Watershed Quality Assessment Report | WATERS

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Assessment Summary
Causes of Impairment
Probable Sources Contributing to Impairment
TMDL Alternatives by Cause of Impairment
Cumulative TMDLs by Pollutant

Montana State Report

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Montana, Upper Missouri Watershed

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Assessment Summary for Reporting Year 2008
Montana, Upper Missouri Watershed

Description of this table
Click here to list Threatened and Impaired Waters Only

Waterbody Name	Waterbody ID	Location	Map	Waterbody Type	Size	Units	Status	State TMDL Development Status
NOTE: Click on the underlined "Waterbody Name" to view a Waterbody report.
Avalanche Creek	MT41I002_010	Avalanche Gulch, Headwaters To Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	16.5	Miles	Impaired	Non-pollutant impairment
Battle Creek	MT41I002_020	Battle Creek, Headwaters To The Mouth (Sixteenmile Creek-Missouri River)	Waterbody Map	River	20.4	Miles	Impaired	TMDL needed
Beaver Creek	MT41I002_030	Beaver Creek, Headwaters To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	14.4	Miles	Impaired	TMDL needed
Beaver Creek	MT41I005_011	Beaver Creek, Headwaters To Nelson	Waterbody Map	River	13.3	Miles	Impaired	TMDL needed
Beaver Creek	MT41I005_012	Beaver Creek, Nelson To The Mouth (Missouri River Below Hauser Dam)	Waterbody Map	River	5.3	Miles	Impaired	TMDL needed
Boulder Creek	MT41I002_160	Boulder Creek, 3 Miles Above Mouth To Mouth (Confederate Gulch)	Waterbody Map	River	3.0	Miles	Good
Canyon Ferry Reservoir	MT41I003_010	Canyon Ferry Reservoir	Waterbody Map	Freshwater Lake	35,180.0	Acres	Impaired	TMDL needed
Cave Gulch	MT41I002_150	Cave Gulch, Headwaters To Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	6.4	Miles	Impaired	TMDL needed
Clancy Creek	MT41I006_120	Clancy Creek, Headwaters To The Mouth (Prickly Pear Creek)	Waterbody Map	River	11.6	Miles	Impaired	TMDL needed
Confederate Gulch	MT41I002_041	Confederate Gulch, Headwaters To Hunter Gulch	Waterbody Map	River	9.8	Miles	Impaired	TMDL needed
Confederate Gulch	MT41I002_042	Confederate Gulch, Hunter Gulch To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	5.1	Miles	Impaired	TMDL needed
Corbin Creek	MT41I006_090	Corbin Creek, Headwaters To The Mouth (Spring Creek)	Waterbody Map	River	2.5	Miles	Impaired	TMDL needed
Crow Creek	MT41I002_050	Crow Creek, The National Forest Boundary To The Mouth (Missouri River)	Waterbody Map	River	16.8	Miles	Impaired	TMDL needed
Crow Creek	MT41I002_060	Crow Creek, Crow Creek Falls To The National Forest Boundary	Waterbody Map	River	7.9	Miles	Impaired	TMDL needed
Deep Creek	MT41I002_070	Deep Creek, The National Forest Boundary To The Mouth (Missouri River)	Waterbody Map	River	18.1	Miles	Impaired	TMDL completed
Dry Creek	MT41I002_080	Dry Creek, Headwaters To The Mouth (Missouri River)	Waterbody Map	River	16.7	Miles	Impaired	TMDL needed
East Fork Indian Creek	MT41I002_170	East Fork Indian Creek, Headwaters To Mouth (Indian Creek)	Waterbody Map	River	4.7	Miles	Impaired	TMDL needed
