| Allen Creek | 33.4 | 33 |
| Ames Creek | 15.2 | 15 |
| Asher Creek | 18.9 | 19 |
| Ashton Creek | 15.5 | 16 |
| Badger Creek | 23.3 | 23 |
| Bailey Creek | 28.5 | 29 |
| Baskins Run | 20 | 20 |
| Battle Creek | 16.6 | 17 |
| Bear Creek (Cedar River tributary) | 25.7 | 26 |
| Bear Creek (Cedar River tributary) | 15.1 | 31 |
| Bear Creek (Des Moines River tributary) | 16.2 | 16 |
| Bear Creek (Maquoketa River - North Fork tributary) | 18.2 | 18 |
| Bear Creek (Maquoketa River tributary) | 43.6 | 44 |
| Bear Creek (South Skunk River tributary) | 22 | 22 |
| Bear Creek (Volga River tributary) | 15.1 | 15 |
| Beaver Creek (Cedar River tributary) | 62.2 | 159 |
| Beaver Creek (Des Moines River tributary) | 33.3 | 33 |
| Beaver Creek (Des Moines River tributary) | 77.1 | 92 |
| Beaver Creek (Iowa River - South Fork tributary) | 23.7 | 24 |
| Beaver Creek (Shell Rock River tributary) | 16.7 | 17 |
| Beaver Creek (Shell Rock River tributary) | 20.4 | 20 |
| Beaver Creek (Shell Rock River tributary) | 23.3 | 23 |
| Beaver Creek (South Raccoon River tributary) | 18.7 | 19 |
| Beaver Creek (Winnebago River tributary) | 18.7 | 19 |
| Beaverdam Creek | 27.9 | 41 |
| Beaverdam Creek - East Branch | 18.8 | 19 |
| Beaverdam Creek - West Branch | 13.3 | 13 |
| Big Bear Creek | 45.5 | 67 |
| Big Creek (Cedar River tributary) | 23.9 | 24 |
| Big Creek (Des Moines River tributary) | 35.5 | 36 |
| Big Creek - East Fork (Grand River tributary) | 5.5 | 6 |
| Big Creek (Skunk River tributary) | 49.4 | 49 |
| Big Indian Creek | 34.1 | 34 |
| Big Muddy Creek | 36 | 36 |
| Big Sioux River | 135.7 | 506 |
| Big Slough Creek | 16.3 | 16 |
| Black Cat Creek | 39.9 | 40 |
| Black Hawk Creek | 58.2 | 104 |
| Black Hawk Creek - North Fork | 23.9 | 46 |
| Black Hawk Creek - South Fork | 21.6 | 22 |
| Blood Run | 13.1 | 13 |
| Bloody Run (Des Moines River - East Fork tributary) | 16.4 | 16 |
| Bloody Run (Mississippi River tributary) | 17.9 | 18 |
| Blue Earth River - Middle Branch | 26.8 | 27 |
| Blue Earth River - West Branch | 14.1 | 14 |
| Bluff Creek | 20.4 | 20 |
| Bohemian Creek | 17.8 | 18 |
| Boone River | 111.3 | 299 |
| Boone River - East Branch | 15.8 | 32 |
| Boone River - Middle Branch | 15.8 | 16 |
| Boyer River | 108.5 | 263 |
| Boylan Creek | 28.7 | 29 |
| Bridge Creek | 16 | 16 |
| Broken Kettle Creek | 24.9 | 25 |
| Brooke Creek | 24.8 | 25 |
| Brophy Creek | 16.1 | 16 |
| Brush Creek (Maquoketa River tributary) | 18.1 | 18 |
| Brush Creek (Skunk River tributary) | 22.6 | 23 |
| Brush Creek (Volga River tributary) | 15.2 | 15 |
| Brushy Creek (Des Moines River tributary) | 25.4 | 25 |
| Brushy Creek (Platte River tributary) | 3.5 | 4 |
| Brushy Creek (South Raccoon River tributary) | 50.7 | 51 |
| Buck Creek (East Nishnabotna River tributary) | 16.4 | 16 |
