| WBID | Waterbody | Location | Counties | IR Category | Impairment(s) |
| IA 06-BSR-0010_3 | Big Sioux River | from confluence Brule Cr. near Richland SD (S33 T92N R49W Plymouth Co.) to confluence with Indian Cr. in S9 T93N R48W Plymouth Co. | Plymouth | 5a | Pathogens--Unionized Ammonia--Unknown toxicity |
| IA 06-BSR-0020_2 | Big Sioux River | from confluence with Beaver Cr near Canton SD (S36 T98N R49W Lyon Co.) to confluence with Ninemile Cr. in S25 T100N R49W Lyon Co. | Lyon | 5a | Pathogens |
| IA 06-BSR-0010_4 | Big Sioux River | from confluence with Indian Cr. (S9 T93N R48W Plymouth Co.) to confluence with Rock R. in S1 T95N R48W Sioux Co. | Plymouth--Sioux | 5a | Pathogens--Unionized Ammonia |
| IA 04-RAC-00475-L_0 | Black Hawk Lake | Sac County S35 T87N R36W at Lake View. | Sac | 5a | Algal Grwth/Chlorophyll a--Exotic species--Noxious aquatic plants--Suspended solids--Turbidity |
| IA 06-BSR-0023_0 | Broken Kettle Creek | from mouth (S9 T90N R48W Plymouth Co.) to confluence with an unnamed tributary in S19 T92N R47W Plymouth Co. | Plymouth | 5b | Cause Unknown--Other habitat alterations--Siltation |
| IA 04-UDM-0400_0 | Brown Creek | mouth (NW 1/4 S24 T99N R34W Emmet Co.) to IA/MN state line. | Emmet | 4d | Organic enrichment/Low DO--Unionized Ammonia |
| IA 06-WEM-00485-L_0 | Browns Lake | Woodbury County S32 T87N R47W 2 mi W of Salix. | Woodbury | 5a | Algal Grwth/Chlorophyll a--Other habitat alterations--Turbidity |
| IA 04-UDM-0100_4 | Des Moines River | from confluence Drainage Ditch No. 151 (N line S6 T98N R33W Emmet Co.) to confluence with School Cr. at Estherville in S15 T99N R34W Emmet Co. | Emmet | 4d | Organic enrichment/Low DO--Unionized Ammonia |
| IA 04-UDM-0100_3 | Des Moines River | from confluence with Jack Cr. (S35 T97N R33W Palo Alto Co.) to confluence with Drainage Ditch No. 151 at N line S6 T98N R33W Emmet Co. | Emmet--Palo Alto | 4d | Organic enrichment/Low DO--Unionized Ammonia |
| IA 06-LSR-00315-L_0 | Dog Creek Lake | O'Brien County S29 T94N R39W 3 mi SE of Sutherland. | O'Brien | 5a | Nutrients--Other--Siltation--Turbidity |
| IA 04-EDM-0020_4 | East Fork Des Moines River | from confluence with Soldier Cr. (S36 T100N R32W Emmet Co.) to outlet control structure of Tuttle Lake (aka Lake Okamanpeedan) in S14 T100N R32W Emmet Co. | Emmet | 5a | Organic enrichment/Low DO |
| IA 04-UDM-03850-L_0 | Five Island Lake | Palo Alto County S18 T96N R32W at Emmetsburg. | Palo Alto | 4a | Algal Grwth/Chlorophyll a--Nutrients--Turbidity |
| IA 06-FLO-0020_2 | Floyd River | from city of Alton (north line S11 T94N R44W Sioux Co.) to confluence with North Fork Floyd R. in S30 T97N R41W O'Brien Co. | O'Brien--Sioux | 5b | Nutrients--Organic enrichment/Low DO--Siltation--Unionized Ammonia |
| IA 06-FLO-0020_1 | Floyd River | from confluence with West Branch Floyd R. (S2 T91N R46W Plymouth Co.) to city of Alton at north line S11 T94N R44W Sioux Co. | Plymouth--Sioux | 5b | Cause Unknown |
