Jump to main content.

Return to home page

On This Page 303(d) Listed Waters for 2010

Data are also available for these cycles:
2002 2004 2006 2008

Waterbody Changes from Prior Cycle

For More Information:

State Water Quality Program Exit EPA Disclaimer

Download Excel compatible information

Download GIS Information

Colorado Water Quality Assessment Report

Assessed Waters of Colorado by Watershed

Select a watershed from the list:
or click on the map to choose a watershed:
Search for a waterbody within Colorado
Enter Waterbody Name:
Display impaired waters and TMDL information only
Features


Site-specific Targeted Monitoring Summary Results

Colorado (2010)

Description of this table
  Size of Water
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)
   Good Waters 48,503.4 79,241.6
      Previously impaired waters
      now attaining all uses		 1,237.1 5,762.0
   Threatened Waters
      TMDL completed          
      TMDL alternative          
      Non-pollutant impairment          
      TMDL needed          
   Impaired Waters 11,135.4 76,157.0
      TMDL completed     660.9     
      TMDL alternative     4.1     
      Non-pollutant impairment          
      TMDL needed     10,470.4     76,157.0
         New TMDLs completed     1,918.9     .0
         Remaining TMDLs needed           8,551.5           76,157.0
Total Assessed Waters 59,638.8 155,398.6
Total Waters 107,403.0 164,029.0
Percent of Waters Assessed 55.5 94.7

Top of page

Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2010


Site-specific Targeted Monitoring Results

Colorado Rivers and Streams 2010

Description of this table
Assessed Status Miles
Assessed 59,638.8
Unassessed 47,764.2
Total Miles 107,403.0







arrow pointing right 		Description of this table
Attainment Status Miles
Good 48,503.4
Threatened .0
Impaired 11,135.4
Total Miles Assessed 59,638.8







arrow pointing right 		Description of this table
TMDL Development Status Miles
All TMDLs completed 2,579.9
TMDL alternative 4.1
Non-pollutant impairment .0
TMDL needed 8,551.5
Total Threatened and Impaired 11,135.4

Top of page

Site-specific Targeted Monitoring Results

Individual Designated Use Support
Colorado Rivers and Streams 2010

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Agriculture 56,615.2 96.8 .0 3.2 color.gifcolor.gif
Aquatic Life Cold Water-Class 1 23,627.4 90.5 .0 9.5 color.gifcolor.gif
Aquatic Life Cold Water-Class 2 4,977.8 93.0 .0 7.0 color.gifcolor.gif
Aquatic Life Warm Water-Class 1 1,869.0 43.6 .0 56.4 color.gifcolor.gif
Aquatic Life Warm Water-Class 2 17,371.4 64.1 .0 35.9 color.gifcolor.gif
Domestic Water Source 35,406.6 96.0 .0 4.0 color.gifcolor.gif
Recreation Primary Contact 39,288.4 96.0 .0 4.0 color.gifcolor.gif
Recreation Secondary Contact 11,412.2 98.7 .0 1.3 color.gifcolor.gif

Top of page

Site-specific Targeted Monitoring Results

Causes of Impairment
Colorado Rivers and Streams 2010

Description of this table
Cause of Impairment Cause of Impairment Group Miles
Threatened or
Impaired
Selenium Metals (other than Mercury) color.gif 7,480.5
Escherichia Coli (E. Coli) Pathogens color.gif 1,666.0
Copper Metals (other than Mercury) color.gif 1,008.9
Iron Metals (other than Mercury) color.gif 955.0
Zinc Metals (other than Mercury) color.gif 892.6
Cadmium Metals (other than Mercury) color.gif 773.8
Temperature, Water Temperature color.gif 364.4
Manganese Metals (other than Mercury) color.gif 330.8
Sedimentation/Siltation Sediment color.gif 219.9
pH pH/Acidity/Caustic Conditions color.gif 199.6
Lead Metals (other than Mercury) color.gif 187.4
Dissolved Oxygen Saturation Organic Enrichment/Oxygen Depletion color.gif 111.5
Ammonia, Un-ionized Ammonia color.gif 94.8
Aluminum Metals (other than Mercury) color.gif 83.3
Uranium Radiation color.gif 75.0
Cause Unknown Cause Unknown color.gif 71.5
Arsenic Metals (other than Mercury) color.gif 64.0
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 62.7
Nitrate/Nitrite (Nitrite + Nitrate as N) Nutrients color.gif 45.8
Sulfates Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 19.9
BOD, Sediment Load (Sediment Oxygen Demand) Organic Enrichment/Oxygen Depletion color.gif 12.4
Mercury Mercury color.gif 9.6