| Buck Creek (Little Wapsipinicon River tributary) | 42 | 42 |
| Buck Creek (Maquoketa River tributary) | 18.1 | 18 |
| Buck Creek (Mississippi River tributary) | 22 | 22 |
| Buck Creek (White Fox Creek tributary) | 15.6 | 16 |
| Buffalo Creek (Des Moines River - East Fork tributary) | 39.8 | 68 |
| Buffalo Creek - East Branch (Wapsipinicon River tributary) | 19.9 | 20 |
| Buffalo Creek (Otter Creek (Hartgrave Creek tributary)) | 20.7 | 21 |
| Buffalo Creek (Wapsipinicon River tributary) | 58.8 | 96 |
| Buffalo Creek - West Branch (Wapsipinicon River tributary) | 17.6 | 18 |
| Buffington Creek | 8.9 | 25 |
| Burr Oak Creek (Little Cedar River tributary) | 14.9 | 15 |
| Burr Oak Creek (Rock River tributary) | 16.3 | 16 |
| Burr Oak Creek (Walnut Creek (Skunk River tributary)) | 15.3 | 15 |
| Buttrick Creek | 10.3 | 80 |
| Caleb Creek | 17 | 17 |
| Calhoun Creek | 17.1 | 32 |
| Camp Creek (Des Moines River tributary) | 20.3 | 20 |
| Camp Creek (North Raccoon River tributary) | 27.1 | 49 |
| Camp Creek - West Fork (North Raccoon River tributary) | 21.7 | 22 |
| Canoe Creek | 33.2 | 33 |
| Carter Creek | 24.7 | 25 |
| Catfish Creek | 3.4 | 30 |
| Catfish Creek - Middle Fork | 14.3 | 14 |
| Catfish Creek - South Fork | 12 | 12 |
| Cedar Creek (Des Moines River tributary) | 63.6 | 136 |
| Cedar Creek (North Raccoon River tributary) | 47.7 | 88 |
| Cedar Creek (North Raccoon River tributary) | 25.2 | 72 |
| Cedar Creek (North River tributary) | 23.7 | 24 |
| Cedar Creek (North Skunk River tributary) | 26.5 | 44 |
| Cedar Creek (Skunk River tributary) | 85 | 149 |
| Cedar River | 284.3 | 2,135 |
| Cedar River - West Fork | 68 | 761 |
| Chariton Creek | 19 | 19 |
| Chariton River | 106.3 | 342 |
| Chariton River - South Fork | 42.7 | 74 |
| Chequest Creek | 48.6 | 63 |
| Cherry Creek | 15.8 | 16 |
| Clanton Creek | 23.8 | 79 |
| Clanton Creek - North Fork | 21.1 | 21 |
| Clanton Creek - South Fork | 15.9 | 16 |
| Clear Creek (Indian Creek (South Skunk River tributary)) | 29.1 | 29 |
| Clear Creek (Iowa River tributary) | 31.2 | 31 |
| Clear Creek (Nodaway River tributary) | 2.9 | 3 |
| Clear Creek (Skunk River tributary) | 15.4 | 15 |
| Coal Creek (Des Moines River tributary) | 16.9 | 17 |
| Coal Creek (South River tributary) | 28.6 | 29 |
| Coffins Creek | 13.6 | 30 |
| Coldwater Creek | 40.8 | 41 |
| Competine Creek | 18.7 | 19 |
| Cooper Creek | 31.1 | 31 |
| Crane Creek | 39.3 | 39 |
| Crooked Creek (Cedar River tributary) | 16.2 | 16 |
| Crooked Creek - East Fork (Skunk River tributary) | 33 | 33 |
| Crooked Creek (Grand River tributary) | 15 | 15 |
| Crooked Creek (Skunk River tributary) | 13.3 | 92 |
| Crooked Creek (Troublesome Creek tributary) | 16.4 | 16 |
| Crooked Creek - West Fork (Skunk River tributary) | 46 | 46 |
| Cylinder Creek | 30 | 30 |
| Davids Creek | 17.3 | 17 |
