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- Wyoming Assessment Summary
- Water Quality by Waterbody Type
- Causes of Impairment
- Probable Sources Contributing to Impairments
- TMDL Alternatives by Cause of Impairment
- Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
- Causes of Impairment for 303(d) Listed Waters
- Cumulative TMDLs by Pollutant
- Cumulative Number of TMDLs
Data are also available for these cycles:
2002
2004
2006
2008
2012
Waterbody Changes from Prior Cycle
For More Information:
Wyoming Assessment Report
State Water Quality Program
Wyoming Water Quality Assessment Report
Assessed Waters of Wyoming by Watershed
Search for a waterbody within Wyoming
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- Pollution Categories Summary Document
Site-specific Targeted Monitoring Summary Results
Wyoming (2010)
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
||||||||||||||
| Good Waters | 5,960.0 | 12,686.1 | |||||||||||||
| Previously impaired waters now attaining all uses |
32.8 | ||||||||||||||
| Threatened Waters | 191.2 | ||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 191.2 | ||||||||||||||
| Impaired Waters | 1,353.0 | 6,237.6 | |||||||||||||
| TMDL completed | 6.5 | ||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | 43.0 | ||||||||||||||
| TMDL needed | 1,303.5 | 6,237.6 | |||||||||||||
| New TMDLs completed | 73.3 | 6,075.8 | |||||||||||||
| Remaining TMDLs needed | 1,230.2 | 161.8 | |||||||||||||
 |
|||||||||||||||
| Total Assessed Waters | 7,504.2 | 18,923.7 | |||||||||||||
| Total Waters | 108,767.0 | 325,048.0 | |||||||||||||
| Percent of Waters Assessed | 6.9 | 5.8 | |||||||||||||
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2010
Site-specific Targeted Monitoring Results
Wyoming Rivers and Streams 2010
Description of this table
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Wyoming 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 |
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| Agriculture | 16.7 | 100.0 | .0 | .0 | |
| Aquatic Life Other Than Fish | 6,802.9 | 89.6 | 2.2 | 8.2 | |
| Cold Water Fishery | 5,741.5 | 94.0 | 2.3 | 3.7 | |
| Drinking Water | 15.6 | .0 | .0 | 100.0 | |
| Industry | 16.7 | 100.0 | .0 | .0 | |
| Non-Game Fish | 126.8 | 13.7 | .0 | 86.3 | |
| Recreation | 880.2 | .0 | 5.0 | 95.0 | |
| Warm Water Fishery | 344.6 | 48.2 | .0 | 51.8 | |
| Wildlife | 384.3 | 14.8 | .0 | 85.2 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Wyoming Rivers and Streams 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Fecal Coliform | Pathogens | 718.5 |
| Selenium | Metals (other than Mercury) | 371.4 |
| Physical Substrate Habitat Alterations | Habitat Alterations | 166.4 |
| Escherichia Coli (E. Coli) | Pathogens | 161.7 |
| Chloride | Salinity/Total Dissolved Solids/Chlorides/Sulfates | 72.2 |
| Sedimentation/Siltation | Sediment | 60.9 |
| Low Flow Alterations | Flow Alteration(s) | 32.2 |
| Nutrient/Eutrophication Biological Indicators | Nutrients | 30.8 |
| Benthic Macroinvertebrates Bioassessments | Cause Unknown - Impaired Biota | 28.0 |
| Aquatic Macroinvertebrate Bioassessments | Cause Unknown - Impaired Biota | 28.0 |
| Ammonia, Un-ionized | Ammonia | 25.6 |
| Temperature, Water | Temperature | 25.2 |
| Oil and Grease | Oil and Grease | 22.7 |
| Copper | Metals (other than Mercury) | 17.0 |
| Other Flow Regime Alterations | Flow Alteration(s) | 16.5 |
| Manganese | Metals (other than Mercury) | 15.6 |
| Silver | Metals (other than Mercury) | 12.4 |
| Cadmium | Metals (other than Mercury) | 12.4 |
| pH | pH/Acidity/Caustic Conditions | 12.2 |
Site-specific Targeted Monitoring Results
Probable Sources
Wyoming Rivers and Streams 2010
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Source Unknown | Unknown | 989.1 |
| Natural Sources | Natural/Wildlife | 289.3 |
| Irrigated Crop Production | Agriculture | 286.8 |
| Grazing In Riparian Or Shoreline Zones | Agriculture | 148.8 |
| Non-Point Source | Unspecified Nonpoint Source | 109.6 |
| Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 66.9 |
| Habitat Modification - Other Than Hydromodification | Habitat Alterations (Not Directly Related To Hydromodification) | 36.0 |
| Municipal (Urbanized High Density Area) | Urban-Related Runoff/Stormwater | 26.4 |
| Petroleum/Natural Gas Production Activities (Permitted) | Industrial | 25.8 |
| Loss Of Riparian Habitat | Habitat Alterations (Not Directly Related To Hydromodification) | 15.4 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | 12.2 |