Falls Gulch	MT41I005_030	Falls Gulch, Headwaters To Mouth (Holter Lake) T14n, R3w, Sec. 29	Waterbody Map	River	3.3	Miles	Impaired	TMDL needed
Fool Hen Creek	MT41I005_060	Fool Hen Creek, Headwaters To Mouth (Virgina Creek-Canyon Creek- Little Prickly Pear Creek)	Waterbody Map	River	1.7	Miles	Impaired	TMDL needed
Golconda Creek	MT41I006_070	Golconda Creek, Headwaters To The Mouth (Prickly Pear Creek) T 7n, R3w	Waterbody Map	River	3.7	Miles	Impaired	TMDL needed
Granite Creek	MT41I006_179	Granite Creek, Headwaters To Mouth (Austin Creek-Greenhorn Creek-Sevenmile Creek)	Waterbody Map	River	1.6	Miles	Good
Granite Creek	MT41I006_230	Granite Creek, Headwaters To The Mouth (Sevenmile Creek)	Waterbody Map	River	2.0	Miles	Impaired	TMDL needed
Hauser Lake	MT41I007_040	Hauser Lake	Waterbody Map	Freshwater Lake	3,800.0	Acres	Impaired	TMDL needed
Hellgate Gulch	MT41I002_090	Hellgate Gulch, Headwaters To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	11.5	Miles	Impaired	TMDL needed
Holter Lake	MT41I007_020	Holter Lake (Missouri River Mainstem Reservoir.)	Waterbody Map	Freshwater Lake	5,500.0	Acres	Impaired	TMDL needed
Indian Creek	MT41I002_100	Indian Creek, Headwaters To The Mouty (Missouri River)	Waterbody Map	River	7.9	Miles	Impaired	TMDL needed
Jackson Creek	MT41I006_190	Jackson Creek, Headwaters To Mouth (Mcclellan Creek-Prickly Pear Creek)	Waterbody Map	River	2.5	Miles	Impaired	TMDL needed
Jennies Fork	MT41I006_210	Jennies Fork, Headwaters To Mouth (Silver Creek-Missouri River)	Waterbody Map	River	1.2	Miles	Impaired	TMDL needed
Lake Helena	MT41I007_010	Lake Helena	Waterbody Map	Freshwater Lake	1,600.0	Acres	Impaired	TMDL completed
Little Prickly Pear Creek	MT41I005_051	Little Prickly Pear Creek, North And South Forks To Clark Creek	Waterbody Map	River	20.0	Miles	Impaired	TMDL needed
Little Prickly Pear Creek	MT41I005_052	Little Prickly Pear Creek, Clark Creek To The Mouth (Missouri River)	Waterbody Map	River	16.1	Miles	Impaired	TMDL needed
Lump Gulch	MT41I006_130	Lump Gulch, Headwaters To The Mouth (Prickly Pear Creek)	Waterbody Map	River	14.5	Miles	Impaired	TMDL needed
Magpie Creek	MT41I002_110	Magpie Creek (Gulch) From The Headwaters To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	12.7	Miles	Impaired	TMDL needed
Mcclellan Creek	MT41I006_200	Mcclellan Creek, Headwaters To Mouth (Prickly Pear Creek)	Waterbody Map	River	11.8	Miles	Not_Assessed
Middle Fork Warm Springs Creek	MT41I006_100	Middle Fork Warm Springs Creek, Headwaters To Mouth (Warm Springs Creek-Prickly Pear Creek)	Waterbody Map	River	2.7	Miles	Impaired	TMDL needed
Missouri River	MT41I001_011	Missouri River, Headwaters To Toston Dam	Waterbody Map	River	21.0	Miles	Impaired	TMDL needed
Missouri River	MT41I001_012	Missouri River, Toston Dam To Canyon Ferry Reservoir	Waterbody Map	River	24.4	Miles	Impaired	TMDL needed
Missouri River	MT41I004_010	Missouri River, Canyon Ferry Dam To Hauser Lake	Data Unavailable	River	3.8	Miles	Impaired	TMDL needed
Missouri River	MT41I004_020	Missouri River, Hauser Dam To Holter Reservoir	Waterbody Map	River	4.6	Miles	Good
Missouri River	MT41I004_030	Missouri River, Holter Dam To Little Prickly Pear Creek	Waterbody Map	River	2.9	Miles	Impaired	TMDL needed
