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Assessment Data for the State of Montana Year 2002
|
Impaired Water Information
Other Water Assessment Information
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State of Montana websites: | State 305(b) Water Quality Assessment Report(s) |
| State Water Quality Program |
Search for a Waterbody within Montana
Total Assessed Waters for the State of Montana
Description of this table| Size Of Water | ||||||||
|---|---|---|---|---|---|---|---|---|
| Rivers, Streams, Creeks (Miles) | Lakes, Ponds, Reservoir (Acres) | Bays, Estuaries (Square Miles) | Coastal Shorelines (Miles) | Oceans, Near Coastal Waters (Square Miles) | Wetlands (Acres) | Great Lakes Shoreline (Miles) | Great Lakes Open Water (Square Miles) | |
| Total Assessed Waters | 12,727.09 | 548,228.70 | .00 | .00 | .00 | .00 | .00 | .00 |
| Estimated Total Water Size in MT | 176,750.00 | 844,802.00 | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable |
| Percent of Waters Assessed | 7.20 | 64.89 | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable |
Assessed Waters of Montana by Watershed
Description of this table| Watershed | Size of Water | |||||||
|---|---|---|---|---|---|---|---|---|
| Rivers, Streams, Creeks (Miles) | Lakes, Ponds, Reservoir (Acres) | Bays, Estuaries (Square Miles) | Coastal Shorelines (Miles) | Oceans, Near Coastal Waters (Square Miles) | Wetlands (Acres) | Great Lakes Shoreline (Miles) | Great Lakes Open Water (Square Miles) | |
| BATTLE | 70.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BEAVER | 120.00 | 80.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BEAVER | 135.30 | 3,500.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BEAVERHEAD | 175.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BELT | 136.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG DRY | 96.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG HOLE | 647.00 | 98.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG HORN LAKE | 14.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG MUDDY | 194.80 | 1,280.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG SANDY | 37.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BITTERROOT | 542.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BLACKFOOT | 498.20 | 2,013.30 | .00 | .00 | .00 | .00 | .00 | .00 |
| BOULDER | 194.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BOX ELDER | 9.20 | 3,040.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BOXELDER | 55.20 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BULLWHACKER-DOG | 103.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CHARLIE-LITTLE MUDDY | 94.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CLARKS FORK YELLOWSTONE | 131.00 | 10.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FISHER | 69.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FLATHEAD LAKE | 27.60 | 127,526.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| FLATWILLOW | 164.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FLINT-ROCK | 132.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FORT PECK RESERVOIR | 231.60 | 245,000.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| GALLATIN | 272.50 | 250.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| JEFFERSON | 265.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| JUDITH | 240.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LITTLE DRY | 96.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER BIGHORN | 103.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER CLARK FORK | 315.80 | 8,800.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER FLATHEAD | 4.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER KOOTENAI | 6.20 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER MILK | 254.30 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER MUSSELSHELL | 196.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER TONGUE | 168.30 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER YELLOWSTONE | 230.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER YELLOWSTONE-SUNDAY | 146.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MADISON | 351.10 | 3,780.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| MARIAS | 279.39 | 17,500.10 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE CLARK FORK | 377.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE FORK FLATHEAD | 32.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE MILK | 270.40 | 3,901.70 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE MUSSELSHELL | 114.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIZPAH | 149.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NORTH FORK FLATHEAD | 94.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| O'FALLON | 61.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PEOPLES | .70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PORCUPINE | 45.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PRARIE ELK-WOLF | 144.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RED ROCK | 169.60 | 3,332.10 | .00 | .00 | .00 | .00 | .00 | .00 |