| Davis Creek | 18.4 | 18 |
| Deep Creek (Maquoketa River tributary) | 30.9 | 46 |
| Deep Creek (Willow Creek (Floyd River tributary)) | 31.5 | 32 |
| Deep River | 21.2 | 21 |
| Deer Creek (Cedar River tributary) | 18.6 | 19 |
| Deer Creek (Des Moines River tributary) | 19.1 | 19 |
| Deer Creek (Iowa River tributary) | 26.3 | 26 |
| Des Moines River | 418.1 | 4,218 |
| Des Moines River - East Fork | 131.5 | 380 |
| Devils Creek | 14.1 | 41 |
| Dowd Creek | 15.6 | 16 |
| Dry Run Creek | 17.2 | 17 |
| Dry Run (Horton Creek tributary) | 18.5 | 19 |
| Dry Run (Mill Creek (Little Sioux River tributary)) | 16.8 | 17 |
| Dry Run (Ocheyedan River tributary) | 15.1 | 15 |
| Duck Creek | 21.4 | 21 |
| Dutch Creek | 15.7 | 16 |
| Eagle Creek | 38.2 | 38 |
| East Boyer River | 22.9 | 23 |
| East Buttrick Creek | 30 | 30 |
| East Cedar Creek | 27.3 | 27 |
| East Indian Creek | 37.3 | 37 |
| East Nishnabotna River | 123.6 | 311 |
| East Nodaway River | 72.8 | 107 |
| East Nodaway River - East Fork | 12.3 | 12 |
| East Otter Creek | 16.7 | 17 |
| East Platte River | 16.1 | 16 |
| East Soldier River | 20.5 | 34 |
| East Tarkio Creek | 22.8 | 23 |
| Elk Creek (Shell Rock River tributary) | 21.5 | 22 |
| Elk Creek (South Skunk River tributary) | 24.6 | 25 |
| Elk Creek (Thompson River tributary) | 18.4 | 18 |
| Elk Creek (Turkey River tributary) | 18 | 18 |
| Elkhorn Creek | 16.1 | 16 |
| Elk River | 21.7 | 22 |
| Elk Run | 15.2 | 15 |
| English Creek | 46.5 | 47 |
| English River | 37.5 | 210 |
| Farm Creek (Maquoketa River tributary) | 16.7 | 17 |
| Farm Creek (West Nishnabotna River tributary) | 17.6 | 59 |
| Farmers Creek | 23.8 | 24 |
| Flint Creek | 35.4 | 35 |
| Flood Creek | 51.9 | 52 |
| Floyd River | 111.8 | 279 |
| Floyd River - West Branch | 55.1 | 89 |
| Fourmile Creek (Des Moines River - East Fork tributary) | 18.8 | 19 |
| Fourmile Creek (Des Moines River tributary) | 34.6 | 35 |
| Fourmile Creek (Thompson River tributary) | 15.9 | 16 |
| Fox River | 52 | 70 |
| German Creek | 17.4 | 17 |
| Goose Creek (Iowa River tributary) | 17.6 | 18 |
| Goose Creek (Shell Rock River tributary) | 6.1 | 6 |
| Grand River | 42.3 | 553 |
| Grand River - East Fork | 38.5 | 65 |
| Grand River - Middle Fork | 14.9 | 15 |
| Graybill Creek | 24.4 | 24 |
| Gray Creek | 16.8 | 17 |
| Grays Creek | 19 | 19 |
| Greenbrier Creek | 28.8 | 29 |
| Hardin Creek | 54.8 | 55 |
| Hartgrave Creek | 11.9 | 107 |
| Honey Creek (Iowa River tributary) | 34.6 | 35 |
| Honey Creek (Maquoketa River tributary) | 16 | 31 |
| Honey Creek (Missouri River tributary) | 15.9 | 16 |
| Honey Creek (Platte River tributary) | 28.5 | 29 |
| Horton Creek | 14.2 | 33 |
| Hunter Branch | 15.1 | 15 |
| Hunter Creek | 18.1 | 18 |
| Indian Creek (Big Sioux River tributary) | 23.2 | 23 |
| Indian Creek (Cedar River tributary) | 27.3 | 27 |
