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On This Page
- Assessment Summary
- Causes of Impairment
- Probable Sources Contributing to Impairment
- TMDL Alternatives by Cause of Impairment
- Cumulative TMDLs by Pollutant
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Montana, Upper Missouri-Dearborn Watershed
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Assessment Summary for Reporting Year 2008
Montana, Upper Missouri-Dearborn Watershed
Description of this table
Click here to list Threatened and Impaired Waters Only
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 |
|---|---|---|---|---|---|---|---|---|
| Benton Lake | MT41Q005_020 | Benton Lake T22n R3e | Waterbody Map | Freshwater Lake | 5,600.0 | Acres | Impaired | TMDL needed |
| Box Elder Creek | MT41Q002_050 | Box Elder Creek, Spring Creek To Mouth (Missouri River) | Waterbody Map | River | 15.9 | Miles | Impaired | TMDL needed |
| Cottonwood Creek | MT41Q002_020 | Cottonwood Creek, 1 Mile Above Stockett To Mouth (Sand Coulee Creek-Missouri River) | Waterbody Map | River | 3.9 | Miles | Impaired | TMDL needed |
| Dearborn River | MT41Q003_010 | Dearborn River, Falls Creek To The Mouth (Missouri River) | Waterbody Map | River | 48.6 | Miles | Impaired | TMDL needed |
| Dearborn River, Middle Fork | MT41Q003_020 | Middle Fork Of The Dearborn River, Headwaters To The Mouth (Dearborn River) | Waterbody Map | River | 13.5 | Miles | Impaired | TMDL completed |
| Dearborn River, South Fork | MT41Q003_030 | South Fork Of The Dearborn River, Headwaters To The Mouth (Dearborn River) | Waterbody Map | River | 15.8 | Miles | Impaired | TMDL completed |
| Flat Creek | MT41Q003_040 | Flat Creek, Henry Creek To The Mouth (Dearborn River) | Waterbody Map | River | 15.5 | Miles | Impaired | TMDL completed |
| Lake Creek | MT41Q002_010 | Lake Creek, Headwaters To The Mouth (Benton Lake) | Waterbody Map | River | 19.6 | Miles | Impaired | TMDL needed |
| Missouri River | MT41Q001_011 | Missouri River, Sun River To Rainbow Dam | Waterbody Map | River | 7.6 | Miles | Impaired | TMDL needed |
| Missouri River | MT41Q001_013 | Missouri River, Rainbow Dam To The Morony Dam | Waterbody Map | River | 10.2 | Miles | Impaired | TMDL needed |
| Missouri River | MT41Q001_014 | Missouri River, Morony Dam To The Marias River | Waterbody Map | River | 60.6 | Miles | Impaired | TMDL needed |
| Missouri River | MT41Q001_021 | Missouri River, Little Prickly Pear Creek To Sheep Creek | Waterbody Map | River | 21.3 | Miles | Impaired | TMDL needed |
| Missouri River | MT41Q001_022 | Missouri River, Sheep Creek To The Sun River | Waterbody Map | River | 65.6 | Miles | Impaired | TMDL needed |
| Number Five Coulee | MT41Q002_030 | Number Five Coulee, Headwaters To The Mouth (Cottonwood Creek-Sand Coulee Creek-Missouri River) | Waterbody Map | River | 15.1 | Miles | Impaired | TMDL needed |
| Sand Coulee | MT41Q002_060 | Sand Coulee From Headwaters To Mouth Sand Coulee Creek-Missouri River) | Waterbody Map | River | 5.3 | Miles | Impaired | TMDL needed |
| Sand Coulee Creek | MT41Q002_040 | Sand Coulee Creek, Number Five Coulee To The Mouth (Missouri River) | Waterbody Map | River | 17.1 | Miles | Impaired | TMDL needed |
