Site-specific Targeted Monitoring Summary Results

Wyoming (2012)

	Size of Water
	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Good Waters	15,696.9	12,475.2
Previously impaired waters       now attaining all uses	32.8
Threatened Waters	392.9
TMDL completed
TMDL alternative
Non-pollutant impairment
TMDL needed	392.9
Impaired Waters	1,423.2	6,237.8
TMDL completed	82.5	6,075.8
TMDL alternative
Non-pollutant impairment	46.3
TMDL needed	1,294.4	162.0
New TMDLs completed	450.2	15.4
Remaining TMDLs needed	844.2	146.6
Total Assessed Waters	17,513.0	18,713.0
Total Waters	108,767.0	325,048.0
Percent of Waters Assessed	16.1	5.8

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

Description of this table % Fully Supporting    % Not Supporting    % Unassessed    % Not Applicable   

Designated Use	Stressors
Aquatic Life Other Than Fish Fully Supporting 58% ± 15.1% Not Supporting 18% ± 12.5% Not Applicable 24% ± 14.2%	Stressors Fully Supporting Not Supporting Unassessed Not Applicable Habitat Alterations 59.5% ± 13.9% 40.5% ± 13.9%     Nitrate/Nitrite 82.6% ± 12.2% 6.8% ± 7.7%     Phosphorus, Total 48.2% ± 16.6% 14.4% ± 11%     Riparian Habitat Alteration 64.1% ± 15.6% 35.9% ± 15.6%     Salinity/Total Dissolved Solids/Chlorides/Sulfates 100% ± 0% 0% ± 0%     Specific Conductivity 49.4% ± 14.5% 26.4% ± 15.4%     Suspended Sediment Concentration 27% ± 12.6% 37.1% ± 14.6%     pH/Acidity/Caustic Conditions 100% ± 0% 0% ± 0%
Recreation Fully Supporting 80% ± 13.6% Not Supporting 3% ± 3.3% Not Applicable 17% ± 13.2%	Stressors Fully Supporting Not Supporting Unassessed Not Applicable Escherichia Coli (E. Coli) 80.2% ± 13.6% 3.3% ± 3.3%

Where two or more state condition categories fall under one national category, EPA used the largest margin of error for purposes of displaying this information in the report.

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Site-specific Targeted Monitoring Results

Wyoming Rivers and Streams 2012

Description of this table All Rivers and Streams 108,767.0 Miles of Rivers and Streams Assessed Status Miles Assessed 17,513.0 Unassessed 91,254.0 Total Miles 108,767.0

Description of this table Assessed Rivers and Streams 17,513.0 Miles of Assessed Rivers and Streams Attainment Status Miles Good 15,696.9 Threatened 392.9 Impaired 1,423.2 Total Miles Assessed 17,513.0

Description of this table Threatened and Impaired Rivers and Streams 1,816.1 Miles of Threatened and Impaired Rivers and Streams TMDL Development Status Miles All TMDLs completed 532.7 TMDL alternative .0 Non-pollutant impairment 46.3 TMDL needed 1,237.1 Total Threatened and Impaired 1,816.1

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Wyoming 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	11,158.2	100.0	.0	.0
Aquatic Life Other Than Fish	16,745.2	94.4	2.1	3.5
Cold Water Fishery	14,758.9	97.1	1.1	1.9
Drinking Water	228.0	19.3	.0	80.7
Fish Consumption	43.9	100.0	.0	.0
Industry	11,158.2	100.0	.0	.0
Non-Game Fish	170.9	.0	.0	100.0
Recreation	956.0	.0	4.7	95.3
Warm Water Fishery	320.7	53.2	.0	46.8
Wildlife	11,158.2	100.0	.0	.0

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Site-specific Targeted Monitoring Results

Causes of Impairment
Wyoming Rivers and Streams 2012

Cause of Impairment	Cause of Impairment Group	Miles Threatened or Impaired
Fecal Coliform	Pathogens	776.5
Selenium	Metals (other than Mercury)	358.2
Sedimentation/Siltation	Sediment	269.6
Escherichia Coli (E. Coli)	Pathogens	179.5
Physical Substrate Habitat Alterations	Habitat Alterations	176.3
Arsenic	Metals (other than Mercury)	119.9
Chloride	Salinity/Total Dissolved Solids/Chlorides/Sulfates	99.3
Temperature, Water	Temperature	88.8
Manganese	Metals (other than Mercury)	64.2
Oil and Grease	Oil and Grease	46.7
Nutrient/Eutrophication Biological Indicators	Nutrients	40.8
Low Flow Alterations	Flow Alteration(s)	29.3
Copper	Metals (other than Mercury)	17.3
Other Flow Regime Alterations	Flow Alteration(s)	17.0
Ammonia, Un-ionized	Ammonia	16.6
Silver	Metals (other than Mercury)	12.4
Cadmium	Metals (other than Mercury)	12.4
pH	pH/Acidity/Caustic Conditions	10.0

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Site-specific Targeted Monitoring Results

