| <all other values> |
| Alabama |
| Allegheny |
| Altamaha-St. Marys |
| Androscoggin |
| Apalachicola |
| Arkansas-Keystone |
| Bear |
| Big Horn |
| Big Sandy-Guyandotte |
| Black Rock Desert-Humboldt |
| Boeuf-Tensas |
| Brazos Headwaters |
| Cape Fear |
| Central California Coastal |
| Central Lahontan |
| Central Nevada Desert Basins |
| Central Texas Coastal |
| Chariton-Grand |
| Cheyenne |
| Chippewa |
| Choctawatchee-Escambia |
| Choctawhatchee-Escambia |
| Chowan-Roanoke |
| Colorado Headwaters |
| Connecticut |
| Connecticut Coastal |
| Cumberland |
| Delaware |
| Des Moines |
| Eastern Lake Erie-Lake Erie |
| Edisto-Santee |
| Elkhorn |
| Escalante Desert-Sevier Lake |
| Galveston Bay-San Jacinto |
| Gasconade-Osage |
| Great Divide-Upper Green |
| Great Miami |
| Great Salt Lake |
| Green |
| Gunnison |
| James |
| Kanawha |
| Kansas |
| Kennebec |
| Kentucky-Licking |
| Klamath-Northern California Coastal |
| Kootenai-Pend Oreille-Spokane |
| Little Colorado |
| Louisiana Coastal |
| Loup |
| Lower Arkansas |
| Lower Brazos |
| Lower Canadian |
| Lower Chesapeake |
| Lower Cimarron |
| Lower Colorado |
| Lower Colorado-Lake Mead |
| Lower Colorado-San Bernard Coastal |
| Lower Columbia |
| Lower Gila |
| Lower Green |
| Lower Hudson-Long Island |
| Lower Illinois |
| Lower Mississippi |
| Lower Mississippi-Big Black |
| Lower Mississippi-Hatchie |
| Lower Mississippi-Lake Maurepas |
| Lower Mississippi-St. Francis |
| Lower Mississippi-Yazoo |
| Lower Missouri |
| Lower Ohio |
| Lower Pecos |
| Lower Red-Ouachita |
| Lower Rio Grande |
| Lower Snake |
| Lower Tennessee |
| Lower Yellowstone |
| Maine Coastal |
| Massachusetts-Rhode Island Coastal |
| Massachusetts-Rhode Island Coastal. |
| Merrimack |
| Middel Arkansas |
| Middle Brazos |
| Middle Columbia |
| Middle Gila |
| Middle Ohio |
| Middle Snake |
| Middle Tennessee-Elk |
| Middle Tennessee-Hiwassee |
| Milk |
| Minnesota |
| Mississippi Headwaters |
| Missouri Headwaters |
| Missouri-Big Sioux |
| Missouri-Little Missouri |
| Missouri-Little Sioux |
| Missouri-Marias |
| Missouri-Musselshell |
| Missouri-Nishnabotna |
| Missouri-Oahe |
| Missouri-Poplar |
| Missouri-White |
| Mobile-Tombigbee |
| Monongahela |
| Muskingum |
| Neches |
| Neosho-Verdigris |
| Neuse-Pamlico |
| Niobrara |
| North Canadian |
| North Lahontan |
| North Platte |
| Northeastern Lake Michigan-Lake Michigan |
| Northeastern Lake Ontario-Lake Ontario-St. Lawrence |
| Northern Mojave-Mono Lake |
| Northestern Lake Ontario-Lake Ontario-St. Lawrence |
| Northwestern Lake Huron |
| Northwestern Lake Michigan |
| Nueces-Southwestern Texas Coastal |
| Ochlockonee |
| Ogechee-Savannah |
| Ogeechee-Savannah |
| Oregon Closed Basins |
| Oregon-Washington Coastal |
| Pascagoula |
| Peace-Tampa Bay |
| Pearl |
| Pee Dee |
| Penobscot |
| Platte |
| Potomac |
| Powder-Tongue |
| Puget Sound |
| Rainy |
| Red |
| Red Headwaters |
| Red-Sulphur |
| Red-Washita |
| Republican |
| Richelieu |
| Rio Grande Closed Basins |
| Rio Grande Headwaters |
| Rio Grande-Amistad |
| Rio Grande-Elephant Butte |
| Rio Grande-Falcon |
| Rio Grande-Mimbres |
| Rio Grandes-Mimbres |
| Rock |
| Sabine |
| Saco |
| Sacramento |
| Salt |
| San Francisco Bay |
| San Joaquin |
| San Juan |
| Saskatchewan |
| Scioto |
| Smoky Hill |
| Sonora |
| Souris |
| South Platte |
| Southeastern Lake Michigan |
| Southeastern Lake Ontario |
| Southern California Coastal |
| Southern Flordia |
| Southern Florida |
| Southern Lake Erie |
| Southern Lake Superior-Lake Superior |
| Southern Mojave-Salton Sea |
| Southern Mojave-Salton Sea. |
| Southwestern Lake Huron-Lake Huron |
| Southwestern Lake Michigan |
| Southwestern Lake Ontario |
| St. Clair-Detroit |
| St. Croix |
| St. Francois |
| St. John |
| St. Johns |
| Susquehanna |
| Suwannee |
| Trinity |
| Tulare-Buena Vista Lakes |
| Upper Arkansas |
| Upper Canadian |
| Upper Chesapeake |
| Upper Cimarron |
| Upper Colorado |
| Upper Colorado-Dirty Devil |
| Upper Colorado-Dolores |
| Upper Columbia |
| Upper Gila |
| Upper Hudson |
| Upper Illinois |
| Upper Mississippi-Black-Root |
| Upper Mississippi-Iowa-Skunk-Wapsipinicon |
| Upper Mississippi-Kaskaskia-Meramec |
| Upper Mississippi-Maquoketa-Plum |
| Upper Mississippi-Salt |
| Upper Ohio |
| Upper Pecos |
| Upper Snake |
| Upper Tennessee |
| Upper White |
| Upper Yellowstone |
| Wabash |
| Western Lake Erie |
| Western Lake Superior |
| White-Yampa |
| Willamette |
| Williamette |
| Wisconsin |
| Yakima |
