_01 Lyme - Old Lyme Border. Waterbody Map Freshwater Lake 275.4 Acres Good  
Salmon Brook-01 (Glastonbury) CT4006-00_01 From Mouth On Keeney Cove (Connecticut River, Near Naubuc Avenue), Glastonbury, Us To Addison Pond Outlet, Glastonbury. Waterbody Map River 3.1 Miles Good  
Salmon Brook-02 (Glastonbury) CT4006-00_02 From Addison Pond Outlet, Us To Headwaters At Manchester Country Club Pond Dam, Glastonbury (Includes Addison Pond). Waterbody Map River 4.3 Miles Good  
Salmon River-01 CT4700-00_01 Mouth At Connecticut River, East Haddam, Us To Headwaters At Confluence Of Blackledge And Jeremy Rivers, Colchester. Waterbody Map River 10.4 Miles Impaired TMDL needed
Sawmill Brook (Middletown)-01 CT4604-00_01 From Mouth At Mattabasset River, Us To Headwater Above Atkin Street Pond (Highland Pond) Middletown. Waterbody Map River 3.0 Miles Impaired TMDL completed
Scantic River-01 CT4200-00_01 From Mouth At Connecticut River, Us To Confluence With Broad Brook, East Windsor. Waterbody Map River 9.4 Miles Impaired TMDL needed
Scantic River-02 CT4200-00_02 From Confluence With Broad Brook, East Windsor, Us To Somersville Pond Outlet, Somers (Passes Somers Wpcf At Upper End Below Lake). Waterbody Map River 13.6 Miles Good  
Scantic River-03 CT4200-00_03 From Somersville Pond Inlet, Somers, Us To Ma Border. Waterbody Map River 6.1 Miles Good  
Shenipsit Lake (Tolland/Ellington/Vernon) CT4500-00-1-L1_01 At Meeting Point Of Ellington, Vernon And Tolland. Ct Water Company Watershed. Waterbody Map Freshwater Lake 511.9 Acres Good  
Silver Lake (Berlin/Meriden) CT4601-00-1-L2_01 Southeast Corner Of Berlin, Extending Slightly Into Northeast Meriden. Waterbody Map Freshwater Lake 140.6 Acres Impaired TMDL needed
Somersville Pond (Somers) CT4200-00-4-L2_01 Near Eastern Border Of Somers With Enfield; Pond Is South Of Intersection Of Rte 190 And Rte 186. Waterbody Map Freshwater Lake 40.9 Acres Not_Assessed  
South Branch Park River-01 CT4400-01_01 From Mouth At Confluence With Park River, Us To Enterance Of Conduit (Entire Segment In Pipe Underground). Waterbody Map River .3 Miles Impaired TMDL needed
South Branch Park River-02 CT4400-01_02 From Entrance Of Conduit (Segment-01), Us To Confluence With Piper And Trout Brooks, Between Railroad Tracks And Route 173 (New Britian Avenue). Waterbody Map River 2.6 Miles Impaired TMDL needed
Spruce Brook (Berlin)-01 CT4600-13_01 From Mouth At Mattabasset River Us To Headwaters At Confluence Of East/West Spruce Brooks, Above Lamentation Brook (Lamentation Mountain Area). Waterbody Map River 4.2 Miles Impaired TMDL completed
Stocking Brook-01 CT4600-01_01 From Mouth At Confluence With Mattabesset River (Just Ds Of Lower Hart Pond Inlet), Us To Confluence With John Hall Brook (Ds Of Southington Road Crossing), Berlin. Waterbody Map River 1.3 Miles Good  
Stocking Brook-02 CT4600-01_02 From Confluence With John Hall Brook (Ds Of Southington Road Crossing), Us To Merimere Reservoir Outlet Dam (Just Us Of West Peak Drive Crossing), Berlin. Waterbody Map River 3.8 Miles Good  
Stony Brook (Suffield)-01 CT4100-00_01 From Mouth At Outlet On Canal Parallel To Connecticut River, Us To Confluence With Muddy Brook At Railroad Crossing, Suffield. Waterbody Map River 3.5 Miles Good  
Stony Brook (Suffield)-02 CT4100-00_02 From Confluence With Muddy Brook (At Railroad Crossing), Us (Paralell With Airport) To Degrayes Brook Confluence, Suffield. Waterbody Map River 4.9 Miles Good  
Stony Brook (Suffield)-03 CT4100-00_03 From Confluence With Degrayes Brook (Just Northwest Of Airport), Us To Headwaters (The Confluence Of Rocky Gutter Brook And Rattlesnake Brook), Suffield. Waterbody Map River 4.3 Miles Impaired TMDL needed
