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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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Idaho Water Quality Assessment Report

Assessed Waters of Idaho by Watershed

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Display impaired waters and TMDL information only



Site-specific Targeted Monitoring Summary Results

Idaho (2012)

Description of this table
 
    28,638.9 27,683.3
       851.6 1,648.2
    47.6
           47.6     
                
                
                
    34,398.5 261,709.1
           20,375.0     55,704.1
           39.7     
           614.1     1,913.7
           13,369.7     204,091.3
              435.8     .0
                    12,933.9           204,091.3
63,085.0 289,392.4
96,391.0 475,457.4
65.4 60.9

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


Site-specific Targeted Monitoring Results

Idaho Rivers and Streams 2012

Description of this table

All
Rivers and Streams

96,391.0 Miles of Rivers and Streams

Assessed 63,085.0
Unassessed 33,306.1
Total Miles 96,391.0







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Description of this table

Assessed
Rivers and Streams

63,085.0 Miles of
Assessed Rivers and Streams

Good 28,638.9
Threatened 47.6
Impaired 34,398.5
Total Miles Assessed 63,085.0







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Description of this table

Threatened and Impaired
Rivers and Streams

34,446.0 Miles of
Threatened and Impaired
Rivers and Streams

20,858.4
39.7
614.1
12,933.9
Total Threatened and Impaired 34,446.0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Idaho 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
Aesthetic 5,367.0 100.0 .0 .0 color.gif
Agricultural Water Supply 6,783.0 99.1 .0 .9 color.gifcolor.gif
Cold Water Aquatic Life 61,053.3 47.4 .1 52.5 color.gifcolor.gifcolor.gif
Domestic Water Supply 4,050.0 96.8 .0 3.2 color.gifcolor.gif
Industrial Water Supply 6,613.4 100.0 .0 .0 color.gif
Modified Aquatic Life 3.7 .0 .0 100.0 color.gif
Primary Contact Recreation 16,494.5 81.7 .0 18.3 color.gifcolor.gif
Salmonid Spawning 33,383.9 54.0 .2 45.9 color.gifcolor.gifcolor.gif
Seasonal Cold Water Aquatic Life 13.5 100.0 .0 .0 color.gif
Secondary Contact Recreation 25,936.3 84.7 .0 15.3 color.gifcolor.gif
Undesignated Surface Waters 19.8 .0 .0 100.0 color.gif
Warm Water Aquatic Life 148.4 32.0 .0 68.0 color.gifcolor.gif
Wildlife Habitat 6,923.6 100.0 .0 .0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Idaho Rivers and Streams 2012

Description of this table
Temperature, Water Temperature color.gif 18,494.0
Sedimentation/Siltation Sediment color.gif 14,988.3
Phosphorus, Total Nutrients color.gif 6,016.5
Escherichia Coli (E. Coli) Pathogens color.gif 4,480.1
Combined Biota/Habitat Bioassessments (Streams) Cause Unknown - Impaired Biota color.gif 4,305.6
Other Flow Regime Alterations Flow Alteration(s) color.gif 3,876.5
Physical Substrate Habitat Alterations Habitat Alterations color.gif 3,613.4
Total Suspended Solids (TSS) Turbidity color.gif 2,797.3
Fecal Coliform Pathogens color.gif 2,283.7
Low Flow Alterations Flow Alteration(s) color.gif 1,897.6
Nutrient/Eutrophication Biological Indicators Nutrients color.gif 1,109.6
Cause Unknown Cause Unknown color.gif 1,001.6
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 973.9
Nitrogen, Total Nutrients color.gif 559.1
Oil and Grease Oil and Grease color.gif 502.9
Ammonia, Un-ionized Ammonia color.gif 457.9
Zinc Metals (other than Mercury) color.gif 342.6
Cadmium Metals (other than Mercury) color.gif 338.4
Mercury Mercury color.gif 313.1
Lead Metals (other than Mercury) color.gif 271.5
Habitat Assessment (Streams) Cause Unknown - Impaired Biota color.gif 256.0
Fish Bioassessments Cause Unknown - Impaired Biota color.gif 226.9
Selenium Metals (other than Mercury) color.gif 152.1
Dissolved Gas Supersaturation Other Cause color.gif 149.7
Benthic Macroinvertebrates Bioassessments Cause Unknown - Impaired Biota color.gif 139.3
Chlorpyrifos Pesticides color.gif 108.4
Nitrogen, Nitrate Nutrients color.gif 93.1
Copper Metals (other than Mercury) color.gif 42.9
Arsenic Metals (other than Mercury) color.gif 41.0
Malathion Pesticides color.gif 29.8
Methyl Parathion Pesticides color.gif 19.7
Aquatic Plant Bioassessments Cause Unknown - Impaired Biota color.gif 9.7
pH pH/Acidity/Caustic Conditions color.gif 7.9
Antimony Toxic Inorganics color.gif 5.4
High Flow Regime Flow Alteration(s) color.gif 4.9
Aquatic Plants (Macrophytes) Noxious Aquatic Plants color.gif 4.7
Particle Distribution (Embeddedness) Sediment color.gif 2.5