North Fork Warm Springs Creek	MT41I006_180	North Fork Warm Springs Creek, Headwaters To Mouth (Warmsprings Creek-Prickly Pear)	Waterbody Map	River	3.5	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_010	Prickly Pear Creek, Lake Helena To Hauser Lake	Waterbody Map	River	4.1	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_020	Prickly Pear Creek, Helena Wwtp Discharge Ditch To Lake Helena	Waterbody Map	River	9.1	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_030	Prickly Pear Creek, Highway 433 (Wylie Dr.) Crossing To Helena Wwtp Discharge	Waterbody Map	River	6.1	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_040	Prickly Pear Creek, Lump Gulch To Montana Highway 433 (Wylie Dr.) Crossing	Waterbody Map	River	10.6	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_050	Prickly Pear Creek, Spring Creek To Lump Gulch	Waterbody Map	River	7.0	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_060	Prickly Pear Creek, Headwaters To Spring Creek	Waterbody Map	River	8.7	Miles	Impaired	TMDL needed
Sevenmile Creek	MT41I006_160	Sevenmile Creek, Headwaters To The Mouth (Tenmile Creek)	Waterbody Map	River	7.8	Miles	Impaired	TMDL needed
Sheep Creek	MT41I005_070	Sheep Creek, Headwaters To Mouth (Little Prickly Pear Creek)	Waterbody Map	Ephemeral Stream	5.9	Miles	Good
Silver Creek	MT41I006_150	Silver Creek, Headwaters To The Mouth (Lake Helena)	Waterbody Map	River	21.6	Miles	Impaired	TMDL needed
Sixteenmile Creek	MT41I002_120	Sixteenmile Creek, Lost Creek To The Mouth (Missouri River)	Waterbody Map	River	46.5	Miles	Impaired	TMDL needed
Skelly Gulch	MT41I006_220	Skelly Gulch Tributary Of Greenhorn Creek-Sevenmile Creek T10n R5w Sec 2	Waterbody Map	River	7.7	Miles	Impaired	TMDL needed
Spring Creek	MT41I006_080	Spring Creek, Corbin Creek To The Mouth (Prickly Pear Creek)	Waterbody Map	River	1.7	Miles	Impaired	TMDL needed
Tenmile Creek	MT41I006_141	Tenmile Creek, Headwaters To The Helena Pws Intake Above Rimini	Waterbody Map	River	6.0	Miles	Impaired	TMDL needed
Tenmile Creek	MT41I006_142	Tenmile Creek, The Helena Pws Intake Above Rimini To The Helena Wt Plant	Waterbody Map	River	7.7	Miles	Impaired	TMDL completed
Tenmile Creek	MT41I006_143	Tenmile Creek, The Helena Wt Plant To The Mouth (Prickly Pear Creek)	Waterbody Map	River	15.9	Miles	Impaired	TMDL needed
Trout Creek	MT41I005_020	Trout Creek, Headwaters To The Mouth (Hauser Lake)	Waterbody Map	River	20.1	Miles	Impaired	TMDL needed
Virginia Creek	MT41I005_040	Virginia Creek, Headwaters To The Mouth (Canyon Creek)	Waterbody Map	River	8.2	Miles	Impaired	TMDL needed
Warm Springs Creek	MT41I006_110	Warm Springs Creek, The Middle Fork To The Mouth (Prickly Pear Creek)	Waterbody Map	River	3.0	Miles	Impaired	TMDL completed
White Gulch	MT41I002_130	White Gulch, Headwaters To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	13.2	Miles	Impaired	TMDL needed
Wilson Creek	MT41I002_140	Wilson Creek 3.3 Miles Above The Mouth To The Mouth (Crow Creek)	Waterbody Map	River	3.3	Miles	Impaired	TMDL needed
Woodsiding Gulch	MT41I005_080	Woodsiding Gulch Headwaters To Mouth (Little Prickly Pear Creek) T13n R4w Sec 33	Waterbody Map	River	2.2	Miles	Impaired	TMDL needed