Sumner Brook-01 CT4013-00_01 From Mouth At Connecticut River, Middletown, Us To Confuence With Long Hill Brook. Waterbody Map River 1.0 Miles Impaired TMDL needed
Tankerhoosen River-01 CT4503-00_01 From Mouth At Hockanum River, Vernon (Ds Of Route 83/03 Crossing Near Manchester Border ), Us To Tankerhoosen Lake Outlet Dam, Vernon. Waterbody Map River 1.5 Miles Impaired TMDL needed
Tankerhoosen River-02 CT4503-00_02 From Tankerhoosen Lake Outlet Dam (Includes Lake), Vernon, Us To Walker Reservoir East Outlet (Headwater). Waterbody Map River 4.1 Miles Good  
Terramuggus, Lake (Marlborough) CT4708-00-1-L1_01 Intersection Of Routes 2 & 66, Northwest Corner Of Marlborough. Data Unavailable Freshwater Lake 81.3 Acres Good  
Tributary-Eightmile River (Lyme)-01 CT4800-15_01 From Mouth At West Side Of Eightmile River, Just Us Of Macintosh Road Crossing, Us To Headwaters, Lyme. Waterbody Map River 2.2 Miles Good  
Trout Brook-01 CT4403-00_01 From Mouth At Confluence With Piper Brook, Above South Branch Park River (Just Ds Of Railroad Crossing, Near New Britian Avenue), West Hartford, Us Under Route 84 Exit 42 (Trout Brook Drive) Ramp. Waterbody Map River 1.1 Miles Impaired TMDL needed
Trout Brook-02 CT4403-00_02 From Us Side Of Route 84 Exit 42 (Trout Brook) Ramp, West Hartford, Us To Park Road Crossing (Entire Segment Flows Through Concrete Channel). Waterbody Map River .9 Miles Impaired TMDL needed
Trout Brook-03 CT4403-00_03 From Park Road Crossing (Just Ds Of Boulevard Road Crossing), Us To Woodbridge Lake Outlet Dam, West Hartford. Waterbody Map River 6.0 Miles Impaired TMDL needed
Turkey Hill Reservoir (Haddam/Chester) CT4017-04-1-L1_01 Straddles Southern Border Of Haddam With Chester. Located Within Cockaponset State Forest, Bounded By Cedar Lake Road And Filley Road. Waterbody Map Freshwater Lake 75.9 Acres Not_Assessed  
Uncas Pond (Lyme) CT4800-16-1-L2_01 Southeast Lyme, Located Within Nehantic State Forest. Waterbody Map Freshwater Lake 69.0 Acres Good  
Union Pond (Manchester) CT4500-00-3-L3_01 Impoundment Of Hockanum River In Manchester At Union Street. Waterbody Map Freshwater Lake 49.9 Acres Impaired TMDL needed
Watchaug Brook (Somers)-01 CT4201-00_01 From Mouth At Confluence With Scantic River (Ds Of Watchaug Road Crossing), Us To Ct/Ma State Border, Somers. Waterbody Map River 2.1 Miles Impaired TMDL needed
Webster Brook-01 CT4603-00_01 From Mouth At Mattabasset River, Us To Headwaters Between Railroad Track And Stamm Road, Just Us Of Route 174 Crossing, Newington. Waterbody Map River 3.4 Miles Impaired TMDL completed
Willow Brook (Cromwell)-01 CT4600-27_01 From Mouth At Confluence With Mattabasset River (Ds Of Berlin Road (Route 372) Crossing, Us To Headwaters, Just Us Of Coles Road Crossing (Near Junctin Of Coles Road And Willow Brook Road), Cromwell. Waterbody Map River 1.4 Miles Impaired TMDL completed
Willow Brook (New Britain)-01 CT4602-00_01 From Mouth At Mattabasset River, Us To Outlet Of Conduit Under Buell Street, Near Intersection With Route 71a (Kensington Ave, East Of Hart Park), New Britain. Waterbody Map River 3.4 Miles Impaired TMDL needed
Willow Brook (New Britain)-02 CT4602-00_02 From Outlet Of Conduit Under Buell Street, Near Intersection With Route 71a (Kensington Ave) (East Of Hart Park), New Britain, Us To Shuttle Meadow Reservoir (Flows Through 2 Conduits). Waterbody Map River 2.6 Miles Good  
Wrights Pond (Westbrook/Deep River/Essex) CT4019-00-1-L4_01 Meeting Point Of Westbrook, Deep River And Essex. Waterbody Map Freshwater Lake 29.7 Acres Good  

