{ "dataset": "Iowa lake-type waterbodies reported to EPA ATTAINS", "scope": "Every lake-type assessment unit Iowa reports, not only those with a page on plainlakes.com.", "state": { "code": "IA", "name": "Iowa", "url": "https://plainlakes.com/state/iowa/" }, "reporting_cycles": "2024", "count": 371, "sources": [ { "source": "EPA ATTAINS", "vintage": "Reporting cycles 1987–2026" }, { "source": "USGS National Water Information System", "vintage": "Trailing 365 days, through 2026-08-16" } ], "license": "https://plainlakes.com/terms/", "attribution": "PlainLakes (plainlakes.com), compiled from EPA ATTAINS and USGS NWIS", "disclaimer": "Assessment verdicts are the decisions of the state agency or tribal nation that filed them, as published to EPA ATTAINS, and are reproduced without modification. PlainLakes is not affiliated with the federal government.", "waterbodies": [ { "assessment_unit_id": "IA 04-LDM-1017", "name": "Red Rock Reservoir", "water_type": "Reservoir", "size": { "value": 19000, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "5", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": null, "ruled_on": null, "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 2, "uses_assessed": 2, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/red-rock-reservoir-ia-2/" }, { "assessment_unit_id": "IA 05-CHA-1309", "name": "Rathbun Reservoir - Main Basin", "water_type": "Reservoir", "size": { "value": 6330, "units": "Acres" }, "overall_status": "Fully Supporting", "epa_ir_category": "2", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Fully Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": "Fully Supporting", "ruled_on": [ "Aquatic Life" ], "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 0, "uses_assessed": 2, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/rathbun-reservoir-main-basin-ia/" }, { "assessment_unit_id": "IA 04-UDM-1213", "name": "Saylorville Reservoir", "water_type": "Reservoir", "size": { "value": 5950, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "5", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": "Fully Supporting", "ruled_on": [ "Aquatic Life" ], "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 2, "uses_assessed": 3, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/saylorville-reservoir-ia/" }, { "assessment_unit_id": "IA 02-IOW-630", "name": "Coralville Reservoir", "water_type": "Reservoir", "size": { "value": 4900, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "5", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": "Fully Supporting", "ruled_on": [ "Aquatic Life" ], "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 3, "uses_assessed": 3, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/coralville-reservoir-ia/" }, { "assessment_unit_id": "IA 06-LSR-1655", "name": "Big Spirit Lake", "water_type": "Lake", "size": { "value": 4169, "units": "Acres" }, "overall_status": "Fully Supporting", "epa_ir_category": "2", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Fully Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": null, "ruled_on": null, "threatened": null }, "drinking_water": { "status": "Fully Supporting", "ruled_on": [ "Drinking Water" ], "threatened": null } }, "listed_causes": 0, "uses_assessed": 2, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/big-spirit-lake-ia-2/" }, { "assessment_unit_id": "IA 02-WIN-841", "name": "Clear Lake", "water_type": "Lake", "size": { "value": 3684, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "4A", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": null, "ruled_on": null, "threatened": null }, "drinking_water": { "status": "Fully Supporting", "ruled_on": [ "Drinking Water" ], "threatened": null } }, "listed_causes": 2, "uses_assessed": 3, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/clear-lake-ia/" }, { "assessment_unit_id": "IA 04-RAC-1143", "name": "Storm Lake", "water_type": "Lake", "size": { "value": 3147, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "5", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": null, "ruled_on": null, "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 2, "uses_assessed": 2, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/storm-lake-ia/" }, { "assessment_unit_id": "IA 04-EDM-975", "name": "Tuttle Lake (a.k.a. Okamanpeedan Lake)", "water_type": "Lake", "size": { "value": 2360, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "4A", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Hypereutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": "Fully Supporting", "ruled_on": [ "Aquatic Life - Lakes and Wetlands Warmwater" ], "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 2, "uses_assessed": 2, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/tuttle-lake-a-k-a-okamanpeedan-lake-ia-2/" }, { "assessment_unit_id": "IA 06-LSR-1653", "name": "West Okoboji Lake - Main Basin South", "water_type": "Lake", "size": { "value": 1885, "units": "Acres" }, "overall_status": "Fully Supporting", "epa_ir_category": "2", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Mesotrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Fully Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": null, "ruled_on": null, "threatened": null }, "drinking_water": { "status": "Fully Supporting", "ruled_on": [ "Drinking Water" ], "threatened": null } }, "listed_causes": 0, "uses_assessed": 2, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/west-okoboji-lake-main-basin-south-ia/" }, { "assessment_unit_id": "IA 05-CHA-2028", "name": "Rathbun Reservoir - Chariton Arm", "water_type": "Reservoir", "size": { "value": 1860, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "4A", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": "Not Supporting", "ruled_on": [ "Aquatic Life" ], "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 1, "uses_assessed": 2, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/rathbun-reservoir-chariton-arm-ia/" }, { "assessment_unit_id": "IA 06-LSR-1652", "name": "East 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"units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "4A", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Hypereutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": "Not Supporting", "ruled_on": [ "Aquatic Life" ], "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 1, "uses_assessed": 2, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/rathbun-reservoir-south-fork-arm-ia/" }, { "assessment_unit_id": "IA 04-RAC-1194", "name": "Lake Panorama", "water_type": "Lake", "size": { "value": 1400, "units": "Acres" }, "overall_status": "Not Assessed", "epa_ir_category": "3", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": null, "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": null, "ruled_on": null, "threatened": null }, "aquatic_life": { "status": null, "ruled_on": null, "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 0, "uses_assessed": 0, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/lake-panorama-ia/" }, { "assessment_unit_id": "IA 06-LSR-1636", "name": "Trumbull Lake", "water_type": "Lake", "size": { "value": 1183, "units": "Acres" }, "overall_status": "Fully Supporting", "epa_ir_category": "2", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA 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true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Fully Supporting", "ruled_on": [ "Human Health", "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": "Fully Supporting", "ruled_on": [ "Aquatic Life - Lakes and Wetlands Warmwater" ], "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 0, "uses_assessed": 3, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/lost-island-lake-ia/" }, { "assessment_unit_id": "IA 06-LSR-1669", "name": "Silver Lake", "water_type": "Lake", "size": { "value": 1041, "units": "Acres" }, "overall_status": "Fully Supporting", "epa_ir_category": "1", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Fully Supporting", "ruled_on": [ "Human Health", "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": "Fully Supporting", "ruled_on": [ "Aquatic Life - Lakes and Wetlands Warmwater" ], "threatened": null }, "drinking_water": { "status": "Fully Supporting", "ruled_on": [ "Drinking Water" ], "threatened": null } }, "listed_causes": 0, "uses_assessed": 4, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/silver-lake-ia-7/" }, { "assessment_unit_id": "IA 04-UDM-1300", "name": "Five Island Lake", "water_type": "Lake", "size": { "value": 951, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "4A", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Hypereutrophic", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": "Not Supporting", "ruled_on": [ "Primary Contact Recreation" ], "threatened": null }, "aquatic_life": { "status": null, "ruled_on": null, "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 2, "uses_assessed": 1, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/five-island-lake-ia/" }, { "assessment_unit_id": "IA 02-IOW-656", "name": "Big Wall Lake", "water_type": "Lake", "size": { "value": 935, "units": "Acres" }, "overall_status": "Not Supporting", "epa_ir_category": "5", "cycle_last_assessed": "2024", "integrated_report": { "status": "EPA Interim Action", "cycle": "2024", "decided_in_open_cycle": true }, "trophic_status": "Eutrophic", 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