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Site-specific Targeted Monitoring Results

Probable Sources
Idaho Rivers and Streams 2012

Description of this table
Grazing In Riparian Or Shoreline Zones Agriculture color.gif 2,230.3
Rangeland Grazing Agriculture color.gif 1,782.4
Livestock (Grazing Or Feeding Operations) Agriculture color.gif 1,151.7
Flow Alterations From Water Diversions Hydromodification color.gif 643.1
Loss Of Riparian Habitat Habitat Alterations (Not Directly Related To Hydromodification) color.gif 607.9
Managed Pasture Grazing Agriculture color.gif 560.6
Impacts From Hydrostructure Flow Regulation/Modification Hydromodification color.gif 535.6
Channelization Hydromodification color.gif 500.5
Irrigated Crop Production Agriculture color.gif 416.6
Streambank Modifications/Destabilization Hydromodification color.gif 372.8
Source Unknown Unknown color.gif 327.8
Silviculture Activities Silviculture (Forestry) color.gif 313.6
Natural Sources Natural/Wildlife color.gif 311.6
Agriculture Agriculture color.gif 299.8
Impacts From Abandoned Mine Lands (Inactive) Resource Extraction color.gif 266.9
Upstream Impoundments (E.G., Pl-566 Nrcs Structures) Hydromodification color.gif 260.4
Highway/Road/Bridge Runoff (Non-Construction Related) Urban-Related Runoff/Stormwater color.gif 244.1
Placer Mining Resource Extraction color.gif 224.3
Forest Roads (Road Construction And Use) Silviculture (Forestry) color.gif 213.6
Habitat Modification - Other Than Hydromodification Habitat Alterations (Not Directly Related To Hydromodification) color.gif 135.0
Crop Production (Crop Land Or Dry Land) Agriculture color.gif 106.4
Construction Stormwater Discharge (Permitted) Construction color.gif 69.7
Highways, Roads, Bridges, Infrastructure (New Construction) Construction color.gif 68.9
Municipal Point Source Discharges Municipal Discharges/Sewage color.gif 63.9
Dam Construction (Other Than Upstream Flood Control Projects) Hydromodification color.gif 61.5
Animal Feeding Operations (Nps) Agriculture color.gif 53.1
Surface Mining Resource Extraction color.gif 49.5
Site Clearance (Land Development Or Redevelopment) Construction color.gif 39.6
Mill Tailings Industrial color.gif 39.3
Sources Outside State Jurisdiction Or Borders Other color.gif 37.9
Acid Mine Drainage Resource Extraction color.gif 31.2
Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) Municipal Discharges/Sewage color.gif 31.2
Dredging (E.G., For Navigation Channels) Hydromodification color.gif 30.9
Mine Tailings Resource Extraction color.gif 28.2
Non-Irrigated Crop Production Agriculture color.gif 20.6
Aquaculture (Permitted) Aquaculture color.gif 14.3
Post-Development Erosion And Sedimentation Hydromodification color.gif 10.4
Other Recreational Pollution Sources Recreation And Tourism (Non-Boating) color.gif 9.4
Subsurface (Hardrock) Mining Resource Extraction color.gif 2.0
Dredge Mining Resource Extraction color.gif 2.0

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Site-specific Targeted Monitoring Results