| Indian Creek (Des Moines River tributary) | 17.8 | 18 |
| Indian Creek (East Nishnabotna River tributary) | 38.2 | 54 |
| Indian Creek (North Raccoon River tributary) | 23.2 | 23 |
| Indian Creek (South Skunk River tributary) | 24 | 111 |
| Indian Creek (West Nishnabotna River tributary) | 32.6 | 33 |
| Iowa River | 323.8 | 3,609 |
| Iowa River - East Branch | 40.1 | 40 |
| Iowa River - South Fork | 62.3 | 115 |
| Iowa River - West Branch | 40.9 | 41 |
| Jack Creek | 28 | 28 |
| Jackson Creek | 16.8 | 31 |
| Johns Creek | 20.6 | 21 |
| Johnson Creek | 19 | 19 |
| Jonathan Creek | 16 | 16 |
| Jones Creek | 17.8 | 18 |
| Jordan Creek (Farm Creek (West Nishnabotna River tributary)) | 17.2 | 17 |
| Jordan Creek (Soldier River tributary) | 16.7 | 17 |
| Kanaranzi Creek | 8 | 8 |
| Keg Creek | 64.1 | 64 |
| Keigley Branch | 21.2 | 21 |
| Kemp Creek | 21.9 | 22 |
| Lake Creek | 47.9 | 48 |
| Lick Creek | 23.9 | 24 |
| Lime Creek (Cedar River tributary) | 21.1 | 21 |
| Lime Creek (English River tributary) | 7.1 | 28 |
| Lime Creek (Winnebago River tributary) | 15.7 | 16 |
| Lindsey Creek (Des Moines River - East Fork tributary) | 25.4 | 25 |
| Lindsey Creek (Honey Creek (Maquoketa River tributary)) | 15 | 15 |
| Linn Creek | 30.3 | 30 |
| Little Bear Creek | 21.6 | 22 |
| Little Buffalo Creek | 28 | 28 |
| Little Cedar Creek (Cedar Creek (North Raccoon River tributary)) | 24.6 | 25 |
| Little Cedar Creek (Cedar Creek (Skunk River tributary)) | 29.3 | 29 |
| Little Cedar River | 67.8 | 83 |
| Little Floyd River | 10.6 | 11 |
| Little Fox River | 18 | 18 |
| Little Maple River | 15.5 | 16 |
| Little Maquoketa River | 30.3 | 70 |
| Little Maquoketa River - Middle Fork | 18.6 | 19 |
| Little Maquoketa River - North Fork | 20.6 | 39 |
| Little Medicine Creek | 1.3 | 1 |
| Little Ocheyedan River | 29.5 | 30 |
| Little Rock River | 50.6 | 124 |
| Little Silver Creek | 20.7 | 45 |
| Little Sioux River | 241 | 954 |
| Little Sioux River - West Branch | 12 | 12 |
| Little Sioux River - West Fork | 14 | 26 |
| Little Soap Creek | 25.1 | 25 |
| Little Turkey River (Turkey River tributary) | 45 | 45 |
| Little Turkey River (Turkey River tributary) | 14.3 | 14 |
| Little Volga River | 16.1 | 16 |
| Little Walnut Creek | 19.4 | 19 |
| Little Wapsipinicon River (Wapsipinicon River tributary) | 50.6 | 93 |
| Little Wapsipinicon River (Wapsipinicon River tributary) | 42 | 42 |
| Little White Breast Creek | 17.7 | 18 |
| Little Wolf Creek | 13.9 | 14 |
| Lizard Creek | 63.2 | 168 |
| Lizard Creek - North Branch | 50.6 | 51 |
| Lizard Creek - South Branch | 54.1 | 54 |
| Locust Creek | 11.2 | 11 |
| Long Creek (Iowa River tributary) | 28.3 | 96 |
| Long Creek - North Fork (Iowa River tributary) | 21.5 | 22 |
| Long Creek - South Fork (Iowa River tributary) | 21.1 | 21 |
