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Assessment Data for the State of Iowa Year 2008
National Assessment Database
-
Total Assessed Waters of Iowa
-
Assessed Waters of Iowa by Watershed (8 Digit USGS Cataloging Unit)
- Water Quality by Waterbody Type
- Rivers, Streams, and Creeks
- Lakes, Ponds, and Reservoirs
- Wetlands
- Causes of Impairment
- Probable Sources Contributing to Impairment
- Glossary
State of Iowa websites: |
State 305(b) Water Quality Assessment Report(s) |
Search for a Waterbody within Iowa
Total Assessed Waters for the State of Iowa
Description of this table| Size Of Water | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers, Streams, Creeks (Miles) | Lakes, Ponds, Reservoir (Acres) | Bays, Estuaries (Square Miles) | Coastal Shorelines (Miles) | Oceans, Near Coastal Waters (Square Miles) | Wetlands (Acres) | Great Lakes Shoreline (Miles) | Great Lakes Open Water (Square Miles) | Great Lakes Connecting Channel (Miles) | Inland Lake Shoreline (Miles) | ||
| Total Assessed Waters | 9,512.20 | 88,081.20 | .00 | .00 | .00 | 36,574.00 | .00 | .00 | .00 | .00 | |
| Estimated Total Water Size in IA | 71,665.00 | 202,216.00 | Unavailable | Unavailable | Unavailable | 125,155.00 | Unavailable | Unavailable | Unavailable | Unavailable | |
| Percent of Waters Assessed | 13.27 | 43.56 | Unavailable | Unavailable | Unavailable | 29.22 | Unavailable | Unavailable | Unavailable | Unavailable | |
Assessed Waters of Iowa by Watershed (8 Digit USGS Cataloging Unit)
Description of this tableIowa Assessed Waters
Individual Use Support for Rivers and Streams
Description of this table
| State Designated Use | Total Miles Assessed | Percent Good | Percent Threatened | Percent Impaired |  % Good |
|---|---|---|---|---|---|
 % Threatened |
|||||
 % Impaired |
|||||
| Aquatic Life | 9,147.20 | 47.17 | .35 | 52.48 | |
| Drinking Water | 209.50 | 35.08 | .00 | 64.92 | |
| Fish Consumption | 1,808.80 | 88.25 | .00 | 11.75 | |
| Primary Body Contact | 3,263.00 | 13.33 | .00 | 86.67 | |
| Secondary Contact Rec. | 191.00 | 89.53 | .00 | 10.47 | |
Iowa Assessed Waters
Overall Water Quality Attainment for Rivers and Streams
Description of this table
| Attainment Status | Miles | Percent of Assessed |
| Good | 2,972.40 | 31.25 |
| Threatened | .00 | .00 |
| Impaired | 6,539.80 | 68.75 |
| Total Miles Assessed | 9,512.20 | 100.00 |
Iowa Top Causes of Impairments
for Rivers and Streams
Description of this table
| # | State Cause Name | Total Miles Impaired |
|---|---|---|
| 1 | PATHOGENS | 2,617.50 |
| 2 | CAUSE UNKNOWN | 1,680.50 |
| 3 | DIRECT HABITAT ALTERATIONS | 1,407.20 |
| 4 | SEDIMENTATION/SILTATION | 907.20 |
| 5 | ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN | 736.80 |
| 6 | AMMONIA, UN-IONIZED | 720.50 |
| 7 | NUTRIENTS | 533.50 |
| 8 | FLOW ALTERATION(S) | 360.90 |
| 9 | MERCURY | 212.60 |
| 10 | UNKNOWN TOXICITY | 112.30 |