| REDWATER | 194.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ROSEBUD | 109.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RUBY | 236.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAGE | 128.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SHIELDS | 107.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SMITH | 225.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SOUTH FORK FLATHEAD | 43.00 | 21,999.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ST. MARY | 10.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| STILLWATER | 90.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| STILLWATER | 148.30 | 3,349.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| SUN | 148.40 | 3,500.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SWAN | 50.50 | 2,680.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TETON | 281.10 | 300.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TWO MEDICINE | 44.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER CLARK FORK | 674.30 | 3,675.10 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER KOOTENAI | 240.70 | 28,850.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER LITTLE MISSOURI | 162.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER MILK | 21.30 | 4,000.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER MISSOURI | 373.00 | 46,080.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER MISSOURI-DEARBORN | 319.70 | 5,600.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER MUSSELSHELL | 200.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER TONGUE | 57.70 | 3,500.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER YELLOWSTONE | 334.30 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER YELLOWSTONE-LAKE BASIN | 105.40 | 3,897.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER YELLOWSTONE-POMPEYS PILLAR | 10.00 | 675.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| WILLOW | 117.60 | 9.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| YAAK | 71.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| Name Not Reported | 73.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
Montana Assessed Waters
Individual Use Support for Rivers and Streams
Description of this table
| State Designated Use | Total Miles Assessed | Percent Good | Percent Threatened | Percent Impaired |  % Good |
|
|---|---|---|---|---|---|---|
 % Threatened |
||||||
 % Impaired |
||||||
 |
Fish, Shellfish, and Wildlife Protection and Propagation | 10,412.19 | 16.83 | .08 | 83.09 | |
 |
Recreation | 8,228.79 | 56.29 | 1.65 | 42.06 | |
 |
Public Water Supply | 6,845.30 | 58.91 | .00 | 41.09 | |
 |
Agricultural | 9,119.09 | 91.10 | .00 | 8.90 | |
 |
Industrial | 9,101.79 | 90.38 | .00 | 9.62 | |
Montana Assessed Waters
Water Quality Attainment for Rivers and Streams
Description of this table
| Attainment Status | Miles | Percent of Assessed |
| Good | 3,038.50 | 23.87 |
| Threatened | 8.10 | .06 |
| Impaired | 9,680.49 | 76.06 |
| Total Miles Assessed | 12,727.09 | 100.00 |
Montana Top Causes of Impairments
for Rivers and Streams
Description of this table
| # | State Cause Name | Total Miles Impaired |
|---|---|---|
| 1 | OTHER HABITAT ALTERATIONS | 6,416.80 |
| 2 | FLOW ALTERATION | 4,153.19 |
| 3 | SEDIMENTATION/SILTATION | 3,723.10 |
| 4 | RIPARIAN DEGRADATION | 3,198.70 |
| 5 | NUTRIENTS | 2,653.30 |
| 6 | DEWATERING | 1,948.70 |
| 7 | BANK EROSION | 1,829.40 |
| 8 | FISH HABITAT DEGRADATION | 1,515.60 |
| 9 | TEMPERATURE, WATER | 1,462.79 |
| 10 | MERCURY | 1,291.99 |
Montana Top Probable Sources of Impairments
for Rivers and Streams
Description of this table
| # | State Source Name | Total Miles Impaired by Source |
|---|---|---|
| 1 | AGRICULTURE | 6,676.20 |
| 2 | LIVESTOCK (GRAZING OR FEEDING OPERATIONS) | 5,221.80 |
| 3 | CROP PRODUCTION (CROP LAND OR DRY LAND) | 3,330.80 |
| 4 | HYDROMODIFICATION | 2,764.19 |
| 5 | HABITAT MODIFICATION (OTHER THAN HYDROMODIFICATION) | 2,507.00 |
| 6 | FLOW ALTERATIONS FROM WATER DIVERSIONS | 2,254.09 |
| 7 | ABANDONED MINING | 1,896.40 |
| 8 | CHANNELIZATION | 1,392.90 |
| 9 | STREAMBANK MODIFICATIONS/DESTABLIZATION | 1,296.20 |
| 10 | LOSS OF RIPARIAN HABITAT | 1,263.10 |
Montana Assessed Waters
Individual Use Support for Lakes, Ponds and Reservoirs
Description of this table
| State Designated Use | Total Acres Assessed | Percent Good | Percent Threatened | Percent Impaired | % Good |
|
|---|---|---|---|---|---|---|
| % Threatened |
||||||
| % Impaired |
||||||
|
Fish, Shellfish, and Wildlife Protection and Propagation | 283,163.00 | 28.56 | 2.67 | 68.78 | |
|
Recreation | 514,422.00 | 39.22 | .00 | 60.78 | |
|
Public Water Supply | 477,804.30 | 36.64 | .00 | 63.36 | |
|
Industrial | 294,153.80 | 97.49 | .00 | 2.51 | |
|
Agricultural | 285,528.80 | 81.66 | .00 | 18.34 | |
Montana Assessed Waters
Water Quality Attainment for Lakes, Ponds and Reservoirs
Description of this table
| Attainment Status | Acres | Percent of Assessed |
| Good | 58,646.30 | 10.70 |
| Threatened | 4,200.00 | .77 |
| Impaired | 485,382.40 | 88.54 |
| Total Acres Assessed | 548,228.70 | 100.00 |
Montana Top Causes of Impairments
for Lakes, Ponds and Reservoirs
Description of this table
| # | State Cause Name | Total Acres Impaired |
