Site-specific Targeted Monitoring Summary Results

Colorado (2012)

	Size of Water
	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Good Waters	58,979.5	82,758.3
Previously impaired waters       now attaining all uses	2,024.1	7,902.1
Threatened Waters
TMDL completed
TMDL alternative
Non-pollutant impairment
TMDL needed
Impaired Waters	12,055.6	70,220.0
TMDL completed	2,498.9	52.8
TMDL alternative	2.0
Non-pollutant impairment
TMDL needed	9,554.8	70,167.2
New TMDLs completed	78.2	243.5
Remaining TMDLs needed	9,476.6	69,923.7
Total Assessed Waters	71,035.1	152,978.3
Total Waters	107,403.0	164,029.0
Percent of Waters Assessed	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 Status Miles Assessed 71,035.1 Unassessed 36,367.9 Total Miles 107,403.0

Description of this table Assessed Rivers and Streams 71,035.1 Miles of Assessed Rivers and Streams Attainment Status Miles Good 58,979.5 Threatened .0 Impaired 12,055.6 Total Miles Assessed 71,035.1

Description of this table Threatened and Impaired Rivers and Streams 12,055.6 Miles of Threatened and Impaired Rivers and Streams TMDL Development Status Miles All TMDLs completed 2,577.0 TMDL alternative 2.0 Non-pollutant impairment .0 TMDL needed 9,476.6 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.

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

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Site-specific Targeted Monitoring Results

Causes of Impairment
Colorado Rivers and Streams 2012

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

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Site-specific Targeted Monitoring Results

Probable Sources
Colorado Rivers and Streams 2012

Probable Source	Probable Source Group	Miles Threatened or Impaired
Source Unknown	Unknown	5,595.2
Agriculture	Agriculture	1,794.0
Impacts From Abandoned Mine Lands (Inactive)	Resource Extraction	550.1
Upstream Source	Other	47.2
Contaminated Groundwater	Groundwater Loadings/Withdrawals	26.9
Natural Sources	Natural/Wildlife	19.1
Highway/Road/Bridge Runoff (Non-Construction Related)	Urban-Related Runoff/Stormwater	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 Status Acres Assessed 152,978.3 Unassessed 11,050.7 Total Acres 164,029.0

Description of this table Assessed Lakes, Reservoirs, and Ponds 152,978.3 Acres of Assessed Lakes, Reservoirs, and Ponds Attainment Status Acres Good 82,758.3 Threatened .0 Impaired 70,220.0 Total Acres Assessed 152,978.3

Description of this table Threatened and Impaired Lakes, Reservoirs, and Ponds 70,220.0 Acres of Threatened and Impaired Lakes, Reservoirs, and Ponds TMDL Development Status Acres All TMDLs completed 296.3 TMDL alternative .0 Non-pollutant impairment .0 TMDL needed 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.

Designated Use	Acres Assessed	Percent Good	Percent Threatened	Percent Impaired	% Good
					% Threatened
					% Impaired
Agriculture	137,900.1	100.0	.0	.0
Aquatic Life Cold Water-Class 1	77,609.9	62.0	.0	38.0
Aquatic Life Cold Water-Class 2	1,475.8	69.6	.0	30.4
Aquatic Life Warm Water-Class 1	56,856.9	40.5	.0	59.5
Aquatic Life Warm Water-Class 2	6,557.2	17.2	.0	82.8
Domestic Water Source	111,878.5	99.7	.0	.3
Recreation Primary Contact	128,338.6	96.4	.0	3.6
Recreation Secondary Contact	3,319.0	100.0	.0	.0

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Site-specific Targeted Monitoring Results

Causes of Impairment
Colorado Lakes, Reservoirs, and Ponds 2012

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

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Site-specific Targeted Monitoring Results

Probable Sources
Colorado Lakes, Reservoirs, and Ponds 2012

Probable Source	Probable Source Group	Acres Threatened or Impaired
Source Unknown	Unknown	49,165.5
Impacts From Abandoned Mine Lands (Inactive)	Resource Extraction	141.6
Natural Sources	Natural/Wildlife	141.6
Agriculture	Agriculture	52.8
Contaminated Groundwater	Groundwater Loadings/Withdrawals	5.5

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Colorado Causes of Impairment for Reporting Year 2012

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Colorado Probable Sources Contributing to Impairments
for Reporting Year 2012

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Colorado TMDL Alternatives by Cause of Impairment 2012

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	3	46
Nitrate/Nitrite (Nitrite + Nitrate as N)	3	46
Zinc	2	4
Cadmium	1	2

Total: 9 TMDL Alternatives

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

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	1	1
2008	7	9
2010	16	18
2013	8	10

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Colorado Causes of Impairment for 303(d) Listed Waters

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

Total: 426 Causes of Impairment

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Colorado Cumulative TMDLs by Pollutant

This chart includes TMDLs since October 1, 1995.

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	128	128
Fecal Coliform	126	126
Total Residual Chlorine	99	101
Zinc	80	83
Copper	76	76
Cadmium	57	60
Chlorine	45	45
Ammonia, Un-ionized	41	41
Lead	41	41
Iron	40	40
Selenium	34	52
Mercury	27	27
Escherichia Coli (E. Coli)	26	26
Silver	26	26
Manganese	23	23
Fecal	20	20
Cyanide	17	17
Chlorine, Residual (Chlorine Demand)	14	14
Aluminum	8	9
Boron	8	8
Chromium, Hexavalent	8	8
Arsenic	7	7
Phosphorus	6	8
Sediment	5	5
pH	5	5
Chloride	4	4
Chromium III	4	4
Chromium, Total	4	4
Uranium	4	4
Dissolved Oxygen	3	3
Nickel	3	3
Phosphorus, Total	3	5
Sulfide	3	3
Total Inorganic Nitrogen	3	3
Benzene	2	2
MTBE	2	2
Nitrate	2	2
Radium	2	2
1,2-Dichloroethane	1	1
Antimony	1	1
Benzo[a]pyrene	1	1
Beryllium	1	1
Chromium IV	1	1
Contaminated Sediments (Copper)	1	1
Contaminated Sediments (Nickel)	1	1
Fluoride	1	1
Mercury in Fish Tissue	1	1
Nitrogen	1	1
Other Toxic Organics	1	1
Sulfate	1	1
Tetrachloroethene	1	1
Thallium	1	1
Trichloroethene	1	1

Total: 1,021 TMDLs; 1,052 Causes of Impairment Addressed

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Colorado Cumulative Number of TMDLs

EPA Fiscal Year starts October 1 and ends September 30.

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	94	96
1998	23	23
1999	42	42
2000	36	36
2001	40	40
2002	128	130
2003	59	59
2004	153	153
2005	166	166
2006	75	75
2007	70	71
2008	42	45
2009	27	29
2010	22	22
2011	19	37
2012	2	2
2013	7	9
2015	11	12
2016	5	5

Total: 1,021 TMDLs; 1,052 Causes of Impairment Addressed

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TMDL Document Search

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