| Stickney Creek, South Fork | MT41Q002_070 | South Fork Stickney Creek, Headwaters To The Mouth (Stickney Creek-Missouri River) | Waterbody Map | River | 14.1 | Miles | Good | |
Causes of Impairment for Reporting Year 2008
Montana, Upper Missouri-Dearborn
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) |
||||||||||||||
| Aluminum | 81.0 | ||||||||||||||
| Low Flow Alterations | 15.8 | ||||||||||||||
| Physical Substrate Habitat Alterations | 7.6 | ||||||||||||||
| Cadmium | 104.5 | ||||||||||||||
| Chromium, Total | 7.6 | ||||||||||||||
| Salinity | 42.0 | 5,600.0 | |||||||||||||
| Sulfates | 5,600.0 | ||||||||||||||
| Chlorophyll-A | 60.6 | ||||||||||||||
| Other Flow Regime Alterations | 40.9 | ||||||||||||||
| Turbidity | 17.8 | ||||||||||||||
| Zinc | 121.6 | ||||||||||||||
| Arsenic | 92.1 | ||||||||||||||
| Excess Algal Growth | 5,600.0 | ||||||||||||||
| Lead | 92.8 | ||||||||||||||
| Nickel | 24.3 | ||||||||||||||
| Phosphorus, Total | 60.6 | ||||||||||||||
| Copper | 70.8 | ||||||||||||||
| Nitrate/Nitrite (Nitrite + Nitrate as N) | 15.9 | ||||||||||||||
| High Flow Regime | 15.5 | ||||||||||||||
| Iron | 60.6 | ||||||||||||||
| Nitrogen, Total | 81.9 | 5,600.0 | |||||||||||||
| Selenium | 27.2 | 5,600.0 | |||||||||||||
| Solids (Suspended/Bedload) | 7.6 | ||||||||||||||
| Temperature, Water | 58.8 | ||||||||||||||
| Mercury | 7.6 | ||||||||||||||
| Pentachlorobenzene | 17.8 | ||||||||||||||
| Sedimentation/Siltation | 245.6 | ||||||||||||||
Probable Sources Contributing to Impairments for Reporting Year 2008
Montana, Upper Missouri-Dearborn 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) |
||||||||||||||
| Acid Mine Drainage | 3.9 | ||||||||||||||
| Agriculture | 162.9 | 5,600.0 | |||||||||||||
| Contaminated Sediments | 17.8 | ||||||||||||||
| Dam Construction (Other Than Upstream Flood Control Projects) | 73.2 | ||||||||||||||
| Dam Or Impoundment | 70.8 | ||||||||||||||
| Flow Alterations From Water Diversions | 31.3 | ||||||||||||||
| Grazing In Riparian Or Shoreline Zones | 82.0 | ||||||||||||||
| Habitat Modification - Other Than Hydromodification | 44.8 | ||||||||||||||
| Highway/Road/Bridge Runoff (Non-Construction Related) | 65.6 | ||||||||||||||
| Impacts From Abandoned Mine Lands (Inactive) | 47.7 | ||||||||||||||
| Impacts From Hydrostructure Flow Regulation/Modification | 155.1 | ||||||||||||||
| Industrial Point Source Discharge | 78.4 | ||||||||||||||
| Industrial/Commercial Site Stormwater Discharge (Permitted) | 7.6 | ||||||||||||||
| Irrigated Crop Production | 48.5 | 5,600.0 | |||||||||||||
| Natural Sources | 97.1 | ||||||||||||||
| Post-Development Erosion And Sedimentation | 10.2 | ||||||||||||||
| Streambank Modifications/Destabilization | 126.2 | ||||||||||||||
| Subsurface (Hardrock) Mining | 41.4 | ||||||||||||||
TMDL Alternatives by Cause of Impairment for Reporting Year 2008
Montana, Upper Missouri-Dearborn Watershed
No TMDL Alternatives reported.
Cumulative TMDLs by Pollutant
Montana, Upper Missouri-Dearborn 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 |
|---|---|---|
| Aluminum |  3 |
3 |
| Cadmium | 3 |
3 |
| Iron | 3 |
3 |
| Nickel | 3 |
3 |
| Sediment | 3 |
3 |
| Zinc | 3 |
4 |
| Copper | 1 |
1 |
| Fecal Coliform | 1 |
1 |
Total: 20 TMDLs; 0 Causes of Impairment
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