| Subsurface (Hardrock) Mining | Resource Extraction | 10.5 |
| Urban Runoff/Storm Sewers | Urban-Related Runoff/Stormwater | 8.4 |
| Impacts From Abandoned Mine Lands (Inactive) | Resource Extraction | 6.5 |
| Sources Outside State Jurisdiction Or Borders | Other | 6.5 |
Site-specific Targeted Monitoring Results
Wyoming Lakes, Reservoirs, and Ponds 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Wyoming 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 | 12,268.2 | 100.0 | .0 | .0 | |
| Aquatic Life Other Than Fish | 18,923.7 | 67.0 | .0 | 33.0 | |
| Cold Water Fishery | 12,701.5 | 99.9 | .0 | .1 | |
| Fish Consumption | 12,268.2 | 100.0 | .0 | .0 | |
| Industry | 12,268.2 | 100.0 | .0 | .0 | |
| Warm Water Fishery | 6,075.8 | .0 | .0 | 100.0 | |
| Wildlife | 12,414.6 | 98.8 | .0 | 1.2 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Wyoming Lakes, Reservoirs, and Ponds 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
|---|---|---|
| Sedimentation/Siltation | Sediment | 6,091.2 |
| Selenium | Metals (other than Mercury) | 146.4 |
| Phosphate | Nutrients | 15.4 |
Site-specific Targeted Monitoring Results
Probable Sources
Wyoming Lakes, Reservoirs, and Ponds 2010
Description of this table
| Probable Source | Probable Source Group | Acres Threatened or Impaired |
|---|---|---|
| Irrigated Crop Production | Agriculture | 6,221.2 |
| Non-Point Source | Unspecified Nonpoint Source | 6,091.2 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | 15.4 |
| Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 15.4 |
Wyoming 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) |
||||||||||||||
| Ammonia | 25.6 | ||||||||||||||
| Cause Unknown - Impaired Biota | 28.0 | ||||||||||||||
| Flow Alteration(s) | 48.7 | ||||||||||||||
| Habitat Alterations | 166.4 | ||||||||||||||
| Metals (other than Mercury) | 404.0 | 146.4 | |||||||||||||
| Nutrients | 30.8 | 15.4 | |||||||||||||
| Oil and Grease | 22.7 | ||||||||||||||
| Pathogens | 880.2 | ||||||||||||||
| pH/Acidity/Caustic Conditions | 12.2 | ||||||||||||||
| Salinity/Total Dissolved Solids/Chlorides/Sulfates | 72.2 | ||||||||||||||
| Sediment | 60.9 | 6,091.2 | |||||||||||||
| Temperature | 25.2 | ||||||||||||||
Wyoming 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 | 435.7 | 6,221.2 | |||||||||||||
| Habitat Alterations (Not Directly Related To Hydromodification) | 51.4 | ||||||||||||||
| Industrial | 25.8 | ||||||||||||||
| Municipal Discharges/Sewage | 12.2 | 15.4 | |||||||||||||
| Natural/Wildlife | 289.3 | ||||||||||||||
| Other | 6.5 | ||||||||||||||
| Resource Extraction | 17.0 | ||||||||||||||
| Unknown | 989.1 | ||||||||||||||
| Unspecified Nonpoint Source | 109.6 | 6,091.2 | |||||||||||||
| Urban-Related Runoff/Stormwater | 101.7 | 15.4 | |||||||||||||
Wyoming 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) |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Oil and Grease |  1 |
21 | ||||||||||||
Total: 1 TMDL Alternatives
Wyoming 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 |
|---|---|---|
| 2012 | 2 |
2 |
Wyoming 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 |
|---|---|
| Pathogens | 71 |
| Metals (other than Mercury) | 27 |
| Habitat Alterations | 12 |
| Sediment | 6 |
| Salinity/Total Dissolved Solids/Chlorides/Sulfates | 4 |
| Nutrients | 3 |
| pH/Acidity/Caustic Conditions | 2 |
| Ammonia | 2 |
| Cause Unknown - Impaired Biota | 2 |
| Temperature | 2 |
| Oil and Grease | 1 |
| Flow Alteration(s) | 1 |
Total: 133 Causes of Impairment
Wyoming 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 |
|---|---|---|
| Fecal Coliform |  82 |
84 |
| Total Residual Chlorine | 49 |
52 |
| Chlorine | 48 |
48 |
| Ammonia, Un-ionized | 47 |
48 |
| Ammonia | 32 |
34 |
| Chlorine, Residual (Chlorine Demand) | 13 |
13 |
| Escherichia Coli (E. Coli) | 12 |
12 |
| Fecal | 12 |
12 |
| Radium 226 | 8 |
11 |
| Chlorides | 7 |
7 |
| Iron | 5 |
5 |
| Copper | 4 |
4 |
| Radium | 4 |
4 |
| Arsenic | 3 |
3 |
| Chloride | 3 |
5 |
| Sediment | 3 |
3 |
| Zinc | 3 |
3 |
| Manganese | 2 |
2 |
| Pentachlorophenol (PCP) | 2 |
2 |
| Phenols | 2 |
2 |
| Selenium | 2 |
2 |
| Temperature | 2 |
2 |
| Cadmium | 1 |
1 |
| Chromium IV | 1 |
1 |
| Chromium, Total | 1 |
1 |
| Nitrate | 1 |
1 |
| Nitrates | 1 |
1 |
| Silver | 1 |
1 |
| Sulfide | 1 |
1 |
| Total Dissolved Solids (TDS) | 1 |
1 |
Total: 353 TMDLs; 366 Causes of Impairment Addressed
Wyoming 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 | 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 |
Total: 353 TMDLs; 366 Causes of Impairment Addressed