| Long Creek (Thompson River tributary) | 16 | 16 |
| Long Dick Creek | 24.9 | 25 |
| Lost Creek (Mississippi River tributary) | 20.6 | 21 |
| Lost Creek (Wapsipinicon River tributary) | 17.7 | 18 |
| Lost Island Outlet | 10.2 | 31 |
| Lotts Creek (Des Moines River - East Fork tributary) | 41.8 | 58 |
| Lotts Creek (Grand River - East Fork tributary) | 26.9 | 27 |
| Lytle Creek | 32.7 | 33 |
| Maple Creek | 19.6 | 20 |
| Maple River | 100.1 | 171 |
| Maquoketa River | 150 | 699 |
| Maquoketa River - North Fork | 96.4 | 223 |
| Maquoketa River - South Fork | 24 | 24 |
| Maynes Creek | 42.9 | 43 |
| McClure Creek | 15.3 | 15 |
| Medicine Creek | 2.1 | 13 |
| Medicine Creek - West Fork | 9.9 | 10 |
| Middle Avery Creek | 24.3 | 24 |
| Middle Beaver Creek | 15.1 | 15 |
| Middle Creek | 27.7 | 28 |
| Middle English River | 23.2 | 23 |
| Middle Minerva Creek | 16.7 | 17 |
| Middle Nodaway River | 60.5 | 90 |
| Middle Nodaway River - West Fork | 29.7 | 30 |
| Middle Platte River | 21.6 | 49 |
| Middle Platte River - East Branch | 11.7 | 12 |
| Middle Raccoon River | 92.2 | 179 |
| Middle River | 127.1 | 206 |
| Middle Silver Creek | 23.9 | 24 |
| Middle Soldier River | 13.3 | 13 |
| Middle Tarkio Creek | 7.8 | 8 |
| Mill Creek (Boyer River tributary) | 17.1 | 17 |
| Mill Creek (East Nishnabotna River tributary) | 17.1 | 17 |
| Mill Creek (Little Sioux River tributary) | 65 | 131 |
| Mill Creek (Mississippi River tributary) | 17.2 | 17 |
| Miller Creek (Cedar River tributary) | 17.3 | 17 |
| Miller Creek (Des Moines River tributary) | 19.2 | 19 |
| Mineral Creek | 31.1 | 31 |
| Minerva Creek | 34.7 | 69 |
| Mink Creek | 17.5 | 18 |
| Minnesota Slough | 2.4 | 2 |
| Mississippi River | 321.7 | 17,313 |
| Missouri River | 179.1 | 5,048 |
| Moon Creek | 16.8 | 17 |
| Mosquito Creek (Middle Raccoon River tributary) | 42.4 | 42 |
| Mosquito Creek (Missouri River tributary) | 56.4 | 56 |
| Muchakinock Creek | 31.2 | 31 |
| Mud Creek (Cedar River tributary) | 18.4 | 18 |
| Mud Creek (Des Moines River - East Fork tributary) | 22.2 | 22 |
| Mud Creek (Des Moines River tributary) | 23.7 | 24 |
| Mud Creek (Rock River tributary) | 25.3 | 25 |
| Mud Creek (Sugar Creek (Cedar River tributary)) | 23.6 | 24 |
| Mud Creek (Wapsipinicon River tributary) | 21.1 | 21 |
| Mud Creek (West Nishnabotna River tributary) | 18.5 | 19 |
| Nelson Creek | 15.4 | 15 |
| Ninemile Creek | 15.4 | 15 |
| Nishnabotna River | 5.4 | 817 |
| Nodaway River | 4.4 | 352 |
| North Beaver Creek | 23.5 | 24 |
| North Blackbird Creek | 2.6 | 3 |
| North Cedar Creek | 37 | 37 |
| North English River | 51.9 | 96 |
| North Fabius River | 15.8 | 48 |
| North Fabius River - North Fork | 7.8 | 33 |
| North Raccoon River | 195.5 | 705 |
| North River | 106.3 | 185 |
| North River - North Branch | 32.1 | 32 |
