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Assessment Data for the State of Colorado Year 2002
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Other Water Assessment Information
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State of Colorado websites: | State 305(b) Water Quality Assessment Report(s) |
| State Water Quality Program |
Search for a Waterbody within Colorado
Total Assessed Waters for the State of Colorado
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 | 70,899.90 | 74,517.40 | .00 | .00 | .00 | .00 | .00 | .00 |
| Estimated Total Water Size in CO | 107,403.00 | 164,029.00 | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable |
| Percent of Waters Assessed | 66.01 | 45.43 | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable |
Assessed Waters of Colorado 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) | |
| ALAMOSA-TRINCHERA | 2,266.29 | 2,291.17 | .00 | .00 | .00 | .00 | .00 | .00 |
| ANIMAS | 696.69 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| APISHAPA | 1,011.47 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ARIKAREE | 78.33 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ARKANSAS HEADWATERS | 3,653.65 | 4,490.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BEAR | 1,181.19 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG SANDY | 1,475.67 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG THOMPSON | 498.82 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BLUE | 101.18 | 3,345.34 | .00 | .00 | .00 | .00 | .00 | .00 |
| CACHE LA POUDRE | 482.46 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CHICO | 678.54 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CIMARRON HEADWATERS | 563.63 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CLEAR | 399.79 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| COLORADO HEADWATERS | 2,366.66 | 5,257.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| COLORADO HEADWATERS-PLATEAU | 3,200.73 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CONEJOS | 582.84 | 947.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| EAGLE | 1,085.27 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| EAST-TAYLOR | 727.14 | 2,040.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FOUNTAIN | 1,292.65 | 78.40 | .00 | .00 | .00 | .00 | .00 | .00 |
| HORSE | 957.18 | 2,701.76 | .00 | .00 | .00 | .00 | .00 | .00 |
| HUERFANO | 1,875.61 | 420.25 | .00 | .00 | .00 | .00 | .00 | .00 |
| LITTLE SNAKE | 208.46 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER DOLORES | 779.39 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER GREEN-DIAMOND | 85.47 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER GUNNISON | 2,226.39 | 186.93 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER SOUTH PLATTE | 1,049.87 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER WHITE | 91.77 | 615.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER YAMPA | 2,106.03 | 780.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MANCOS | 274.02 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MCELMO | 648.72 | 955.64 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE SAN JUAN | 137.51 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE SOUTH PLATTE-CHERRY CREEK | 799.45 | 3,175.89 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE SOUTH PLATTE-STERLING | 57.18 | 3,080.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MONTEZUMA | 435.02 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NORTH FORK CIMARRON | 160.88 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NORTH FORK GUNNISON | 970.29 | 317.89 | .00 | .00 | .00 | .00 | .00 | .00 |
| NORTH FORK REPUBLICAN | 36.68 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NORTH PLATTE HEADWATERS | 2,377.62 | 764.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PARACHUTE-ROAN | 724.97 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PICEANCE-YELLOW | 1,056.23 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PIEDRA | 481.82 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PURGATOIRE | 2,737.85 | 2,018.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RIO CHAMA | 88.56 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RIO GRANDE HEADWATERS | 1,114.37 | 541.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ROARING FORK | 496.38 | 29.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RUSH | 719.48 | 57.08 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAGUACHE | 1,538.11 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAN LUIS | 1,020.69 | 734.23 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAN MIGUEL | 1,726.40 | 410.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAND ARROYO | 315.08 | 22.87 | .00 | .00 | .00 | .00 | .00 | .00 |