Idaho Lakes, Reservoirs, and Ponds 2012

Description of this table

All
Lakes, Reservoirs, and Ponds

475,457.4 Acres of Lakes, Reservoirs, and Ponds

Assessed 289,392.4
Unassessed 186,065.1
Total Acres 475,457.4







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Description of this table

Assessed
Lakes, Reservoirs, and Ponds

289,392.4 Acres of
Assessed Lakes, Reservoirs, and Ponds

Good 27,683.3
Threatened .0
Impaired 261,709.1
Total Acres Assessed 289,392.4







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Description of this table

Threatened and Impaired
Lakes, Reservoirs, and Ponds

261,709.1 Acres of
Threatened and Impaired
Lakes, Reservoirs, and Ponds

55,704.1
.0
1,913.7
204,091.3
Total Threatened and Impaired 261,709.1

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Idaho 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
Aesthetic 5,545.8 100.0 .0 .0 color.gif
Agricultural Water Supply 3,493.7 100.0 .0 .0 color.gif
Cold Water Aquatic Life 278,492.1 8.7 .0 91.3 color.gifcolor.gif
Domestic Water Supply 902.5 100.0 .0 .0 color.gif
Industrial Water Supply 3,310.2 100.0 .0 .0 color.gif
Primary Contact Recreation 61,186.9 97.4 .0 2.6 color.gifcolor.gif
Salmonid Spawning 93,957.9 14.0 .0 86.0 color.gifcolor.gif
Seasonal Cold Water Aquatic Life 965.2 .0 .0 100.0 color.gif
Secondary Contact Recreation 122,645.9 3.0 .0 97.0 color.gifcolor.gif
Undesignated Surface Waters 203.4 .0 .0 100.0 color.gif
Warm Water Aquatic Life 6,096.7 .6 .0 99.4 color.gifcolor.gif
Wildlife Habitat 5,590.1 100.0 .0 .0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Idaho Lakes, Reservoirs, and Ponds 2012

Description of this table
Phosphorus, Total Nutrients color.gif 146,575.7
Mercury Mercury color.gif 121,329.0
Other Flow Regime Alterations Flow Alteration(s) color.gif 84,681.8
Sedimentation/Siltation Sediment color.gif 80,169.1
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 77,472.8
Nutrient/Eutrophication Biological Indicators Nutrients color.gif 55,595.2
Chlorophyll-A Algal Growth color.gif 55,509.3
Lead Metals (other than Mercury) color.gif 29,839.9
Zinc Metals (other than Mercury) color.gif 28,423.1
Cadmium Metals (other than Mercury) color.gif 27,262.0
pH pH/Acidity/Caustic Conditions color.gif 25,039.5
Temperature, Water Temperature color.gif 21,739.9
Dissolved Gas Supersaturation Other Cause color.gif 3,616.4
Total Suspended Solids (TSS) Turbidity color.gif 1,907.5
Low Flow Alterations Flow Alteration(s) color.gif 1,045.1
Escherichia Coli (E. Coli) Pathogens color.gif 506.2
Physical Substrate Habitat Alterations Habitat Alterations color.gif 86.0
Nitrogen, Total Nutrients color.gif 67.4

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Site-specific Targeted Monitoring Results

Probable Sources
Idaho Lakes, Reservoirs, and Ponds 2012

Description of this table
Agriculture Agriculture color.gif 340.4
Natural Sources Natural/Wildlife color.gif 340.4
Loss Of Riparian Habitat Habitat Alterations (Not Directly Related To Hydromodification) color.gif 340.4
Post-Development Erosion And Sedimentation Hydromodification color.gif 340.4
Highways, Roads, Bridges, Infrastructure (New Construction) Construction color.gif 340.4
Construction Stormwater Discharge (Permitted) Construction color.gif 340.4

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Idaho 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 55,509.3
Ammonia 457.9
Cause Unknown 1,001.6
Cause Unknown - Impaired Biota 4,572.5
Flow Alteration(s) 5,754.9 85,726.9
Habitat Alterations 3,613.4 86.0
Mercury 313.1 121,329.0
Metals (other than Mercury) 545.2 29,839.9
Noxious Aquatic Plants 4.7
Nutrients 7,173.9 202,171.0
Oil and Grease 502.9
Organic Enrichment/Oxygen Depletion 973.9 77,472.8
Other Cause 149.7 3,616.4
Pathogens 6,715.7 506.2
Pesticides 128.1
pH/Acidity/Caustic Conditions 7.9 25,039.5
Sediment 14,988.3 80,169.1
Temperature 18,494.0 21,739.9
Toxic Inorganics 5.4
Turbidity 2,797.3 1,907.5