Top of page


Causes of Impairment for Reporting Year 2008

Connecticut, Lower Connecticut

Description of this table
NOTE: Click on the underlined "Cause of Impairment" value to see a listing of those waters with that cause of impairment.
Cause of Impairment Size of Assessed Waters with Listed Causes of Impairment
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)		 Bays and
Estuaries
(Square Miles)
Alterations in Wetland Habitats 4.0    
Chlordane   49.9  
Non-Native Aquatic Plants   82.1  
Physical Substrate Habitat Alterations 14.3    
Enterococcus Bacteria 45.8   .1
Polychlorinated Biphenyls (PCBs) 56.0   5.4
Chlorophyll-A   760.6  
Other Flow Regime Alterations .3    
Turbidity   140.6  
Cause Unknown 90.8    
Excess Algal Growth   810.5  
Fecal Coliform     6.6
Nutrient/Eutrophication Biological Indicators   838.3  
Phosphorus, Total   112.8  
Chlorine 1.9    
Escherichia Coli (E. Coli) 193.3 45.5  
Mercury   140.6  
Sedimentation/Siltation   49.9  

Top of page



Probable Sources Contributing to Impairments for Reporting Year 2008

Connecticut, Lower Connecticut Watershed

Description of this table
Probable Source Size of Assessed Waters with Probable Sources of Impairments
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)		 Bays and
Estuaries
(Square Miles)
Accidental Release/Spill 1.9    
Agriculture 25.4    
Animal Feeding Operations (Nps) 9.0    
Atmospheric Deposition - Toxics   140.6  
Baseflow Depletion From Groundwater Withdrawals .3    
Channelization 18.3    
Combined Sewer Overflows 70.7   5.4
Contaminated Sediments   49.9  
Flow Alterations From Water Diversions .3    
Golf Courses 1.3    
Habitat Modification - Other Than Hydromodification 4.0    
Highway/Road/Bridge Runoff (Non-Construction Related)   145.5  
Illicit Connections/Hook-Ups To Storm Sewers 1.9    
Impacts From Hydrostructure Flow Regulation/Modification 2.1    
Industrial Point Source Discharge 2.7    
Internal Nutrient Recycling   253.4  
Landfills 3.6    
Livestock (Grazing Or Feeding Operations) 9.0    
Loss Of Riparian Habitat 10.5    
Marina/Boating Sanitary On-Vessel Discharges     6.6
Municipal Point Source Discharges 44.5    
Natural Sources     3.2
Non-Point Source     3.4
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems)     .0
Post-Development Erosion And Sedimentation   195.4  
Residential Districts     6.6
Sanitary Sewer Overflows (Collection System Failures) 21.0    
Sediment Resuspension (Clean Sediment)   140.6  
Site Clearance (Land Development Or Redevelopment) 1.3    
Source Unknown 209.6 737.5 5.5
Sources Outside State Jurisdiction Or Borders 56.0    
Unspecified Urban Stormwater 63.1 226.4 8.7
Upstream Impoundments (E.G., Pl-566 Nrcs Structures) 2.1    
Waterfowl   190.9 6.6

Top of page


TMDL Alternatives by Cause of Impairment for Reporting Year 2008


Connecticut, Lower Connecticut Watershed


No TMDL Alternatives reported.

Top of page

Cumulative TMDLs by Pollutant

Connecticut, Lower Connecticut Watershed

This chart includes TMDLs since October 1, 1995.

Description of this table
NOTE: Click on the underlined "Number of TMDLs Completed" value to see a listing of those approved TMDLs for the pollutant.
Pollutant Number of TMDLs Completed Number of Causes of
Impairment Addressed
Escherichia Coli (E. Coli) color.gif 45 45
Nitrogen, Total color.gif 2 2
Algal Growth color.gif 1 1
Chlorophyll-A color.gif 1 1
Phosphorus, Total color.gif 1 1

Total: 50 TMDLs; 0 Causes of Impairment



Top of page

Jump to main content.