| SOUTH FORK REPUBLICAN | 16.95 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SOUTH PLATTE HEADWATERS | 1,565.17 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ST. VRAIN | 770.03 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TOMICHI | 896.36 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TWO BUTTE | 636.01 | 733.81 | .00 | .00 | .00 | .00 | .00 | .00 |
| UNCOMPAHANGE | 1,026.31 | 1,155.60 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER ARKANSAS | 2,915.29 | 1,342.96 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER ARKANSAS-JOHN MARTIN RESERVOIR | 2,319.03 | 11,681.76 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER ARKANSAS-LAKE MEREDITH | 1,275.89 | 6,708.92 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER CIMARRON | 470.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER DOLORES | 1,889.85 | 4,470.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER GREEN-FLAMING GORGE RESERVOIR | 45.56 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER GUNNISON | 1,224.55 | 10,491.89 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER LARAMIE | 52.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER NORTH PLATTE | 160.51 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER RIO GRANDE | 82.21 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER SAN JUAN | 934.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER SOUTH PLATTE | 1,310.06 | 1,523.82 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER WHITE | 1,328.36 | 139.19 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER YAMPA | 1,618.16 | 1,011.00 | .00 | .00 | .00 | .00 | .00 | .00 |
| VERMILION | 637.42 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| WESTWATER CANYON | 420.97 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| WHITEWOMAN | 114.14 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
Colorado 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 |
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|---|---|---|---|---|---|---|
 % Threatened |
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 % Impaired |
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Fish, Shellfish, and Wildlife Protection and Propagation | 70,647.70 | 91.20 | .00 | 8.80 | |
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Recreation | 65,906.43 | 99.77 | .00 | .23 | |
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Public Water Supply | 33,118.41 | 99.05 | .00 | .95 | |
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Agricultural | 70,131.31 | 99.90 | .00 | .10 | |
Colorado Assessed Waters
Water Quality Attainment for Rivers and Streams
Description of this table
| Attainment Status | Miles | Percent of Assessed |
| Good | 64,585.87 | 91.09 |
| Threatened | .00 | .00 |
| Impaired | 6,314.03 | 8.91 |
| Total Miles Assessed | 70,899.90 | 100.00 |
Colorado Top Causes of Impairments
for Rivers and Streams
Description of this table
| # | State Cause Name | Total Miles Impaired |
|---|---|---|
| 1 | COPPER | 800.65 |
| 2 | CADMIUM | 494.53 |
| 3 | ZINC | 358.47 |
| 4 | SELENIUM | 308.92 |
| 5 | SULFATES | 185.62 |
| 6 | METALS | 175.87 |
| 7 | SEDIMENTATION/SILTATION | 89.67 |
| 8 | LEAD | 74.00 |
| 9 | CAUSE UNKNOWN | 71.27 |
| 10 | PATHOGENS | 67.93 |
Colorado Top Probable Sources of Impairments
for Rivers and Streams
Description of this table
| # | State Source Name | Total Miles Impaired by Source |
|---|---|---|
| 1 | RESOURCE EXTRACTION | 620.77 |
| 2 | SOURCE UNKNOWN | 319.87 |
| 3 | AGRICULTURE | 123.30 |
| 4 | MUNICIPAL (URBANIZED HIGH DENSITY AREA) | 52.12 |
| 5 | MUNICIPAL POINT SOURCE DISCHARGES | 40.25 |
| 6 | ABANDONED MINING | 21.87 |
| 7 | SUBSURFACE MINING | 21.87 |
| 8 | ACID MINE DRAINAGE | 21.87 |
| 9 | EROSION AND SEDIMENTATION | 20.94 |