|---|---|---|
| 1 | MERCURY | 418,836.80 |
| 2 | NON-NATIVE AQUATIC PLANTS | 289,280.00 |
| 3 | LEAD | 246,600.00 |
| 4 | NUTRIENTS | 174,188.60 |
| 5 | SEDIMENTATION/SILTATION | 135,368.90 |
| 6 | SUSPENDED ALGAE | 131,026.90 |
| 7 | ORGANIC ENRICHMENT/LOW DO | 129,806.90 |
| 8 | POLYCHLORINATED BIPHENYLS | 129,356.80 |
| 9 | FLOW ALTERATION | 43,873.60 |
| 10 | ARSENIC | 36,789.00 |
Montana Top Probable Sources of Impairments
for Lakes, Ponds and Reservoirs
Description of this table
| # | State Source Name | Total Acres Impaired by Source |
|---|---|---|
| 1 | ATMOSPHERIC DEPOSITON - TOXICS | 376,506.90 |
| 2 | AGRICULTURE | 315,385.80 |
| 3 | ABANDONED MINING | 291,080.80 |
| 4 | HISTORIC BOTTOM DEPOSITS (NOT SEDIMENT) | 250,500.00 |
| 5 | HYDROMODIFICATION | 175,439.40 |
| 6 | MUNICIPAL POINT SOURCE DISCHARGES | 161,186.90 |
| 7 | FLOW ALTERATIONS FROM WATER DIVERSIONS | 143,089.40 |
| 8 | SOURCE UNKNOWN | 138,656.80 |
| 9 | SILVICULTURE | 137,356.80 |
| 10 | UPSTREAM IMPOUNDMENTS (E.G., PL-566 NRCS STRUCTURES) | 126,006.90 |
Montana
Causes of Impairment
Description of this table| State Cause Name | Size of Assessed Waters with Listed Causes of Impairment | |||||||
|---|---|---|---|---|---|---|---|---|
| Rivers, Streams, Creeks (Miles) | Lakes, Ponds, Reservoir (Acres) | Bays, Estuaries (Square Miles) | Coastal Shorelines (Miles) | Oceans, Near Coastal Waters (Square Miles) | Wetlands (Acres) | Great Lakes Shoreline (Miles) | Great Lakes Open Waters (Squar Miles) | |
| ZINC | 614.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| OTHER | 138.80 | 3,860.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| ARSENIC | 391.20 | 36,789.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PRIORITY ORGANICS | 45.30 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TOTAL SUSPENDED SOLIDS (TSS) | 367.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| METALS | 1,100.00 | 3,800.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| NITRATES | 280.30 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PATHOGENS | 433.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SUSPENDED ALGAE | 339.50 | 131,026.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| SULFATES | 19.00 | 9,100.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| AMMONIA (UNIONIZED) - TOXIN | 105.20 | 35,180.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LEAD | 1,084.50 | 246,600.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CHROMIUM (TOTAL) | .70 | 3,780.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| TEMPERATURE, WATER | 1,462.79 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FISH HABITAT DEGRADATION | 1,515.60 | 3,780.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| ORGANIC ENRICHMENT/LOW DO | 198.60 | 129,806.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| POLYCHLORINATED BIPHENYLS | 70.20 | 129,356.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| MERCURY | 1,291.99 | 418,836.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| TOTAL TOXICS | 29.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CADMIUM | 533.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SELENIUM | 77.80 | 13,575.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RADIATION | 81.30 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| OIL AND GREASE | 23.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FLOW ALTERATION | 4,153.19 | 43,873.60 | .00 | .00 | .00 | .00 | .00 | .00 |
| NONPRIORITY ORGANICS | 8.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SALINITY/TDS/SULFATES | 596.50 | 4,572.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NUTRIENTS | 2,653.30 | 174,188.60 | .00 | .00 | .00 | .00 | .00 | .00 |
| DEWATERING | 1,948.70 | 3,780.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| WATER LEVEL FLUCT | .00 | 36,083.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| CHANNEL INCISEMENT | 338.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RIPARIAN DEGRADATION | 3,198.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PHOSPHORUS, ELEMENTAL | 398.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SEDIMENTATION/SILTATION | 3,723.10 | 135,368.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| NON-NATIVE AQUATIC PLANTS | 13.00 | 289,280.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PH | 105.50 | 20.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| COPPER | 1,095.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SALINITY | 129.00 | 3,500.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TURBIDITY | 108.30 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PESTICIDES | .00 | 3,800.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BANK EROSION | 1,829.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| OTHER HABITAT ALTERATIONS | 6,416.80 | 8,464.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| NITROGEN, AMMONIA (TOTAL AMMONIA) | 174.90 | 5,600.00 | .00 | .00 | .00 | .00 | .00 | .00 |
Montana
Probable Sources Contributing to Impairment
Description of this table| State Source Name | Size of Assessed Waters with Probable Sources of Impairment | |||||||
|---|---|---|---|---|---|---|---|---|