Iowa Top Probable Sources of Impairments
for Rivers and Streams
Description of this table
| # | State Source Name | Total Miles Impaired by Source |
|---|---|---|
| 1 | SOURCE UNKNOWN | 4,406.50 |
| 2 | AGRICULTURE | 937.60 |
| 3 | HYDROMODIFICATION | 776.50 |
| 4 | CHANNELIZATION | 589.60 |
| 5 | HABITAT MODIFICATION - OTHER THAN HYDROMODIFICATION | 587.00 |
| 6 | STREAMBANK MODIFICATIONS/DESTABILIZATION | 482.00 |
| 7 | NATURAL SOURCES | 443.50 |
| 8 | LOSS OF RIPARIAN HABITAT | 385.80 |
| 9 | INTENSIVE ANIMAL FEEDING OPERATIONS | 306.60 |
| 10 | IMPACTS FROM HYDROSTRUCTURE FLOW REGULATION/MODIFICATION | 273.20 |
Iowa Assessed Waters
Individual Use Support for Lakes, Ponds and Reservoirs
Description of this table
| State Designated Use | Total Acres Assessed | Percent Good | Percent Threatened | Percent Impaired | % Good |
|---|---|---|---|---|---|
| % Threatened |
|||||
| % Impaired |
|||||
| Aquatic Life | 86,645.20 | 72.58 | .00 | 27.42 | |
| Drinking Water | 17,885.00 | 84.81 | .53 | 14.65 | |
| Fish Consumption | 72,949.00 | 98.85 | .00 | 1.15 | |
| Primary Body Contact | 82,360.00 | 42.58 | .97 | 56.45 | |
Iowa Assessed Waters
Overall Water Quality Attainment for Lakes, Ponds and Reservoirs
Description of this table
| Attainment Status | Acres | Percent of Assessed |
| Good | 37,465.00 | 42.53 |
| Threatened | 95.00 | .11 |
| Impaired | 50,521.20 | 57.36 |
| Total Acres Assessed | 88,081.20 | 100.00 |
Iowa Top Causes of Impairments
for Lakes, Ponds and Reservoirs
Description of this table
| # | State Cause Name | Total Acres Impaired |
|---|---|---|
| 1 | TURBIDITY | 38,173.00 |
| 2 | CHLOROPHYLL-A | 26,178.00 |
| 3 | EXCESS ALGAL GROWTH | 26,178.00 |
| 4 | PATHOGENS | 19,622.00 |
| 5 | NOXIOUS AQUATIC PLANTS | 17,400.00 |
| 6 | TOTAL SUSPENDED SOLIDS (TSS) | 14,651.00 |
| 7 | NUTRIENTS | 13,649.00 |
| 8 | PH | 5,012.00 |
| 9 | OTHER CAUSE | 4,949.00 |
| 10 | ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN | 4,247.20 |
Iowa Top Probable Sources of Impairments
for Lakes, Ponds and Reservoirs
Description of this table
| # | State Source Name | Total Acres Impaired by Source |
|---|---|---|
| 1 | SEDIMENT RESUSPENSION | 38,073.00 |
| 2 | INTERNAL NUTRIENT RECYCLING | 34,745.00 |
| 3 | NATURAL SOURCES | 25,320.20 |
| 4 | AGRICULTURE | 23,189.00 |
| 5 | SOURCE UNKNOWN | 22,107.00 |
| 6 | URBAN RUNOFF/STORM SEWERS | 857.00 |
| 7 | WASTE STORAGE/STORAGE TANK LEAKS | 370.00 |
| 8 | CONSTRUCTION | 172.00 |
| 9 | OTHER | 59.00 |
| 10 | PETROLEUM/NATURAL GAS ACTIVITIES | 59.00 |
Iowa Assessed Waters
Individual Use Support for Wetlands
Description of this table
| State Designated Use | Total Acres Assessed | Percent Good | Percent Threatened | Percent Impaired | % Good |
|---|---|---|---|---|---|
| % Threatened |
|||||
| % Impaired |
|||||
| Aquatic Life | 36,574.00 | 49.85 | .00 | 50.15 | |
| Fish Consumption | 108.00 | 100.00 | .00 | .00 | |
Iowa Assessed Waters
