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On This Page 303(d) Listed Waters for 2012

Data are also available for these cycles:
2002 2004 2006 2008 2010

Waterbody Changes from Prior Cycle

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Colorado Water Quality Assessment Report

Assessed Waters of Colorado by Watershed

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Display impaired waters and TMDL information only



Site-specific Targeted Monitoring Summary Results

Colorado (2012)

Description of this table
 
    58,979.5 82,758.3
       2,024.1 7,902.1
   
                
                
                
                
    12,055.6 70,220.0
           2,498.9     52.8
           2.0     
                
           9,554.8     70,167.2
              23.8     243.5
                    9,531.0           69,923.7
71,035.1 152,978.3
107,403.0 164,029.0
66.1 93.3

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Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2012


Site-specific Targeted Monitoring Results

Colorado Rivers and Streams 2012

Description of this table

All
Rivers and Streams

107,403.0 Miles of Rivers and Streams

Assessed 71,035.1
Unassessed 36,367.9
Total Miles 107,403.0







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Description of this table

Assessed
Rivers and Streams

71,035.1 Miles of
Assessed Rivers and Streams

Good 58,979.5
Threatened .0
Impaired 12,055.6
Total Miles Assessed 71,035.1







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Description of this table

Threatened and Impaired
Rivers and Streams

12,055.6 Miles of
Threatened and Impaired
Rivers and Streams

2,522.7
2.0
.0
9,531.0
Total Threatened and Impaired 12,055.6

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Colorado Rivers and Streams 2012

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

Description of this table
% Good
% Threatened
% Impaired
Agriculture 68,931.3 97.4 .0 2.6 color.gifcolor.gif
Aquatic Life Cold Water-Class 1 29,117.6 91.6 .0 8.4 color.gifcolor.gif
Aquatic Life Cold Water-Class 2 5,486.3 91.5 .0 8.5 color.gifcolor.gif
Aquatic Life Warm Water-Class 1 2,058.9 26.7 .0 73.3 color.gifcolor.gif
Aquatic Life Warm Water-Class 2 27,484.7 77.2 .0 22.8 color.gifcolor.gif
Domestic Water Source 37,901.9 96.1 .0 3.9 color.gifcolor.gif
Recreation Primary Contact 43,670.0 95.6 .0 4.4 color.gifcolor.gif
Recreation Secondary Contact 21,974.1 99.3 .0 .7 color.gifcolor.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Colorado Rivers and Streams 2012

Description of this table
Selenium Metals (other than Mercury) color.gif 7,071.4
Escherichia Coli (E. Coli) Pathogens color.gif 2,050.9
Iron Metals (other than Mercury) color.gif 1,322.7
Copper Metals (other than Mercury) color.gif 1,040.5
Zinc Metals (other than Mercury) color.gif 887.9
Cadmium Metals (other than Mercury) color.gif 809.6
Benthic Macroinvertebrates Bioassessments Cause Unknown - Impaired Biota color.gif 539.5
Manganese Metals (other than Mercury) color.gif 428.9
Temperature, Water Temperature color.gif 375.3
Arsenic Metals (other than Mercury) color.gif 244.4
Dissolved Oxygen Saturation Organic Enrichment/Oxygen Depletion color.gif 242.8
Sedimentation/Siltation Sediment color.gif 215.6
pH pH/Acidity/Caustic Conditions color.gif 200.6
Lead Metals (other than Mercury) color.gif 185.0
Uranium Radiation color.gif 110.2
Ammonia, Un-ionized Ammonia color.gif 99.7
Aluminum Metals (other than Mercury) color.gif 90.6
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 62.7
Sulfates Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 48.1
Nitrate/Nitrite (Nitrite + Nitrate as N) Nutrients color.gif 45.8
Silver Metals (other than Mercury) color.gif 44.8
Cause Unknown Cause Unknown color.gif 39.7
BOD, Sediment Load (Sediment Oxygen Demand) Organic Enrichment/Oxygen Depletion color.gif 12.4
Mercury Mercury color.gif 9.6

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Site-specific Targeted Monitoring Results

Probable Sources
Colorado Rivers and Streams 2012

Description of this table
Source Unknown Unknown color.gif 5,595.2
Agriculture Agriculture color.gif 1,794.0
Impacts From Abandoned Mine Lands (Inactive) Resource Extraction color.gif 550.1
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

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Site-specific Targeted Monitoring Results

Colorado Lakes, Reservoirs, and Ponds 2012

Description of this table

All
Lakes, Reservoirs, and Ponds

164,029.0 Acres of Lakes, Reservoirs, and Ponds

Assessed 152,978.3
Unassessed 11,050.7
Total Acres 164,029.0







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Description of this table

Assessed
Lakes, Reservoirs, and Ponds

152,978.3 Acres of
Assessed Lakes, Reservoirs, and Ponds

Good 82,758.3
Threatened .0
Impaired 70,220.0
Total Acres Assessed 152,978.3







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Description of this table

Threatened and Impaired
Lakes, Reservoirs, and Ponds

70,220.0 Acres of
Threatened and Impaired
Lakes, Reservoirs, and Ponds

296.3
.0
.0
69,923.7
Total Threatened and Impaired 70,220.0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Colorado Lakes, Reservoirs, and Ponds 2012