Top of page

Site-specific Targeted Monitoring Results

Probable Sources
Colorado Rivers and Streams 2010

Description of this table
Probable Source Probable Source Group Miles
Threatened or
Impaired
Source Unknown Unknown color.gif 5,982.6
Agriculture Agriculture color.gif 1,837.4
Impacts From Abandoned Mine Lands (Inactive) Resource Extraction color.gif 564.0
Upstream Source Other color.gif 47.2
Contaminated Groundwater Groundwater Loadings/Withdrawals color.gif 26.9
Natural Sources Natural/Wildlife color.gif 19.1
Highway/Road/Bridge Runoff (Non-Construction Related) Urban-Related Runoff/Stormwater color.gif 16.3

Top of page

Site-specific Targeted Monitoring Results

Colorado Lakes, Reservoirs, and Ponds 2010

Description of this table
Assessed Status Acres
Assessed 155,398.6
Unassessed 8,630.4
Total Acres 164,029.0







arrow pointing right 		Description of this table
Attainment Status Acres
Good 79,241.6
Threatened .0
Impaired 76,157.0
Total Acres Assessed 155,398.6







arrow pointing right 		Description of this table
TMDL Development Status Acres
All TMDLs completed .0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 76,157.0
Total Threatened and Impaired 76,157.0

Top of page

Site-specific Targeted Monitoring Results

Individual Designated Use Support
Colorado Lakes, Reservoirs, and Ponds 2010

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Acres Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Agriculture 131,620.3 99.8 .0 .2 color.gifcolor.gif
Aquatic Life Cold Water-Class 1 71,594.4 46.1 .0 53.9 color.gifcolor.gif
Aquatic Life Cold Water-Class 2 1,475.8 69.6 .0 30.4 color.gifcolor.gif
Aquatic Life Warm Water-Class 1 43,893.0 28.7 .0 71.3 color.gifcolor.gif
Aquatic Life Warm Water-Class 2 5,585.2 12.9 .0 87.1 color.gifcolor.gif
Domestic Water Source 104,257.6 99.9 .0 .1 color.gifcolor.gif
Recreation Primary Contact 118,547.2 99.2 .0 .8 color.gifcolor.gif
Recreation Secondary Contact 4,099.8 86.4 .0 13.6 color.gifcolor.gif

Top of page

Site-specific Targeted Monitoring Results

Causes of Impairment
Colorado Lakes, Reservoirs, and Ponds 2010

Description of this table
Cause of Impairment Cause of Impairment Group Acres
Threatened or
Impaired
Mercury in Fish Tissue Mercury color.gif 36,982.0
Selenium Metals (other than Mercury) color.gif 29,890.8
Dissolved Oxygen Saturation Organic Enrichment/Oxygen Depletion color.gif 7,136.2
Ammonia, Un-ionized Ammonia color.gif 4,931.2
pH pH/Acidity/Caustic Conditions color.gif 4,401.2
Escherichia Coli (E. Coli) Pathogens color.gif 1,563.4
Iron Metals (other than Mercury) color.gif 671.6
Copper Metals (other than Mercury) color.gif 279.7
Chlorophyll-A Algal Growth color.gif 116.7
Phosphorus, Total Nutrients color.gif 116.7
Arsenic Metals (other than Mercury) color.gif 30.4
Tetrachloroethylene Toxic Organics color.gif 5.5