| 10 | HIGHWAYS, ROADS, BRIDGES, INFRASTRUCTURE (NEW CONSTRUCTION) | 20.94 |
Colorado 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 |
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|---|---|---|---|---|---|---|
| % Threatened |
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| % Impaired |
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Fish, Shellfish, and Wildlife Protection and Propagation | 64,367.65 | 89.70 | .00 | 10.30 | |
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Recreation | 73,960.95 | 100.00 | .00 | .00 | |
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Public Water Supply | 46,047.68 | 100.00 | .00 | .00 | |
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Aquatic Life Harvesting | 6,353.36 | .00 | .00 | 100.00 | |
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Agricultural | 64,011.62 | 100.00 | .00 | .00 | |
Colorado Assessed Waters
Water Quality Attainment for Lakes, Ponds and Reservoirs
Description of this table
| Attainment Status | Acres | Percent of Assessed |
| Good | 67,888.53 | 91.10 |
| Threatened | .00 | .00 |
| Impaired | 6,628.87 | 8.90 |
| Total Acres Assessed | 74,517.40 | 100.00 |
Colorado Top Causes of Impairments
for Lakes, Ponds and Reservoirs
Description of this table
| # | State Cause Name | Total Acres Impaired |
|---|---|---|
| 1 | MERCURY | 6,353.36 |
| 2 | PESTICIDES | 156.20 |
| 3 | PH | 141.98 |
| 4 | COPPER | 141.98 |
| 5 | ZINC | 141.98 |
| 6 | SELENIUM | 125.60 |
| 7 | PATHOGENS | 7.93 |
| 8 | AMMONIA (UNIONIZED) - TOXIN | 7.93 |
Colorado Top Probable Sources of Impairments
for Lakes, Ponds and Reservoirs
Description of this table
| # | State Source Name | Total Acres Impaired by Source |
|---|---|---|
| 1 | SOURCE UNKNOWN | 1,349.02 |
| 2 | INDUSTRIAL POINT SOURCE DISCHARGE | 156.20 |
| 3 | RESOURCE EXTRACTION | 141.98 |
| 4 | AGRICULTURE | 133.53 |
| 5 | MUNICIPAL POINT SOURCE DISCHARGES | 7.93 |
Colorado
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 | 358.47 | 141.98 | .00 | .00 | .00 | .00 | .00 | .00 |
| ARSENIC | 16.17 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CAUSE UNKNOWN | 71.27 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| METALS | 175.87 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PATHOGENS | 67.93 | 7.93 | .00 | .00 | .00 | .00 | .00 | .00 |
| SULFATES | 185.62 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| AMMONIA (UNIONIZED) - TOXIN | 46.48 | 7.93 | .00 | .00 | .00 | .00 | .00 | .00 |
| LEAD | 74.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MERCURY | .00 | 6,353.36 | .00 | .00 | .00 | .00 | .00 | .00 |
| CADMIUM | 494.53 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SELENIUM | 308.92 | 125.60 | .00 | .00 | .00 | .00 | .00 | .00 |
| SEDIMENTATION/SILTATION | 89.67 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PH | 51.29 | 141.98 | .00 | .00 | .00 | .00 | .00 | .00 |
| COPPER | 800.65 | 141.98 | .00 | .00 | .00 | .00 | .00 | .00 |
| PESTICIDES | .00 | 156.20 | .00 | .00 | .00 | .00 | .00 | .00 |
Colorado
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) | |
| RESOURCE EXTRACTION | 620.77 | 141.98 | .00 | .00 | .00 | .00 | .00 | .00 |
| EROSION AND SEDIMENTATION | 20.94 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SILVICULTURE | 10.52 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ABANDONED MINING | 21.87 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SUBSURFACE MINING | 21.87 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MUNICIPAL (URBANIZED HIGH DENSITY AREA) | 52.12 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| HIGHWAYS, ROADS, BRIDGES, INFRASTRUCTURE (NEW CONSTRUCTION) | 20.94 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| AGRICULTURE | 123.30 | 133.53 | .00 | .00 | .00 | .00 | .00 | .00 |
| MUNICIPAL POINT SOURCE DISCHARGES | 40.25 | 7.93 | .00 | .00 | .00 | .00 | .00 | .00 |
| HIGHWAY/ROAD/BRIDGE RUNOFF (NON-CONSTRUCTION RELATED) | 14.08 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SOURCE UNKNOWN | 319.87 | 1,349.02 | .00 | .00 | .00 | .00 | .00 | .00 |
| HYDROMODIFICATION | 4.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ACID MINE DRAINAGE | 21.87 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| INDUSTRIAL POINT SOURCE DISCHARGE | .00 | 156.20 | .00 | .00 | .00 | .00 | .00 | .00 |