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

Description of this table
% Good
% Threatened
% Impaired
Agriculture 137,900.1 100.0 .0 .0 color.gifcolor.gif
Aquatic Life Cold Water-Class 1 77,609.9 62.0 .0 38.0 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 56,856.9 40.5 .0 59.5 color.gifcolor.gif
Aquatic Life Warm Water-Class 2 6,557.2 17.2 .0 82.8 color.gifcolor.gif
Domestic Water Source 111,878.5 99.7 .0 .3 color.gifcolor.gif
Recreation Primary Contact 128,338.6 96.4 .0 3.6 color.gifcolor.gif
Recreation Secondary Contact 3,319.0 100.0 .0 .0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Colorado Lakes, Reservoirs, and Ponds 2012

Description of this table
Selenium Metals (other than Mercury) color.gif 29,169.5
Mercury in Fish Tissue Mercury color.gif 24,301.5
Dissolved Oxygen Saturation Organic Enrichment/Oxygen Depletion color.gif 11,927.6
pH pH/Acidity/Caustic Conditions color.gif 7,741.0
Copper Metals (other than Mercury) color.gif 4,226.9
Ammonia, Un-ionized Ammonia color.gif 3,977.2
Arsenic Metals (other than Mercury) color.gif 2,960.7
Temperature, Water Temperature color.gif 2,023.6
Escherichia Coli (E. Coli) Pathogens color.gif 998.0
Iron Metals (other than Mercury) color.gif 883.6
Manganese Metals (other than Mercury) color.gif 290.6
Lead Metals (other than Mercury) color.gif 237.2
Phosphorus, Total Nutrients color.gif 116.7
Chlorophyll-A Algal Growth color.gif 116.7
Tetrachloroethylene Toxic Organics color.gif 5.5

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Site-specific Targeted Monitoring Results

Probable Sources
Colorado Lakes, Reservoirs, and Ponds 2012

Description of this table
Source Unknown Unknown color.gif 49,165.5
Impacts From Abandoned Mine Lands (Inactive) Resource Extraction color.gif 141.6
Natural Sources Natural/Wildlife color.gif 141.6
Agriculture Agriculture color.gif 52.8
Contaminated Groundwater Groundwater Loadings/Withdrawals color.gif 5.5

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Colorado Causes of Impairment for Reporting Year 2012


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.
Size of Assessed Waters with Listed Causes of Impairment
Algal Growth 116.7
Ammonia 99.7 3,977.2
Cause Unknown 39.7
Cause Unknown - Impaired Biota 539.5
Mercury 9.6 24,301.5
Metals (other than Mercury) 9,821.5 35,579.3
Nutrients 45.8 116.7
Organic Enrichment/Oxygen Depletion 318.0 11,927.6
Pathogens 2,050.9 998.0
pH/Acidity/Caustic Conditions 200.6 7,741.0
Radiation 110.2
Salinity/Total Dissolved Solids/Chlorides/Sulfates 48.1
Sediment 215.6
Temperature 375.3 2,023.6
Toxic Organics 5.5

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Colorado Probable Sources Contributing to Impairments
for Reporting Year 2012

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.
Size of Assessed Waters with Probable Sources of Impairments
Agriculture 1,794.0 52.8
Groundwater Loadings/Withdrawals 26.9 5.5
Natural/Wildlife 19.1 141.6
Other 47.2
Resource Extraction 550.1 141.6
Unknown 5,595.2 49,165.5
Urban-Related Runoff/Stormwater 16.3

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Colorado TMDL Alternatives by Cause of Impairment 2012


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.
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

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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.
2006 color.gif 1 1
2008 color.gif 7 9
2010 color.gif 16 18
2013 color.gif 8 10

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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.
Metals (other than Mercury) color.gif 237
Pathogens color.gif 39
Organic Enrichment/Oxygen Depletion color.gif 36
Cause Unknown - Impaired Biota color.gif 34
pH/Acidity/Caustic Conditions color.gif 21
Mercury color.gif 18
Temperature color.gif 17
Ammonia color.gif 7
Sediment color.gif 6
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 5
Radiation color.gif 3
Algal Growth color.gif 1
Nutrients color.gif 1
Toxic Organics color.gif 1

Total: 426 Causes of Impairment

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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.
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 77 80
Copper color.gif 73 73
Cadmium color.gif 54 56
Chlorine color.gif 45 45
Ammonia, Un-ionized color.gif 41 41
Iron color.gif 40 40
Lead color.gif 40 40
Selenium color.gif 33 51
Mercury color.gif 27 27
Silver color.gif 26 26
Escherichia Coli (E. Coli) color.gif 23 23
Manganese color.gif 23 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
Phosphorus, Total color.gif 3 5
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: 1,005 TMDLs; 1,035 Causes of Impairment Addressed


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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.
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 27 29
2010 color.gif 22 22
2011 color.gif 19 37
2012 color.gif 2 2
2013 color.gif 7 9

Total: 1,005 TMDLs; 1,035 Causes of Impairment Addressed

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