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Idaho 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 4,332.2 340.4
Aquaculture 14.3
Construction 115.1 340.4
Habitat Alterations (Not Directly Related To Hydromodification) 636.7 340.4
Hydromodification 1,248.1 340.4
Industrial 39.3
Municipal Discharges/Sewage 82.1
Natural/Wildlife 311.6 340.4
Other 37.9
Recreation And Tourism (Non-Boating) 9.4
Resource Extraction 326.9
Silviculture (Forestry) 474.7
Unknown 327.8
Urban-Related Runoff/Stormwater 244.1

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Idaho 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.
Sedimentation/Siltation color.gif 4 51

Total: 4 TMDL Alternatives

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Idaho 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.
2009 color.gif 26 33
2011 color.gif 15 22
2014 color.gif 20 21

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Idaho 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.
Temperature color.gif 277
Cause Unknown - Impaired Biota color.gif 179
Pathogens color.gif 161
Sediment color.gif 141
Metals (other than Mercury) color.gif 117
Cause Unknown color.gif 58
Mercury color.gif 23
Nutrients color.gif 11
Organic Enrichment/Oxygen Depletion color.gif 10
Pesticides color.gif 8
Ammonia color.gif 8
Oil and Grease color.gif 8
Other Cause color.gif 5
Turbidity color.gif 2
Toxic Inorganics color.gif 2
pH/Acidity/Caustic Conditions color.gif 1

Total: 1,011 Causes of Impairment

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Idaho 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
Temperature color.gif 785 787
Sediment color.gif 439 444
Total Suspended Solids (TSS) color.gif 163 163
Phosphorus, Total color.gif 133 141
Nutrients color.gif 111 111
Phosphorus color.gif 92 96
Escherichia Coli (E. Coli) color.gif 79 79
Cadmium color.gif 60 60
Zinc color.gif 60 60
Lead color.gif 57 57
Bacteria color.gif 50 50
Dissolved Oxygen color.gif 26 26
Pathogens color.gif 18 18
Enterococcus Bacteria color.gif 10 10
Suspended Sediment color.gif 6 6
Total Dissolved Gas color.gif 6 6
DDD color.gif 5 5
DDE color.gif 5 5
DDT color.gif 5 5
Dieldrin color.gif 5 5
Nitrite/Nitrate color.gif 5 5
Erosion color.gif 4 4
Nitrogen, Total color.gif 4 4
Ammonia color.gif 3 3
Copper color.gif 3 3
Nitrogen color.gif 3 3
Oil and Grease color.gif 2 2
Total Inorganic Nitrogen color.gif 2 2
Turbidity color.gif 2 2
Chlorophyll-A color.gif 1 1
Mercury color.gif 1 1

Total: 2,145 TMDLs; 2,164 Causes of Impairment Addressed


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Idaho 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.
1996 color.gif 4 4
1997 color.gif 14 14
1998 color.gif 5 5
1999 color.gif 19 21
2000 color.gif 374 374
2001 color.gif 72 75
2002 color.gif 82 82
2003 color.gif 120 120
2004 color.gif 240 242
2005 color.gif 160 160
2006 color.gif 146 150
2007 color.gif 50 50
2008 color.gif 232 232
2009 color.gif 93 93
2010 color.gif 84 84
2011 color.gif 36 37
2012 color.gif 183 183
2013 color.gif 88 95
2014 color.gif 106 106
2015 color.gif 37 37

Total: 2,145 TMDLs; 2,164 Causes of Impairment Addressed

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Idaho Cumulative Number of TMDLs for Indian Country Waters

EPA Fiscal Year starts October 1 and ends September 30.


Description of this table
NOTE:Click on the underlined "Number of TMDLs" value for a detailed list of the TMDLs for the fiscal year.
Fiscal Year Number of TMDLs Number of Causes of
Impairment Addressed
1999 color.gif 9 9
2000 color.gif 124 124
2004 color.gif 11 17
2005 color.gif 1 10
2011 color.gif 1 1
2012 color.gif 36 36

Total: 182 TMDLs; 0 Causes of Impairment



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