| Rivers, Streams, Creeks (Miles) | Lakes, Ponds, Reservoir (Acres) | Bays, Estuaries (Square Miles) | Coastal Shorelines (Miles) | Oceans, Near Coastal Waters (Square Miles) | Wetlands (Acres) | Great Lakes Shoreline (Miles) | Great Lakes Open Waters (Square Miles) | |
| OTHER | 56.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LAND DISPOSAL | 104.80 | 35,180.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RESOURCE EXTRACTION | 46.00 | 9.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CONTAMINATED SEDIMENTS | 233.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SILVICULTURE HARVESTING | 61.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FOREST ROADS (ROAD CONSTRUCTION AND USE) | 438.90 | 6,029.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| HABITAT MODIFICATION (OTHER THAN HYDROMODIFICATION) | 2,507.00 | 3,780.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| RECREATION AND TOURISM ACTIVITIES (OTHER THAN BOATING - SEE 7900) | 11.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TOTAL RETENTION DOMESTIC SEWAGE LAGOONS | .00 | 3,500.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| IMPACTS FROM ABANDONED MINE LANDS (INACTIVE) | 37.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SITE CLEARANCE (LAND DEVELOPMENT OR REDEVELOPMENT) | 447.80 | 35,180.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPSTREAM IMPOUNDMENTS (E.G., PL-566 NRCS STRUCTURES) | 327.90 | 126,006.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| CONSTRUCTION | 463.30 | 35,180.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SILVICULTURE | 1,144.30 | 137,356.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOSS OF RIPARIAN HABITAT | 1,263.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ATMOSPHERIC DEPOSITON - TOXICS | 58.00 | 376,506.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| SURFACE MINING | 3.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ABANDONED MINING | 1,896.40 | 291,080.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| SUBSURFACE MINING | 97.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| INTENSIVE ANIMAL FEEDING OPERATIONS | 229.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CROP PRODUCTION (CROP LAND OR DRY LAND) | 3,330.80 | 22,876.70 | .00 | .00 | .00 | .00 | .00 | .00 |
| MUNICIPAL (URBANIZED HIGH DENSITY AREA) | 160.90 | 126,006.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| STREAMBANK MODIFICATIONS/DESTABLIZATION | 1,296.20 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| AGRICULTURE | 6,676.20 | 315,385.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| MINE TAILINGS | 364.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CHANNELIZATION | 1,392.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LEAKING UNDERGROUND STORAGE TANKS | 8.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FLOW ALTERATIONS FROM WATER DIVERSIONS | 2,254.09 | 143,089.40 | .00 | .00 | .00 | .00 | .00 | .00 |
| CHANGES IN ORDINARY STRATIFICATION AND BOTTOM WATER HYPOXIA/ANOXIA | .00 | 35,180.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| DREDGE MINING | 97.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BRIDGE CONSTRUCTION | 181.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SEDIMENT RESUSPENSION | 24.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| HIGHWAY/ROAD/BRIDGE CONSTRUCTION | 808.10 | 3,364.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MUNICIPAL POINT SOURCE DISCHARGES | 442.40 | 161,186.90 | .00 | .00 | .00 | .00 | .00 | .00 |
| SILVICULTURE PLANTATION MANAGEMENT | .00 | 3,800.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| HISTORIC BOTTOM DEPOSITS (NOT SEDIMENT) | .80 | 250,500.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LIVESTOCK (GRAZING OR FEEDING OPERATIONS) | 5,221.80 | 4,852.10 | .00 | .00 | .00 | .00 | .00 | .00 |
| HIGHWAY/ROAD/BRIDGE RUNOFF (NON-CONSTRUCTION RELATED) | 485.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PETROLEUM/NATURAL GAS PRODUCTION ACTIVITIES (PERMITTED) | .00 | 9.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ON-SITE TREATMENT SYSTEMS (SEPTIC SYSTEMS AND SIMILAR DECENTRALIZED SYSTEMS) | 28.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MILL TAILINGS | 341.90 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PLACER MINING | 162.40 | 5,500.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SPILLS FROM TRUCKS OR TRAINS | 26.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| DAM CONSTRUCTION (OTHER THAN UPSTREAM FLOOD CONTROL PROJECTS) | 543.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SOURCE UNKNOWN | 287.10 | 138,656.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| HYDROMODIFICATION | 2,764.19 | 175,439.40 | .00 | .00 | .00 | .00 | .00 | .00 |
| ACID MINE DRAINAGE | 698.10 | 40,560.80 | .00 | .00 | .00 | .00 | .00 | .00 |
| UNPAVED ROAD RUNOFF | 122.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| GROUNDWATER LOADINGS | 37.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| INDUSTRIAL POINT SOURCE DISCHARGE | 143.30 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| DREDGING (E.G., FOR NAVIGATION CHANNELS) | 21.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