| IA 06-FLO-0010_0 | Floyd River | mouth to West Branch Floyd R. in S2 T91N R46W Plymouth Co. | Plymouth--Woodbury | 5a | Copper--Lead--Unionized Ammonia |
| IA 06-LSR-0108_0 | Halfway Creek | mouth (S22 T89N R39W Ida Co.) to confluence with unnamed tributary in SE 1/4 S24 T89N R39W Ida Co. | Ida | 4c | Other habitat alterations |
| IA 04-UDM-03985-L_0 | Ingham Lake | Emmet County S12 T98N R33W 6 mi E of Wallingford. | Emmet | 4a | Algal Grwth/Chlorophyll a--Noxious aquatic plants--Nutrients--pH--Turbidity |
| IA 06-LSR-0143_0 | Johns Creek | mouth (S24 T90N R44W Plymouth Co.) to confluence with Rathburn Cr. in S26 T91N R44W Plymouth Co. | Plymouth | 5b | Cause Unknown |
| IA 04-RAC-01620-L_0 | Little Clear Lake | Pocahontas County S6 T91N R34W 11 mi W of Pocahontas. | Pocahontas | 4c | Exotic species--Nutrients--Siltation |
| IA 06-FLO-0085_0 | Little Floyd River | From confluence with Lamkin Cr to headwaters. | O'Brien | 4d | Organic enrichment/Low DO--Unionized Ammonia |
| IA 06-FLO-0080_0 | Little Floyd River | mouth (S1 T96N R43W Sioux Co.) to confluence with Lamkin Cr. in S8 T96N R42W O'Brien Co. | O'Brien--Sioux | 4a | Organic enrichment/Low DO--Siltation |
| IA 06-LSR-0040_3 | Little Sioux River | from confluence with West Fork Little Sioux R. (S36 T100N R38W Dickinson Co.) to the Iowa/Minnesota state line | Dickinson | 5b | Cause Unknown |
| IA 06-LSR-0030_1 | Little Sioux River | from Highway 3 (S26 T92N R40W Cherokee Co.) to confluence with Waterman Cr. in S26 T94N R39W O'Brien Co. | Cherokee--O'Brien | 5a | Pathogens |
| IA 06-LSR-02870-L_0 | Little Spirit Lake | Dickinson County S8 T100N R36W 5 mi. NE of Montgomery. | Dickinson | 4a | Algal Grwth/Chlorophyll a--Nutrients--pH--Suspended solids--Turbidity |
| IA 04-UDM-0315_2 | Lizard Creek | from west line S5 T91N R32W at east edge of Pocahontas (Pocahontas Co.) to headwaters in S20 T93N R33W Pocahontas Co. | Pocahontas--Webster | 4d | Unionized Ammonia |
| IA 06-LSR-02390-L_0 | Lost Island Lake | Palo Alto County S31 T97N R34W 3 mi N of Ruthven. | Clay--Palo Alto | 5a | Algal Grwth/Chlorophyll a--Noxious aquatic plants--Nutrients--Turbidity |
| IA 06-LSR-02805-L_0 | Lower Gar Lake | Dickinson County S32 T99N R36W 2 mi. NE of Milford. | Dickinson | 4a | Algal Grwth/Chlorophyll a--Noxious aquatic plants--Turbidity |
| IA 06-LSR-0305_0 | Milford Creek | from confluence with unnamed tributary (S18 T98N R36W Dickinson Co.) to outlet structure of Lower Gar Lake in NW 1/4 S5 T98N R36W Dickinson Co. | Dickinson | 5a | Organic enrichment/Low DO--Other habitat alterations--Unknown toxicity |
| IA 06-LSR-0300_0 | Milford Creek | mouth (S14 T98N R37W Dickinson Co.) to confluence with unnamed tributary in S18 T98N R36W Dickinson Co. | Dickinson | 5b | Organic enrichment/Low DO--Other habitat alterations--Unionized Ammonia--Unknown toxicity |