| North Skunk River | 128.9 | 311 |
| North Timber Creek | 26.4 | 26 |
| North Walnut Creek (Walnut Creek (Iowa River tributary)) | 14.8 | 15 |
| North Walnut Creek (Walnut Creek (Skunk River tributary)) | 10.8 | 11 |
| North Wyaconda River | 20.2 | 20 |
| Norvey Creek | 4.3 | 4 |
| Ocheyedan River | 47.2 | 119 |
| Odebolt Creek | 19.5 | 20 |
| Old Mans Creek | 53 | 67 |
| Old Mans Creek - North Branch | 13.8 | 14 |
| One Hundred and Two River - East Fork | 31.4 | 31 |
| One Hundred and Two River - Middle Branch | 19.5 | 20 |
| One Hundred and Two River - Middle Fork | 27.7 | 59 |
| One Hundred and Two River - West Branch | 29.9 | 49 |
| One Hundred and Two River - West Fork | 38.9 | 88 |
| Orange City Slough | 16.4 | 16 |
| Otter Creek (Boone River tributary) | 19 | 34 |
| Otter Creek (Boyer River tributary) | 16.2 | 16 |
| Otter Creek (Cedar River tributary) | 6.4 | 39 |
| Otter Creek (Cedar River tributary) | 6.1 | 6 |
| Otter Creek (Hartgrave Creek tributary) | 31.9 | 78 |
| Otter Creek (Iowa River tributary) | 20.4 | 20 |
| Otter Creek (Little Rock River tributary) | 58.7 | 74 |
| Otter Creek (South River tributary) | 30.3 | 55 |
| Otter Creek (Turkey River tributary) | 20.2 | 20 |
| Otter Creek (Wapsipinicon River tributary) | 26.5 | 45 |
| Outlet Creek | 17.2 | 17 |
| Paint Creek | 33.2 | 33 |
| Perry Creek | 28.9 | 29 |
| Picayune Creek | 18.2 | 18 |
| Pickerel Run | 21 | 21 |
| Pierson Creek | 17.4 | 17 |
| Pigeon Creek | 43.4 | 43 |
| Pilot Creek | 35 | 35 |
| Pine Creek (Mississippi River tributary) | 15 | 15 |
| Pine Creek (Upper Iowa River tributary) | 16.1 | 16 |
| Pine Creek (Wapsipinicon River tributary) | 15.3 | 15 |
| Platte Branch | 19.1 | 19 |
| Platte River | 55.8 | 319 |
| Plum Creek (Maquoketa River tributary) | 31.8 | 32 |
| Plum Creek (Missouri River tributary) | 15.8 | 16 |
| Prairie Creek (Boone River tributary) | 35.7 | 36 |
| Prairie Creek (Calhoun Creek tributary) | 15.1 | 15 |
| Prairie Creek (Cedar Creek (North Raccoon River tributary)) | 15.7 | 16 |
| Prairie Creek (Cedar River tributary) | 48.1 | 48 |
| Prairie Creek (Cedar River tributary) | 15.9 | 16 |
| Prairie Creek (Coffins Creek tributary) | 16 | 16 |
| Prairie Creek (Des Moines River tributary) | 15.9 | 16 |
| Prairie Creek (Des Moines River tributary) | 23.3 | 23 |
| Prairie Creek (Little Sioux River tributary) | 16.6 | 17 |
| Prairie Creek (Maquoketa River tributary) | 17.2 | 17 |
| Pratt Creek | 18.3 | 18 |
| Purgatory Creek | 33.8 | 34 |
| Quarter Section Run | 29.8 | 50 |
| Raccoon River | 30.8 | 1,080 |
| Rapid Creek | 16 | 16 |
| Rat Creek | 15.1 | 15 |
| Richland Creek (Iowa River tributary) | 21.1 | 21 |
| Richland Creek (Skunk River tributary) | 19.5 | 20 |
| Roberts Creek | 40.8 | 41 |
| Rock Creek (Cedar Creek (North Skunk River tributary)) | 17.5 | 18 |