Description of this table
Click here to list All Assessed Waters

Waterbody Name	Waterbody ID	Location	Map	Waterbody Type	Size	Units	Status	State TMDL Development Status
NOTE: Click on the underlined "Waterbody Name" to view a Waterbody report.
Avalanche Creek	MT41I002_010	Avalanche Gulch, Headwaters To Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	16.5	Miles	Impaired	Non-pollutant impairment
Battle Creek	MT41I002_020	Battle Creek, Headwaters To The Mouth (Sixteenmile Creek-Missouri River)	Waterbody Map	River	20.4	Miles	Impaired	TMDL needed
Beaver Creek	MT41I002_030	Beaver Creek, Headwaters To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	14.4	Miles	Impaired	TMDL needed
Beaver Creek	MT41I005_011	Beaver Creek, Headwaters To Nelson	Waterbody Map	River	13.3	Miles	Impaired	TMDL needed
Beaver Creek	MT41I005_012	Beaver Creek, Nelson To The Mouth (Missouri River Below Hauser Dam)	Waterbody Map	River	5.3	Miles	Impaired	TMDL needed
Canyon Ferry Reservoir	MT41I003_010	Canyon Ferry Reservoir	Waterbody Map	Freshwater Lake	35,180.0	Acres	Impaired	TMDL needed
Cave Gulch	MT41I002_150	Cave Gulch, Headwaters To Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	6.4	Miles	Impaired	TMDL needed
Clancy Creek	MT41I006_120	Clancy Creek, Headwaters To The Mouth (Prickly Pear Creek)	Waterbody Map	River	11.6	Miles	Impaired	TMDL needed
Confederate Gulch	MT41I002_041	Confederate Gulch, Headwaters To Hunter Gulch	Waterbody Map	River	9.8	Miles	Impaired	TMDL needed
Confederate Gulch	MT41I002_042	Confederate Gulch, Hunter Gulch To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	5.1	Miles	Impaired	TMDL needed
Corbin Creek	MT41I006_090	Corbin Creek, Headwaters To The Mouth (Spring Creek)	Waterbody Map	River	2.5	Miles	Impaired	TMDL needed
Crow Creek	MT41I002_050	Crow Creek, The National Forest Boundary To The Mouth (Missouri River)	Waterbody Map	River	16.8	Miles	Impaired	TMDL needed
Crow Creek	MT41I002_060	Crow Creek, Crow Creek Falls To The National Forest Boundary	Waterbody Map	River	7.9	Miles	Impaired	TMDL needed
Deep Creek	MT41I002_070	Deep Creek, The National Forest Boundary To The Mouth (Missouri River)	Waterbody Map	River	18.1	Miles	Impaired	TMDL completed
Dry Creek	MT41I002_080	Dry Creek, Headwaters To The Mouth (Missouri River)	Waterbody Map	River	16.7	Miles	Impaired	TMDL needed
East Fork Indian Creek	MT41I002_170	East Fork Indian Creek, Headwaters To Mouth (Indian Creek)	Waterbody Map	River	4.7	Miles	Impaired	TMDL needed
Falls Gulch	MT41I005_030	Falls Gulch, Headwaters To Mouth (Holter Lake) T14n, R3w, Sec. 29	Waterbody Map	River	3.3	Miles	Impaired	TMDL needed
Fool Hen Creek	MT41I005_060	Fool Hen Creek, Headwaters To Mouth (Virgina Creek-Canyon Creek- Little Prickly Pear Creek)	Waterbody Map	River	1.7	Miles	Impaired	TMDL needed
Golconda Creek	MT41I006_070	Golconda Creek, Headwaters To The Mouth (Prickly Pear Creek) T 7n, R3w	Waterbody Map	River	3.7	Miles	Impaired	TMDL needed
Granite Creek	MT41I006_230	Granite Creek, Headwaters To The Mouth (Sevenmile Creek)	Waterbody Map	River	2.0	Miles	Impaired	TMDL needed
Hauser Lake	MT41I007_040	Hauser Lake	Waterbody Map	Freshwater Lake	3,800.0	Acres	Impaired	TMDL needed
Hellgate Gulch	MT41I002_090	Hellgate Gulch, Headwaters To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	11.5	Miles	Impaired	TMDL needed
Holter Lake	MT41I007_020	Holter Lake (Missouri River Mainstem Reservoir.)	Waterbody Map	Freshwater Lake	5,500.0	Acres	Impaired	TMDL needed
Indian Creek	MT41I002_100	Indian Creek, Headwaters To The Mouty (Missouri River)	Waterbody Map	River	7.9	Miles	Impaired	TMDL needed
Jackson Creek	MT41I006_190	Jackson Creek, Headwaters To Mouth (Mcclellan Creek-Prickly Pear Creek)	Waterbody Map	River	2.5	Miles	Impaired	TMDL needed
Jennies Fork	MT41I006_210	Jennies Fork, Headwaters To Mouth (Silver Creek-Missouri River)	Waterbody Map	River	1.2	Miles	Impaired	TMDL needed
Lake Helena	MT41I007_010	Lake Helena	Waterbody Map	Freshwater Lake	1,600.0	Acres	Impaired	TMDL completed
Little Prickly Pear Creek	MT41I005_051	Little Prickly Pear Creek, North And South Forks To Clark Creek	Waterbody Map	River	20.0	Miles	Impaired	TMDL needed
