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Assessment Data for the State of Colorado Year 2004
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State of Colorado websites: | No State 305(b) Water Quality Assessment Report is available. |
| 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) | Inland Lake Shoreline (Miles) | |
| Total Assessed Waters | 61,460.81 | 73,119.10 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| Estimated Total Water Size in CO | 107,403.00 | 164,029.00 | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable |
| Percent of Waters Assessed | 57.22 | 44.58 | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable | Unavailable |
Assessed Waters of Colorado by Watershed (8 Digit USGS Cataloging Unit)
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) | Inland Lake Shoreline (Miles) | |
| ALAMOSA-TRINCHERA | 1,889.48 | 816.71 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ANIMAS | 694.19 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| APISHAPA | 138.33 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ARIKAREE | 78.33 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ARKANSAS HEADWATERS | 3,319.29 | 4,490.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BEAR | 640.71 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG SANDY | 25.01 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BIG THOMPSON | 509.13 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BLUE | 521.39 | 5,470.34 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CACHE LA POUDRE | 638.47 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CHICO | 628.54 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CIMARRON HEADWATERS | 563.63 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CLEAR | 436.47 | 21.69 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| COLORADO HEADWATERS | 4,819.49 | 10,813.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| COLORADO HEADWATERS-PLATEAU | 3,500.99 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CONEJOS | 357.61 | 947.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| EAGLE | 1,085.27 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| EAST-TAYLOR | 732.64 | 2,040.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FOUNTAIN | 1,286.88 | 78.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| HORSE | 132.91 | 2,194.52 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| HUERFANO | 369.01 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LITTLE SNAKE | 391.46 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER DOLORES | 779.39 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER GREEN-DIAMOND | 53.62 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER GUNNISON | 2,099.78 | 655.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER SOUTH PLATTE | 1,049.87 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER WHITE | 91.77 | 615.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LOWER YAMPA | 2,002.57 | 780.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MANCOS | 175.33 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MCELMO | 616.52 | 577.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE SAN JUAN | 137.51 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE SOUTH PLATTE-CHERRY CREEK | 863.16 | 6,866.23 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MIDDLE SOUTH PLATTE-STERLING | 57.18 | 3,080.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MONTEZUMA | 990.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NORTH FORK CIMARRON | 160.88 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NORTH FORK GUNNISON | 970.29 | 317.89 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NORTH PLATTE HEADWATERS | 2,491.06 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PARACHUTE-ROAN | 794.87 | 160.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PICEANCE-YELLOW | 1,026.74 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PIEDRA | 481.82 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PURGATOIRE | 202.74 | 2,018.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RIO CHAMA | 88.56 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RIO GRANDE HEADWATERS | 1,084.29 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ROARING FORK | 1,231.29 | 29.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| RUSH | 182.39 | 57.08 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAGUACHE | 1,056.41 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAN LUIS | 695.31 | 530.48 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAN MIGUEL | 1,826.40 | 410.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SAND ARROYO | 315.08 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SOUTH FORK REPUBLICAN | 16.95 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SOUTH PLATTE HEADWATERS | 29.40 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ST. VRAIN | 743.35 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TOMICHI | 846.36 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TWO BUTTE | 141.92 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UNCOMPAHANGE | 1,030.60 | 1,155.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER ARKANSAS | 2,925.56 | 1,342.31 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER ARKANSAS-JOHN MARTIN RESERVOIR | 358.31 | 3,352.33 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER ARKANSAS-LAKE MEREDITH | 219.51 | 6,708.92 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER CIMARRON | 470.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER DOLORES | 1,889.85 | 4,470.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER GREEN-FLAMING GORGE RESERVOIR | 42.20 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER GUNNISON | 2,208.84 | 10,491.89 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER LARAMIE | 52.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER NORTH PLATTE | 215.96 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER RIO GRANDE | 81.08 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER SAN JUAN | 932.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER SOUTH PLATTE | 635.34 | 1,523.82 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER WHITE | 1,561.48 | 117.08 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UPPER YAMPA | 2,871.81 | 1,011.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| VERMILION | 48.36 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| WESTWATER CANYON | 430.97 | .00 | .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 |
|---|---|---|---|---|---|
 % Threatened |
|||||
 % Impaired |
|||||
| AGRICULTURE | 53,224.21 | 99.82 | .00 | .18 | |
| AQUATIC LIFE COLD WATER-CLASS 1 | 30,514.03 | 95.75 | .00 | 4.25 | |
| AQUATIC LIFE COLD WATER-CLASS 2 | 6,328.03 | 87.59 | .00 | 12.41 | |
| AQUATIC LIFE WARM WATER-CLASS 1 | 1,460.88 | 60.26 | .00 | 39.74 | |
| AQUATIC LIFE WARM WATER-CLASS 2 | 20,540.77 | 77.08 | .00 | 22.92 | |
| DOMESTIC WATER SOURCE | 35,408.85 | 99.79 | .00 | .21 | |
| RECREATION PRIMARY CONTACT | 37,858.36 | 98.86 | .00 | 1.14 | |
| RECREATION SECONDARY CONTACT | 17,375.58 | 100.00 | .00 | .00 | |
Colorado Assessed Waters
Water Quality Attainment for Rivers and Streams
Description of this table
| Attainment Status | Miles | Percent of Assessed |
| Good | 53,701.72 | 87.38 |
| Threatened | .00 | .00 |
| Impaired | 7,759.09 | 12.62 |
| Total Miles Assessed | 61,460.81 | 100.00 |
Colorado Top Causes of Impairments
for Rivers and Streams
Description of this table
| # | State Cause Name | Total Miles Impaired |
|---|---|---|
| 1 | UNKNOWN BIOLOGIC STRESSOR | 7,199.27 |
| 2 | SELENIUM | 6,224.95 |
| 3 | IRON | 835.11 |
| 4 | ZINC | 648.73 |
| 5 | COPPER | 314.38 |
| 6 | FECAL COLIFORM | 294.57 |
| 7 | CADMIUM | 142.38 |
| 8 | LEAD | 125.17 |
| 9 | BACTERIA, ESCHERICHIA COLI | 120.18 |
| 10 | PH | 103.30 |
Colorado Top Probable Sources of Impairments
for Rivers and Streams
No Probable Sources Reported.