Top of page

Site-specific Targeted Monitoring Results

Probable Sources
Colorado Lakes, Reservoirs, and Ponds 2010

Description of this table
Probable Source Probable Source Group Acres
Threatened or
Impaired
Source Unknown Unknown color.gif 48,705.3
Agriculture Agriculture color.gif 216.0
Natural Sources Natural/Wildlife color.gif 141.6
Impacts From Abandoned Mine Lands (Inactive) Resource Extraction color.gif 141.6
Contaminated Groundwater Groundwater Loadings/Withdrawals color.gif 5.5

Top of page


Colorado Causes of Impairment for Reporting Year 2010


Description of this table
NOTE: Click on the underlined Cause of Impairment Group to see a list of specific state causes of impairment making up the Cause of Impairment Group. See also Pollution categories summary document (PDF) (20 pp, 557K, About PDF) for brief, non-technical descriptions of general cause categories.
Cause of Impairment Group Size of Assessed Waters with Listed Causes of Impairment
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)
Algal Growth 116.7
Ammonia 94.8 4,931.2
Cause Unknown 71.5
Mercury 9.6 36,982.0
Metals (other than Mercury) 9,642.3 30,730.9
Nutrients 45.8 116.7
Organic Enrichment/Oxygen Depletion 186.6 7,136.2
Pathogens 1,666.0 1,563.4
pH/Acidity/Caustic Conditions 199.6 4,401.2
Radiation 75.0
Salinity/Total Dissolved Solids/Chlorides/Sulfates 19.9
Sediment 219.9
Temperature 364.4
Toxic Organics 5.5

Top of page


Colorado Probable Sources Contributing to Impairments
for Reporting Year 2010

Description of this table
NOTE: Click on the underlined Probable Source Group to see a list of specific state Probable Sources making up the Probable Source Group.
Probable Source Group Size of Assessed Waters with Probable Sources of Impairments
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)
Agriculture 1,837.4 216.0
Groundwater Loadings/Withdrawals 26.9 5.5
Natural/Wildlife 19.1 141.6
Other 47.2
Resource Extraction 564.0 141.6
Unknown 5,982.6 48,705.3
Urban-Related Runoff/Stormwater 16.3

Top of page

Colorado TMDL Alternatives by Cause of Impairment 2010


Description of this table
NOTE: Click on the underlined "Number of TMDL Alternatives by Cause of Impairment " value to see a listing of those Causes of Impairment.
Cause of Impairment Number of
TMDL Alternatives		 Rivers and
Streams (Miles)
Ammonia, Un-ionized color.gif 3 46
Nitrate/Nitrite (Nitrite + Nitrate as N) color.gif 3 46
Zinc color.gif 2 4
Cadmium color.gif 1 2

Total: 9 TMDL Alternatives

Top of page


Colorado Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards

Description of this table
NOTE: Click on the underlined "Number of Waters Attaining" value for a detailed list of those previously 303(d)-listed waters now attaining all applicable water quality standards.
Year Attaining Number of Waters Attaining Number of Causes of
Impairment Addressed
2006 color.gif 1 1
2008 color.gif 7 9
2010 color.gif 16 18

Top of page

Colorado Causes of Impairment for 303(d) Listed Waters

Description of this table
NOTE: Click on a cause of impairment (e.g. pathogens) to see the specific state-reported causes that are grouped to make up this category. Click on the "Number of Causes of Impairment Reported" to see a list of waters with that cause of impairment.
Cause of Impairment Group Name Number of Causes of Impairment Reported
Metals (other than Mercury) color.gif 220
Pathogens color.gif 36
Organic Enrichment/Oxygen Depletion color.gif 24
Mercury color.gif 19
pH/Acidity/Caustic Conditions color.gif 12
Temperature color.gif 9
Ammonia color.gif 6
Sediment color.gif 5
Cause Unknown color.gif 3
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 2
Radiation color.gif 2
Toxic Organics color.gif 1
Algal Growth color.gif 1
Nutrients color.gif 1

Total: 341 Causes of Impairment

Top of page


Colorado Cumulative TMDLs by Pollutant

This chart includes TMDLs since October 1, 1995.