Probable Sources
Wyoming Rivers and Streams 2012

Probable Source	Probable Source Group	Miles Threatened or Impaired
Source Unknown	Unknown	1,204.3
Natural Sources	Natural/Wildlife	476.8
Grazing In Riparian Or Shoreline Zones	Agriculture	370.8
Irrigated Crop Production	Agriculture	306.3
Petroleum/Natural Gas Production Activities (Permitted)	Industrial	170.3
Habitat Modification - Other Than Hydromodification	Habitat Alterations (Not Directly Related To Hydromodification)	54.2
Discharges From Municipal Separate Storm Sewer Systems (Ms4)	Urban-Related Runoff/Stormwater	44.5
Wildlife Other Than Waterfowl	Natural/Wildlife	17.7
Rangeland Grazing	Agriculture	17.7
Subsurface (Hardrock) Mining	Resource Extraction	10.5
Municipal Point Source Discharges	Municipal Discharges/Sewage	10.0
Urban Runoff/Storm Sewers	Urban-Related Runoff/Stormwater	7.6
Impacts From Abandoned Mine Lands (Inactive)	Resource Extraction	6.8
Sources Outside State Jurisdiction Or Borders	Other	6.8

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Site-specific Targeted Monitoring Results

Wyoming Lakes, Reservoirs, and Ponds 2012

Description of this table All Lakes, Reservoirs, and Ponds 325,048.0 Acres of Lakes, Reservoirs, and Ponds Assessed Status Acres Assessed 18,713.0 Unassessed 306,335.0 Total Acres 325,048.0

Description of this table Assessed Lakes, Reservoirs, and Ponds 18,713.0 Acres of Assessed Lakes, Reservoirs, and Ponds Attainment Status Acres Good 12,475.2 Threatened .0 Impaired 6,237.8 Total Acres Assessed 18,713.0

Description of this table Threatened and Impaired Lakes, Reservoirs, and Ponds 6,237.8 Acres of Threatened and Impaired Lakes, Reservoirs, and Ponds TMDL Development Status Acres All TMDLs completed 6,091.2 TMDL alternative .0 Non-pollutant impairment .0 TMDL needed 146.6 Total Threatened and Impaired 6,237.8

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Wyoming 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	12,475.2	100.0	.0	.0
Aquatic Life Other Than Fish	18,713.0	66.7	.0	33.3
Cold Water Fishery	12,490.6	99.9	.0	.1
Fish Consumption	12,049.8	100.0	.0	.0
Industry	12,475.2	100.0	.0	.0
Warm Water Fishery	6,075.8	.0	.0	100.0
Wildlife	12,475.2	100.0	.0	.0

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Site-specific Targeted Monitoring Results

Causes of Impairment
Wyoming Lakes, Reservoirs, and Ponds 2012

Cause of Impairment	Cause of Impairment Group	Acres Threatened or Impaired
Sedimentation/Siltation	Sediment	6,091.2
Selenium	Metals (other than Mercury)	146.6
Phosphate	Nutrients	15.4

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Site-specific Targeted Monitoring Results

Probable Sources
Wyoming Lakes, Reservoirs, and Ponds 2012

Probable Source	Probable Source Group	Acres Threatened or Impaired
Irrigated Crop Production	Agriculture	6,222.4
Source Unknown	Unknown	6,091.2
Natural Sources	Natural/Wildlife	146.6

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Wyoming Causes of Impairment for Reporting Year 2012

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Wyoming Probable Sources Contributing to Impairments
for Reporting Year 2012

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Wyoming 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)
Oil and Grease	1	45

Total: 1 TMDL Alternatives

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Wyoming 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
2012	2	2

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Wyoming 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
Pathogens	73
Metals (other than Mercury)	27
Sediment	7
Habitat Alterations	7
Salinity/Total Dissolved Solids/Chlorides/Sulfates	4
Temperature	4
Nutrients	3
pH/Acidity/Caustic Conditions	2
Ammonia	2
Oil and Grease	1

Total: 130 Causes of Impairment

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Wyoming 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
Fecal Coliform	82	84
Escherichia Coli (E. Coli)	50	50
Total Residual Chlorine	49	52
Chlorine	48	48
Ammonia, Un-ionized	47	48
Ammonia	33	35
Chlorine, Residual (Chlorine Demand)	13	13
Fecal	12	12
Radium 226	8	11
Chlorides	7	7
Iron	5	5
Chloride	4	6
Copper	4	4
Radium	4	4
Sediment	4	4
Arsenic	3	3
Selenium	3	3
Zinc	3	3
Manganese	2	2
Pentachlorophenol (PCP)	2	2
Phenols	2	2
Temperature	2	2
Cadmium	1	1
Chromium IV	1	1
Chromium, Total	1	1
Nitrate	1	1
Nitrates	1	1
Phosphorus	1	1
Silver	1	1
Sulfide	1	1
Total Dissolved Solids (TDS)	1	1

Total: 396 TMDLs; 409 Causes of Impairment Addressed

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Wyoming 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	83	84
1998	9	9
1999	41	41
2000	12	12
2001	10	10
2002	13	13
2003	11	11
2004	71	75
2005	39	39
2006	16	16
2007	30	38
2010	14	14
2011	4	4
2013	3	3
2014	38	38
2016	2	2

Total: 396 TMDLs; 409 Causes of Impairment Addressed

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TMDL Document Search

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