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 |
|---|---|---|---|---|---|
| % Threatened |
|||||
| % Impaired |
|||||
| AGRICULTURE | 60,882.93 | 100.00 | .00 | .00 | |
| AQUATIC LIFE COLD WATER-CLASS 1 | 47,986.13 | 86.97 | .00 | 13.03 | |
| AQUATIC LIFE COLD WATER-CLASS 2 | 141.98 | .00 | .00 | 100.00 | |
| AQUATIC LIFE WARM WATER-CLASS 1 | 16,482.75 | 92.58 | .00 | 7.42 | |
| AQUATIC LIFE WARM WATER-CLASS 2 | 4,537.32 | 3.08 | .00 | 96.92 | |
| DOMESTIC WATER SOURCE | 51,228.88 | 100.00 | .00 | .00 | |
| FISH CONSUMPTION | 6,044.71 | .00 | .00 | 100.00 | |
| RECREATION PRIMARY CONTACT | 50,281.05 | 100.00 | .00 | .00 | |
| RECREATION SECONDARY CONTACT | 2,449.47 | 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 | 61,024.86 | 83.46 |
| Threatened | .00 | .00 |
| Impaired | 12,094.24 | 16.54 |
| Total Acres Assessed | 73,119.10 | 100.00 |
Colorado Top Causes of Impairments
for Lakes, Ponds and Reservoirs
Description of this table
| # | State Cause Name | Total Acres Impaired |
|---|---|---|
| 1 | UNKNOWN BIOLOGIC STRESSOR | 6,314.07 |
| 2 | MERCURY IN FISH TISSUE | 5,819.02 |
| 3 | MERCURY | 5,047.50 |
| 4 | PH | 3,824.85 |
| 5 | SUSPENDED ALGAE | 916.22 |
| 6 | CHLOROPHYLL-A | 916.22 |
| 7 | AMMONIA (UN-IONIZED) | 530.48 |
| 8 | IRON | 530.48 |
| 9 | DISSOLVED OXYGEN SATURATION | 476.00 |
| 10 | SELENIUM | 285.60 |
Colorado Top Probable Sources of Impairments
for Lakes, Ponds and Reservoirs
No Probable Sources Reported.
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 (Square Miles) | Inland Lake Shoreline (Miles) | |
| ALUMINUM | 54.48 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| AMMONIA (UN-IONIZED) | 45.14 | 530.48 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ARSENIC | .00 | 21.69 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BACTERIA, ESCHERICHIA COLI | 120.18 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| BOD, SEDIMENT LOAD (SEDIMENT OXYGEN DEMAND) | 12.48 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CADMIUM | 142.38 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| CHLOROPHYLL-A | .00 | 916.22 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| COPPER | 314.38 | 141.98 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| DISSOLVED OXYGEN SATURATION | 10.00 | 476.00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| FECAL COLIFORM | 294.57 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| IMPAIRMENT UNKNOWN | 33.61 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| IRON | 835.11 | 530.48 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| LEAD | 125.17 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MANGANESE | 25.80 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MERCURY | .00 | 5,047.50 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| MERCURY IN FISH TISSUE | .00 | 5,819.02 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NITRATES | 27.65 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| NITROGEN, NITRATE | 27.65 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| PH | 103.30 | 3,824.85 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SEDIMENTATION/SILTATION | 32.70 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SELENIUM | 6,224.95 | 285.60 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SILVER | 11.95 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| SUSPENDED ALGAE | .00 | 916.22 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| TEMPERATURE, WATER | 33.61 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| UNKNOWN BIOLOGIC STRESSOR | 7,199.27 | 6,314.07 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
| ZINC | 648.73 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 |
Colorado
Probable Sources Contributing to Impairment
No Source Data Reported by the State.