| Rock Creek (Cedar River tributary) | 20.3 | 20 |
| Rock Creek (Cedar River tributary) | 35.4 | 35 |
| Rock Creek (Cedar River tributary) | 24.1 | 24 |
| Rock Creek (Little Sioux River tributary) | 20.9 | 21 |
| Rock Creek (Missouri River tributary) | 6.7 | 7 |
| Rock Creek (North Skunk River tributary) | 19.9 | 20 |
| Rock Creek (Wapsipinicon River tributary) | 20.5 | 21 |
| Rock River | 52.1 | 271 |
| Rock Run Creek | 21.3 | 21 |
| Salt Creek | 41.6 | 73 |
| Salt Creek - East Branch | 15.8 | 16 |
| Salt Creek - South Branch | 15.9 | 16 |
| Sand Creek | 19.2 | 19 |
| Sevenmile Creek | 39.2 | 39 |
| Shain Creek | 6 | 6 |
| Shell Rock River | 100.8 | 410 |
| Shoal Creek (Chariton River tributary) | 31.4 | 31 |
| Short Creek | 15.6 | 16 |
| Silver Creek (Des Moines River tributary) | 16.7 | 17 |
| Silver Creek (Maquoketa River tributary) | 18.4 | 18 |
| Silver Creek (Upper Iowa River tributary) | 15.4 | 15 |
| Silver Creek (Wapsipinicon River tributary) | 18.2 | 18 |
| Silver Creek (West Nishnabotna River tributary) | 65.2 | 110 |
| Sixmile Creek | 37.4 | 37 |
| Skunk River | 93.3 | 1,269 |
| Smith Creek | 20.4 | 20 |
| Snipe Creek | 15.7 | 16 |
| Soap Creek | 51.3 | 94 |
| Soldier Creek | 19 | 19 |
| Soldier River | 61.7 | 112 |
| Soldier River Cutoff | 5.2 | 117 |
| South Avery Creek | 26.2 | 26 |
| South Beaver Creek | 35.8 | 54 |
| South Beaver Creek - Middle Fork | 18.4 | 18 |
| South Chequest Creek | 14 | 14 |
| South Creek | 6.1 | 6 |
| South English River | 48.5 | 49 |
| South Minerva Creek | 17.3 | 34 |
| South Otter Creek | 24.6 | 25 |
| South Raccoon River | 72.1 | 321 |
| South River | 62.2 | 204 |
| South Skunk River | 185.3 | 447 |
| South Soap Creek | 17.3 | 17 |
| South Squaw Creek | 15.4 | 15 |
| South Timber Creek | 13.3 | 13 |
| South Walnut Creek | 13.9 | 14 |
| South White Breast Creek | 16.4 | 16 |
| South Wyaconda River | 20.9 | 21 |
| Spring Creek (Cedar River tributary) | 19.1 | 19 |
| Spring Creek (Otter Creek (Hartgrave Creek tributary)) | 24.9 | 25 |
| Squaw Creek (Hartgrave Creek tributary) | 17.8 | 18 |
| Squaw Creek (South River tributary) | 42.5 | 58 |
| Squaw Creek (South Skunk River tributary) | 41.5 | 42 |
| Steel Creek | 21.5 | 22 |
| Stony Creek | 26.9 | 27 |
| Storm Creek | 17.9 | 18 |
| Sugar Creek (Cedar River tributary) | 37.7 | 61 |
| Sugar Creek (Deep Creek (Maquoketa River tributary)) | 15.2 | 15 |
| Sugar Creek (Des Moines River tributary) | 45.2 | 45 |
| Sugar Creek (Devils Creek tributary) | 27 | 27 |
| Sugar Creek (Iowa River tributary) | 15.1 | 15 |
| Sugar Creek (North Skunk River tributary) | 24.9 | 25 |
| Tarkio River | 47.3 | 118 |
| Tete des Morts Creek | 17.6 | 18 |
| Thompson River | 114.6 | 359 |
| Threemile Creek | 33.7 | 34 |
| Timber Creek | 10.1 | 50 |
| Tipton Creek | 28.8 | 29 |
| Tom Creek | 27.9 | 28 |