Overall Water Quality Attainment for Wetlands
Description of this table
| Attainment Status | Acres | Percent of Assessed |
| Good | 18,233.00 | 49.85 |
| Threatened | .00 | .00 |
| Impaired | 18,341.00 | 50.15 |
| Total Acres Assessed | 36,574.00 | 100.00 |
Iowa Top Causes of Impairments
for Wetlands
Description of this table
| # | State Cause Name | Total Acres Impaired |
|---|---|---|
| 1 | SEDIMENTATION/SILTATION | 13,376.00 |
| 2 | FLOW ALTERATION(S) | 4,210.00 |
| 3 | EXOTIC SPECIES | 4,200.00 |
| 4 | NUTRIENTS | 1,537.00 |
| 5 | CHLOROPHYLL-A | 1,067.00 |
| 6 | EXCESS ALGAL GROWTH | 1,067.00 |
| 7 | TURBIDITY | 965.00 |
| 8 | NOXIOUS AQUATIC PLANTS | 940.00 |
| 9 | CAUSE UNKNOWN | 665.00 |
| 10 | ORGANIC ENRICHMENT/LOW DISSOLVED OXYGEN | 391.00 |
Iowa Top Probable Sources of Impairments
for Wetlands
Description of this table
| # | State Source Name | Total Acres Impaired by Source |
|---|---|---|
| 1 | NATURAL SOURCES | 15,118.00 |
| 2 | STREAMBANK MODIFICATIONS/DESTABILIZATION | 8,491.00 |
| 3 | AGRICULTURE | 7,766.00 |
| 4 | NON-IRRIGATED CROP PRODUCTION | 6,047.00 |
| 5 | SOURCE UNKNOWN | 4,516.00 |
| 6 | HYDROMODIFICATION | 4,227.00 |
| 7 | CROP-RELATED SOURCES | 1,323.00 |
| 8 | IMPACTS FROM HYDROSTRUCTURE FLOW REGULATION/MODIFICATION | 1,081.00 |
| 9 | INTERNAL NUTRIENT RECYCLING | 1,067.00 |
| 10 | SEDIMENT RESUSPENSION | 965.00 |
Iowa
Causes of Impairment
Description of this table| State Cause Name | Size of Assessed Waters with Listed Causes of Impairment | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers, Streams, Creeks (Miles) | Lakes, Ponds, Reservoir (Acres) | Bays, Estuaries (Square Miles) | Coastal Shorelines (Miles) | Oceans, Near Coastal Waters (Square Miles) | Wetlands (Acres) | Great Lakes Shoreline (Miles) | Great Lakes Open Water (Square Miles) | Great Lakes Connecting Channel (Miles) | Inland Lake Shoreline (Miles) | ||
| Ammonia, Un-ionized | 720.50 | 3,152.00 | 140.00 | ||||||||
| Arsenic | 72.60 | ||||||||||
| Atrazine | 1,822.00 | ||||||||||
| Cause Unknown | 1,680.50 | 1,694.00 | 665.00 | ||||||||
| Chlorine | 2.20 | ||||||||||
| Chlorophyll-A | 27.60 | 26,178.00 | 1,067.00 | ||||||||
| Copper | 51.00 | ||||||||||
| Direct Habitat Alterations | 1,407.20 | 237.00 | |||||||||
| Excess Algal Growth | 27.60 | 26,178.00 | 1,067.00 | ||||||||
| Exotic Species | 338.00 | 4,200.00 | |||||||||
| Flow Alteration(s) | 360.90 | 4,210.00 | |||||||||
| Lead | 21.60 | ||||||||||
| Mercury | 212.60 | 129.00 | |||||||||
| Metals | 104.20 | ||||||||||
| Nitrates | 63.40 | ||||||||||
| Noxious Aquatic Plants | 4.30 | 17,400.00 | 940.00 | ||||||||
| Nutrients | 533.50 | 13,649.00 | 1,537.00 | ||||||||
| Oil and Grease | 59.00 | ||||||||||
| Organic Enrichment/Low Dissolved Oxygen | 736.80 | 4,247.20 | 391.00 | ||||||||
| Other Cause | 65.40 | 4,949.00 | 371.00 | ||||||||
| Other Inorganics | 27.00 | ||||||||||
| Pathogens | 2,617.50 | 19,622.00 | |||||||||