Description of this table
NOTE: Click on the underlined "Pollutant" value to see associated listed waters for which a TMDL was developed. Click on the underlined "Number of TMDLs" value to see a listing of those TMDLs for the pollutant.
Pollutant Number of TMDLs Number of Causes of
Impairment Addressed
Ammonia color.gif 128 128
Fecal Coliform color.gif 126 126
Total Residual Chlorine color.gif 99 101
Zinc color.gif 74 79
Copper color.gif 70 73
Cadmium color.gif 52 55
Chlorine color.gif 45 45
Ammonia, Un-ionized color.gif 41 41
Lead color.gif 39 39
Iron color.gif 38 39
Selenium color.gif 31 51
Mercury color.gif 27 27
Silver color.gif 26 26
Manganese color.gif 23 23
Escherichia Coli (E. Coli) color.gif 22 23
Fecal color.gif 20 20
Cyanide color.gif 17 17
Chlorine, Residual (Chlorine Demand) color.gif 14 14
Aluminum color.gif 8 9
Boron color.gif 8 8
Chromium, Hexavalent color.gif 8 8
Arsenic color.gif 7 7
Phosphorus color.gif 6 8
Sediment color.gif 5 5
Chloride color.gif 4 4
Chromium III color.gif 4 4
Chromium, Total color.gif 4 4
pH color.gif 4 4
Dissolved Oxygen color.gif 3 3
Nickel color.gif 3 3
Sulfide color.gif 3 3
Total Inorganic Nitrogen color.gif 3 3
Uranium color.gif 3 3
Benzene color.gif 2 2
MTBE color.gif 2 2
Nitrate color.gif 2 2
Radium color.gif 2 2
1,2-Dichloroethane color.gif 1 1
Antimony color.gif 1 1
Benzo[a]pyrene color.gif 1 1
Beryllium color.gif 1 1
Chromium IV color.gif 1 1
Contaminated Sediments (Copper) color.gif 1 1
Contaminated Sediments (Nickel) color.gif 1 1
Fluoride color.gif 1 1
Mercury in Fish Tissue color.gif 1 1
Nitrogen color.gif 1 1
Other Toxic Organics color.gif 1 1
Sulfate color.gif 1 1
Tetrachloroethene color.gif 1 1
Thallium color.gif 1 1
Trichloroethene color.gif 1 1

Total: 988 TMDLs; 1,026 Causes of Impairment Addressed


Top of page


Colorado Cumulative Number of TMDLs

EPA Fiscal Year starts October 1 and ends September 30.


Description of this table
NOTE: Click on the underlined "Number of TMDLs Completed" value for a detailed list of the TMDLs for the fiscal year.
Fiscal Year Number of TMDLs Number of Causes of
Impairment Addressed
1997 color.gif 94 96
1998 color.gif 23 23
1999 color.gif 42 42
2000 color.gif 36 36
2001 color.gif 40 40
2002 color.gif 137 139
2003 color.gif 50 50
2004 color.gif 153 153
2005 color.gif 166 166
2006 color.gif 75 75
2007 color.gif 70 71
2008 color.gif 42 45
2009 color.gif 23 29
2010 color.gif 19 22
2011 color.gif 16 37
2012 color.gif 2 2

Total: 988 TMDLs; 1,026 Causes of Impairment Addressed

Top of page


TMDL Document Search


Full Text Search of TMDL Documents

Top of page

Jump to main content.