| IA 06-LSR-0170_0 | Mill Creek | mouth (S14 T92N R40W Cherokee Co.) to confluence with Whisky Cr. at east line S29 T94N R41W O'Brien Co. | Cherokee--O'Brien | 5b | Organic enrichment/Low DO--Other habitat alterations--Siltation |
| IA 06-WEM-0040_2 | Missouri River | from confluence with Elm Cr. (S18 T83N R46W Monona Co. at river mile 691.0 at Decatur NE.) to confluence with Omaha Creek Ditch east of Homer NE at river mile 715.8 (=SW 1/4 S6 T86N R47W Woodbury Co. (near Browns Lake)). | Monona--Woodbury | 5a | Flow alteration--Other habitat alterations--Pathogens |
| IA 06-WEM-0040_3 | Missouri River | from confluence with Omaha Creek Ditch (SW 1/4 S6 T86N R47W Woodbury Co. at river mile 715.8 (near Browns Lake)) to confluence with Big Sioux R. at river mile 734.0 at Sioux City Woodbury Co. | Woodbury | 5a | Flow alteration--Other habitat alterations--Pathogens |
| IA 06-BSR-0095_0 | Moon Creek | mouth to headwaters | Lyon | 4d | Organic enrichment/Low DO--Unionized Ammonia |
| IA 06-BSR-0080_0 | Mud Creek | mouth (S26 T98N R46W Lyon Co.) to the IA-MN state line | Lyon | 5b | Cause Unknown |
| IA 04-RAC-0040_5 | North Raccoon River | from confluence with Camp Cr. (S7 T86N R34W Calhoun Co.) to confluence with Indian Cr. in S24 T87N R36W Sac Co. | Calhoun--Sac | 5a | Cause Unknown--Pathogens |
| IA 04-RAC-0040_6 | North Raccoon River | from confluence with Indian Cr. (S24 T87N R36W Sac Co.) to confluence with Cedar Cr. in S25 T88N R36W Sac Co. | Sac | 5a | Cause Unknown--Pathogens |
| IA 04-RAC-0050_2 | North Raccoon River | from County Road M54 (S24 T88N R36W Sac Co.) to confluence with Drainage Ditch 101 in S36 T91N R36W Buena Vista Co. | Buena Vista--Sac | 5b | Cause Unknown |
| IA 06-BSR-0072_0 | Otter Creek | from confluence with unnamed tributary (S14 T99N R42 W Osceola Co.) to the Iowa/Minnesota state line | Osceola | 5b | Organic enrichment/Low DO--Unionized Ammonia |
| IA 06-BSR-0070_3 | Otter Creek | from the Lyon-Osceola county line (E line S36 T98N R43W Lyon Co.) to confluence with unnamed tributary in S14 T99N R42W Osceola Co. | Osceola | 5b | Organic enrichment/Low DO--Other |
| IA 06-BSR-0021_0 | Perry Creek | from mouth (S32 T89N R47W Woodbury Co.) to confluence with unnamed tributary in S35 T91N R47W Plymouth Co. | Plymouth--Woodbury | 5b | Cause Unknown |
| IA 04-RAC-01695_0 | Poor Farm Creek | mouth (T91N R36W Sec 15 Buena Vista Co.) to headwaters in S34 T91N R37W Buena Vista Co. | Buena Vista | 5b | Chlorine--Unknown toxicity |
| IA 06-BSR-0030_0 | Rock River | mouth (S1 T95N R48W Sioux Co.) to confluence with Little Rock R. in S35 T98N R46W Lyon Co. | Lyon--Sioux | 5b | Organic enrichment/Low DO--Unionized Ammonia |
| IA 06-LSR-03105-L_0 | Silver Lake | Dickinson County S28 T100N R38W near Lake Park. | Dickinson | 5a | Algal Grwth/Chlorophyll a--Nutrients--Turbidity |