Little Prickly Pear Creek	MT41I005_052	Little Prickly Pear Creek, Clark Creek To The Mouth (Missouri River)	Waterbody Map	River	16.1	Miles	Impaired	TMDL needed
Lump Gulch	MT41I006_130	Lump Gulch, Headwaters To The Mouth (Prickly Pear Creek)	Waterbody Map	River	14.5	Miles	Impaired	TMDL needed
Magpie Creek	MT41I002_110	Magpie Creek (Gulch) From The Headwaters To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	12.7	Miles	Impaired	TMDL needed
Middle Fork Warm Springs Creek	MT41I006_100	Middle Fork Warm Springs Creek, Headwaters To Mouth (Warm Springs Creek-Prickly Pear Creek)	Waterbody Map	River	2.7	Miles	Impaired	TMDL needed
Missouri River	MT41I001_011	Missouri River, Headwaters To Toston Dam	Waterbody Map	River	21.0	Miles	Impaired	TMDL needed
Missouri River	MT41I001_012	Missouri River, Toston Dam To Canyon Ferry Reservoir	Waterbody Map	River	24.4	Miles	Impaired	TMDL needed
Missouri River	MT41I004_010	Missouri River, Canyon Ferry Dam To Hauser Lake	Data Unavailable	River	3.8	Miles	Impaired	TMDL needed
Missouri River	MT41I004_030	Missouri River, Holter Dam To Little Prickly Pear Creek	Waterbody Map	River	2.9	Miles	Impaired	TMDL needed
North Fork Warm Springs Creek	MT41I006_180	North Fork Warm Springs Creek, Headwaters To Mouth (Warmsprings Creek-Prickly Pear)	Waterbody Map	River	3.5	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_010	Prickly Pear Creek, Lake Helena To Hauser Lake	Waterbody Map	River	4.1	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_020	Prickly Pear Creek, Helena Wwtp Discharge Ditch To Lake Helena	Waterbody Map	River	9.1	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_030	Prickly Pear Creek, Highway 433 (Wylie Dr.) Crossing To Helena Wwtp Discharge	Waterbody Map	River	6.1	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_040	Prickly Pear Creek, Lump Gulch To Montana Highway 433 (Wylie Dr.) Crossing	Waterbody Map	River	10.6	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_050	Prickly Pear Creek, Spring Creek To Lump Gulch	Waterbody Map	River	7.0	Miles	Impaired	TMDL needed
Prickly Pear Creek	MT41I006_060	Prickly Pear Creek, Headwaters To Spring Creek	Waterbody Map	River	8.7	Miles	Impaired	TMDL needed
Sevenmile Creek	MT41I006_160	Sevenmile Creek, Headwaters To The Mouth (Tenmile Creek)	Waterbody Map	River	7.8	Miles	Impaired	TMDL needed
Silver Creek	MT41I006_150	Silver Creek, Headwaters To The Mouth (Lake Helena)	Waterbody Map	River	21.6	Miles	Impaired	TMDL needed
Sixteenmile Creek	MT41I002_120	Sixteenmile Creek, Lost Creek To The Mouth (Missouri River)	Waterbody Map	River	46.5	Miles	Impaired	TMDL needed
Skelly Gulch	MT41I006_220	Skelly Gulch Tributary Of Greenhorn Creek-Sevenmile Creek T10n R5w Sec 2	Waterbody Map	River	7.7	Miles	Impaired	TMDL needed
Spring Creek	MT41I006_080	Spring Creek, Corbin Creek To The Mouth (Prickly Pear Creek)	Waterbody Map	River	1.7	Miles	Impaired	TMDL needed
Tenmile Creek	MT41I006_141	Tenmile Creek, Headwaters To The Helena Pws Intake Above Rimini	Waterbody Map	River	6.0	Miles	Impaired	TMDL needed
Tenmile Creek	MT41I006_142	Tenmile Creek, The Helena Pws Intake Above Rimini To The Helena Wt Plant	Waterbody Map	River	7.7	Miles	Impaired	TMDL completed
Tenmile Creek	MT41I006_143	Tenmile Creek, The Helena Wt Plant To The Mouth (Prickly Pear Creek)	Waterbody Map	River	15.9	Miles	Impaired	TMDL needed
Trout Creek	MT41I005_020	Trout Creek, Headwaters To The Mouth (Hauser Lake)	Waterbody Map	River	20.1	Miles	Impaired	TMDL needed
Virginia Creek	MT41I005_040	Virginia Creek, Headwaters To The Mouth (Canyon Creek)	Waterbody Map	River	8.2	Miles	Impaired	TMDL needed
Warm Springs Creek	MT41I006_110	Warm Springs Creek, The Middle Fork To The Mouth (Prickly Pear Creek)	Waterbody Map	River	3.0	Miles	Impaired	TMDL completed
White Gulch	MT41I002_130	White Gulch, Headwaters To The Mouth (Canyon Ferry Reservoir)	Waterbody Map	River	13.2	Miles	Impaired	TMDL needed
Wilson Creek	MT41I002_140	Wilson Creek 3.3 Miles Above The Mouth To The Mouth (Crow Creek)	Waterbody Map	River	3.3	Miles	Impaired	TMDL needed
Woodsiding Gulch	MT41I005_080	Woodsiding Gulch Headwaters To Mouth (Little Prickly Pear Creek) T13n R4w Sec 33	Waterbody Map	River	2.2	Miles	Impaired	TMDL needed