| Troublesome Creek | 34.1 | 51 |
| Trout River | 13.6 | 14 |
| Trulner Creek | 16.1 | 16 |
| Turkey Creek | 31.9 | 32 |
| Turkey River | 153.3 | 475 |
| Turkey River - North Branch | 12.4 | 23 |
| Turkey River - West Branch | 10.6 | 11 |
| Twelvemile Creek (Thompson River tributary) | 39.4 | 39 |
| Twelvemile Creek (Wolf Creek (Cedar River tributary)) | 18.9 | 19 |
| Upper Iowa River | 133.4 | 212 |
| Village Creek (Des Moines River tributary) | 16.8 | 17 |
| Village Creek (Mississippi River tributary) | 23.7 | 24 |
| Volga River | 80.8 | 143 |
| Volga River - North Branch | 15.7 | 16 |
| Walnut Creek (Cedar Creek (Des Moines River tributary)) | 18.6 | 19 |
| Walnut Creek (Chariton River tributary) | 38.1 | 58 |
| Walnut Creek (Des Moines River tributary) | 17.4 | 17 |
| Walnut Creek (Grand River tributary) | 21.3 | 21 |
| Walnut Creek (Iowa River tributary) | 26.4 | 41 |
| Walnut Creek (Raccoon River tributary) | 23.5 | 24 |
| Walnut Creek (Skunk River tributary) | 13.3 | 53 |
| Walnut Creek (West Nishnabotna River tributary) | 66.3 | 81 |
| Wapsinonoc Creek | 13.6 | 49 |
| Wapsinonoc Creek - Middle Branch | 15.1 | 15 |
| Wapsinonoc Creek - West Branch | 20 | 20 |
| Wapsipinicon River | 295.3 | 798 |
| Wapsipinicon River - East Fork | 48 | 48 |
| Waterman Creek | 42.6 | 43 |
| Waubonsie Creek | 18.3 | 18 |
| Weldon River | 31.4 | 86 |
| West Buttrick Creek | 39.5 | 40 |
| West Cedar Creek | 19.5 | 20 |
| West Indian Creek | 20.8 | 21 |
| West Jackson Creek | 14.1 | 14 |
| West Mill Creek | 15.5 | 16 |
| West Nishnabotna River | 121.3 | 501 |
| West Nishnabotna River - East Branch | 40.7 | 41 |
| West Nishnabotna River - West Fork | 37.1 | 37 |
| West Nodaway River | 73.6 | 222 |
| West Otter Creek (Otter Creek (Boone River tributary)) | 14.6 | 15 |
| West Otter Creek (Otter Creek (Cedar River tributary)) | 16.1 | 16 |
| West Platte River | 11 | 11 |
| West Tarkio Creek | 39.9 | 48 |
| White Breast Creek | 92.2 | 126 |
| White Fox Creek | 33.4 | 49 |
| Whites Creek | 17.1 | 17 |
| Whitewater Creek | 31.4 | 52 |
| Wildcat Creek | 15.4 | 15 |
| Williams Creek | 18.8 | 19 |
| Willow Creek (Boyer River tributary) | 46.4 | 46 |
| Willow Creek (Floyd River tributary) | 35.8 | 67 |
| Willow Creek (Little Sioux River tributary) | 34.8 | 35 |
| Willow Creek (Little Sioux River tributary) | 26.2 | 26 |
| Willow Creek (Middle Raccoon River tributary) | 26.8 | 27 |
| Willow Creek (Mill Creek (Little Sioux River tributary)) | 17.3 | 33 |
| Willow Creek (Winnebago River tributary) | 22.2 | 22 |
| Winnebago River | 71.9 | 129 |
| Wolf Creek (Cedar Creek (Skunk River tributary)) | 16.2 | 16 |
| Wolf Creek (Cedar River tributary) | 73.1 | 106 |
| Wolf Creek (Chariton River tributary) | 20.8 | 21 |
| Yankee Run | 16 | 16 |
| Yellow River | 53.5 | 68 |
| Yellow River - North Fork | 14.5 | 15 |