| Pesticides | 14.80 | ||||||||||
| Phosphorus, Total | 3.30 | ||||||||||
| Polychlorinated Biphenyls (PCBs) | 522.00 | ||||||||||
| Priority Organics Compounds | 5.50 | ||||||||||
| Sedimentation/Siltation | 907.20 | 3,813.00 | 13,376.00 | ||||||||
| Thermal Modifications | 4.10 | ||||||||||
| Total Suspended Solids (TSS) | 26.00 | 14,651.00 | 225.00 | ||||||||
| Turbidity | 22.00 | 38,173.00 | 965.00 | ||||||||
| Unknown Toxicity | 112.30 | ||||||||||
| pH | 5,012.00 | ||||||||||
Iowa
Probable Sources Contributing to Impairment
Description of this table| State Source Name | Size of Assessed Waters with Probable Sources of Impairment | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers, Streams, Creeks (Miles) | Lakes, Ponds, Reservoir (Acres) | Bays, Estuaries (Square Miles) | Coastal Shorelines (Miles) | Oceans, Near Coastal Waters (Square Miles) | Wetlands (Acres) | Great Lakes Shoreline (Miles) | Great Lakes Open Water (Square Miles) | Great Lakes Connecting Channel (Miles) | Inland Lake Shoreline (Miles) | ||
| Agriculture | 937.60 | 23,189.00 | 7,766.00 | ||||||||
| Animal Feeding Operations (Nps) | 109.00 | ||||||||||
| Channelization | 589.60 | ||||||||||
| Construction | 172.00 | ||||||||||
| Crop-Related Sources | 101.50 | 22.00 | 1,323.00 | ||||||||
| Habitat Modification - Other Than Hydromodification | 587.00 | ||||||||||
| Hazardous Waste | 2.00 | ||||||||||
| Hydromodification | 776.50 | 4,227.00 | |||||||||
| Impacts From Hydrostructure Flow Regulation/Modification | 273.20 | 1,081.00 | |||||||||
| Industrial Point Source Discharge | 39.60 | 140.00 | |||||||||
| Intensive Animal Feeding Operations | 306.60 | 702.00 | |||||||||
| Internal Nutrient Recycling | 34,745.00 | 1,067.00 | |||||||||
| Land Disposal | 2.00 | ||||||||||
| Livestock (Grazing Or Feeding Operations) | 111.70 | ||||||||||
| Loss Of Riparian Habitat | 385.80 | ||||||||||
| Minor Municipal Point Source | 3.30 | ||||||||||
| Municipal Point Source Discharges | 149.10 | ||||||||||
| Natural Sources | 443.50 | 25,320.20 | 15,118.00 | ||||||||
| Non-Irrigated Crop Production | 6,047.00 | ||||||||||
| Other | 59.00 | 237.00 | |||||||||
| Pasture Grazing - Riparian | 167.10 | ||||||||||
| Pasture Grazing - Riparian And/Or Upland | 14.00 | ||||||||||
| Petroleum/Natural Gas Activities | 59.00 | ||||||||||
| Resource Extraction | 25.00 | ||||||||||
| Sediment Resuspension | 38,073.00 | 965.00 | |||||||||
| Source Unknown | 4,406.50 | 22,107.00 | 4,516.00 | ||||||||
| Spills | 263.40 | ||||||||||
| Streambank Modifications/Destabilization | 482.00 | 8,491.00 | |||||||||
| Surface Mining | 21.70 | ||||||||||
| Upstream Impoundments (E.G., Pl-566 Nrcs Structures) | 3.30 | ||||||||||
| Urban Runoff/Storm Sewers | 10.40 | 857.00 | |||||||||
| Waste Storage/Storage Tank Leaks | 370.00 | ||||||||||
| Wastewater | 30.00 | ||||||||||
| Waterfowl | 2.50 | ||||||||||