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Causes of Impairment for Reporting Year 2008

Montana, Upper Missouri

Description of this table

Cause of Impairment	Size of Assessed Waters with Listed Causes of Impairment
NOTE: Click on the underlined "Cause of Impairment" value to see a listing of those waters with that cause of impairment.
Cause of Impairment	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Aluminum	12.3
Antimony	10.6
Endosulfan		3,800.0
Low Flow Alterations	236.5
Physical Substrate Habitat Alterations	130.4
Cadmium	179.2
Chromium, Total	14.4
pH	2.5
Thallium		35,180.0
Chlorophyll-A	13.3
DDT		3,800.0
Other Flow Regime Alterations	48.8
Zinc	138.5
Arsenic	164.2	36,780.0
DDE	21.6
Excess Algal Growth		35,180.0
Lead	189.0	1,600.0
Nutrient/Eutrophication Biological Indicators	15.9
Phosphorus, Total	177.0	1,600.0
Copper	149.1
Nitrate/Nitrite (Nitrite + Nitrate as N)	24.7
Nitrates	14.9
Nitrogen, Nitrate	3.8
Ammonia, Un-ionized	15.2	35,180.0
Dissolved Oxygen	3.8	3,800.0
Endrin Aldehyde		3,800.0
Silver	20.3
Nitrogen, Total	69.3	1,600.0
Organic Enrichment (Sewage) Biological Indicators	3.5
Other Anthropogenic Substrate Alterations	48.2
Solids (Suspended/Bedload)	2.5
Temperature, Water	90.9
Total Suspended Solids (TSS)	24.9
Alteration in Stream-Side or Littoral Vegetative Covers	346.4
Mercury	106.4	9,300.0
Sedimentation/Siltation	357.7
Total Kjehldahl Nitrogen (TKN)	81.8