| IA 04-UDM-01020-L_0 | Silver Lake | Palo Alto County S20 T95N R34W 2 mi W of Ayrshire. | Palo Alto | 4a | Algal Grwth/Chlorophyll a--Noxious aquatic plants--Nutrients--Organic enrichment/Low DO--Other--Suspended solids--Turbidity |
| IA 06-BSR-0029_0 | Sixmile Creek | mouth (S28 T94N R48W Sioux Co.) to confluence with unnamed tributary in S19 T95N R46W Sioux Co. | Sioux | 5a | Other habitat alterations--Unionized Ammonia |
| IA 04-RAC-00530-L_0 | Storm Lake | Buena Vista County S14 T90N R37W at Storm Lake. | Buena Vista | 4a | Algal Grwth/Chlorophyll a--Nutrients--Suspended solids--Turbidity |
| IA 06-LSR-02450-L_0 | Trumbull Lake | Clay County S27 T97N R35W 5 mi NE of Dickens. | Clay | 4a | Algal Grwth/Chlorophyll a--Noxious aquatic plants--Nutrients--Suspended solids--Turbidity |
| IA 04-EDM-00290-L_0 | Tuttle Lake (a.k.a. Okamanpeedan Lake) | Emmett County S14 T100N R32W 2 mi. N of Dolliver. | Emmet | 4a | Algal Grwth/Chlorophyll a--Noxious aquatic plants--Nutrients--Organic enrichment/Low DO--Suspended solids--Turbidity |
| IA 06-BSR-0065_0 | Unnamed Tributary to Little Rock River | mouth (T98N R44W Sec7 NE) to headwaters (T99N R44W Sec23 SE) Lyon Co | Lyon | 5b | Unionized Ammonia |
| IA 06-BSR-0074_0 | Unnamed tributary to Otter Creek | from mouth (SW 1/4 S1 T98N R42W Osceola Co.) to headwaters in NW 1/4 S21 T98N R42W Osceola Co. | Osceola | 4d | Organic enrichment/Low DO--Unionized Ammonia |
| IA 06-LSR-01485_0 | Unnamed Tributary to Pierson Creek | mouth to headwaters | Plymouth--Woodbury | 4d | Unionized Ammonia |
| IA 06-LSR-01487_0 | Unnamed Tributary to Unnamed Tributary to Pierson Creek | mouth to headwaters | Plymouth--Woodbury | 4d | Unionized Ammonia |
| IA 06-LSR-02830-L_0 | Upper Gar Lake | Dickinson County S29 T99N R36W at E edge of Arnolds Park. | Dickinson | 4a | Algal Grwth/Chlorophyll a--Noxious aquatic plants--Nutrients--Suspended solids--Turbidity |
| IA 06-FLO-0040_0 | West Branch Floyd River | from confluence with Orange City Slough (S28 T94N R45W Sioux Co.) to confluence with unnamed tributary in NE 1/4 S18 T96N R44W Sioux Co. | Sioux | 5b | Cause Unknown--Other habitat alterations--Siltation |
| IA 06-LSR-0131_0 | West Fork Little Sioux River | confluence with unnamed tributary in S3 T91N R42W Cherokee Co. to headwaters | Cherokee | 5b | Cause Unknown |
| IA 06-LSR-02840-L_2 | West Okoboji Lake | southwestern bay of West Okoboji Lake in Sections 25 26 35 36 T99N R37W Dickinson Co. | Dickinson | 5a | Pathogens |
| IA 06-FLO-0065_0 | Willow Creek | from tributary in NE 1/4 S11 T93N R44W Plymouth Co. to headwaters. | O'Brien--Plymouth--Sioux | 5b | Organic enrichment/Low DO--Unionized Ammonia |
| IA 06-LSR-0223_0 | Willow Creek | mouth (S17 T94N R36W Clay Co.) to confluence with unnamed tributary in NW 1/4 S31 T95N R37W Clay Co. | Clay | 5b | Organic enrichment/Low DO--Unionized Ammonia |