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Probable Sources Contributing to Impairments for Reporting Year 2008

Montana, Upper Missouri Watershed

Description of this table

Probable Source	Size of Assessed Waters with Probable Sources of Impairments
Probable Source	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Acid Mine Drainage	117.6	36,780.0
Agriculture	163.0	38,980.0
Animal Feeding Operations (Nps)	11.6
Atmospheric Deposition - Toxics	4.1	5,500.0
Channelization	122.7
Contaminated Sediments	43.2
Dam Construction (Other Than Upstream Flood Control Projects)	3.8
Dam Or Impoundment	2.5
Dredge Mining	44.4
Flow Alterations From Water Diversions	63.3
Forest Roads (Road Construction And Use)	72.1
Grazing In Riparian Or Shoreline Zones	264.7
Habitat Modification - Other Than Hydromodification	38.8
Highway/Road/Bridge Runoff (Non-Construction Related)	35.0	3,800.0
Highways, Roads, Bridges, Infrastructure (New Construction)	72.6
Historic Bottom Deposits (Not Sediment)		5,500.0
Impacts From Abandoned Mine Lands (Inactive)	234.6	42,280.0
Impacts From Hydrostructure Flow Regulation/Modification	23.6	5,400.0
Inappropriate Waste Disposal		5,500.0
Industrial Point Source Discharge	25.8
Internal Nutrient Recycling		35,180.0
Irrigated Crop Production	197.4	1,600.0
Loss Of Riparian Habitat	74.3
Mill Tailings	25.8
Mine Tailings	50.1
Municipal Point Source Discharges	36.8	36,780.0
Natural Sources	43.9	40,580.0
Non-Irrigated Crop Production	21.0
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems)	12.8	35,180.0
Other Recreational Pollution Sources	11.5
Placer Mining	53.0	5,500.0
Rangeland Grazing		1,600.0
Silviculture Activities	31.5	3,800.0
Site Clearance (Land Development Or Redevelopment)	15.9	35,180.0
Source Unknown	11.4	9,300.0
Streambank Modifications/Destabilization	41.6
Subsurface (Hardrock) Mining	28.2
Unspecified Unpaved Road Or Trail	51.5
Upstream Impoundments (E.G., Pl-566 Nrcs Structures)	2.9

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TMDL Alternatives by Cause of Impairment for Reporting Year 2008

Montana, Upper Missouri Watershed

No TMDL Alternatives reported.

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Cumulative TMDLs by Pollutant

Montana, Upper Missouri Watershed

This chart includes TMDLs since October 1, 1995.

Description of this table

Pollutant	Number of TMDLs Completed	Number of Causes of Impairment Addressed
NOTE: Click on the underlined "Number of TMDLs Completed" value to see a listing of those approved TMDLs for the pollutant.
Lead	19	19
Cadmium	17	17
Arsenic	15	15
Sediment	14	14
Zinc	14	14
Copper	11	11
Nitrogen, Total	6	6
Phosphorus, Total	6	7
Total Suspended Solids (TSS)	3	3
Thermal Modifications	1	1

Total: 106 TMDLs; 0 Causes of Impairment

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Montana, Upper Missouri Watershed

Features

Assessment Summary for Reporting Year 2008Montana, Upper Missouri Watershed

Causes of Impairment for Reporting Year 2008

Montana, Upper Missouri

Probable Sources Contributing to Impairments for Reporting Year 2008

Montana, Upper Missouri Watershed

TMDL Alternatives by Cause of Impairment for Reporting Year 2008

Montana, Upper Missouri Watershed

Cumulative TMDLs by Pollutant

Montana, Upper Missouri Watershed

Assessment Summary for Reporting Year 2008
Montana, Upper Missouri Watershed