Browse lakes and reservoirs
Named lake-type waterbodies with a populated record: assessment verdicts, listed impairment causes, or a linked USGS gauge. Data updated 2026-08-17.
Waterbodies
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All New Hampshire 2,233 Minnesota 1,939 Wisconsin 1,219 Florida 973 Michigan 776 Vermont 712 Massachusetts 678 New Jersey 588 South Carolina 473 Illinois 439 New York 428 Washington 385 Texas 323 Kansas 304 Maine 302 Alabama 263 Nebraska 250 Pennsylvania 246 California 195 Virginia 193 Idaho 186 South Dakota 176 North Dakota 174 Oklahoma 173 Missouri 170 Iowa 167 Oregon 167 Indiana 162 Rhode Island 126 Colorado 122 Kentucky 108 Georgia 98 Connecticut 97 North Carolina 92 Utah 84 Louisiana 74 Tennessee 73 Arkansas 69 New Mexico 58 Montana 52 Nevada 50 Delaware 46 Arizona 44 West Virginia 44 Maryland 37 Mississippi 14 Alaska 12 Wyoming 8 Ohio 7 Hawaii 2
| Waterbody | State | Status | Causes |
|---|---|---|---|
| Basin Creek Lake | MT | Fully Supporting | 0 |
| Benton Lake | MT | Not Supporting | 5 |
| Big Lake | MT | Not Supporting | 1 |
| Big Moose Lake | MT | Fully Supporting | 0 |
| Black Canyon Lake | MT | Fully Supporting | 0 |
| Bynum Reservoir | MT | Fully Supporting | 0 |
| Canyon Ferry Reservoir | MT | Not Supporting | 5 |
| Clark Canyon Reservoir | MT | Not Supporting | 1 |
| Cooney Reservoir | MT | Fully Supporting | 0 |
| Elpestrine Lake | MT | Fully Supporting | 0 |
| Ennis Lake | MT | Not Supporting | 4 |
| Eureka Reservoir | MT | Fully Supporting | 0 |
| Flathead Lake | MT | Not Supporting | 4 |
| Fort Peck Reservoir | MT | Not Supporting | 2 |
| Freezeout Lake | MT | Not Supporting | 5 |
| Fresno Reservoir | MT | Not Supporting | 2 |
| Georgetown Lake | MT | Fully Supporting | 0 |
| Gibson Reservoir | MT | Fully Supporting | 0 |
| Halfbreed Lake | MT | Not Supporting | 1 |
| Hauser Lake | MT | Not Supporting | 8 |
| Holter Lake | MT | Not Supporting | 1 |
| Homestead Lake | MT | Fully Supporting | 0 |
| Hungry Horse Reservoir | MT | Fully Supporting | 0 |
| Hyalite Reservoir | MT | Fully Supporting | 0 |
| Lake Agnes | MT | Fully Supporting | 0 |
| Lake Bowdoin | MT | Not Supporting | 2 |
| Lake Elwell (Tiber Reservoir) | MT | Fully Supporting | 0 |
| Lake Frances (Francis) | MT | Fully Supporting | 0 |
| Lake Helena | MT | Not Supporting | 4 |
| Lake Koocanusa | MT | Not Supporting | 2 |
| Lake Mary Ronan | MT | Not Supporting | 1 |
| Lamesteer National Wildlife Refuge | MT | Not Supporting | 1 |
| Lebo Lake | MT | Fully Supporting | 0 |
| Lower Basin Creek Lake | MT | Fully Supporting | 0 |
| Lower Red Rock Lake | MT | Not Supporting | 2 |
| Medicine Lake | MT | Not Supporting | 3 |
| Nelson Reservoir | MT | Not Supporting | 2 |
| Nevada Lake | MT | Not Supporting | 5 |
| Noxon Reservoir | MT | Fully Supporting | 0 |
| Oilmont Wetland | MT | Not Supporting | 3 |
| Priest Butte Lake | MT | Not Supporting | 4 |
| Ruby River Reservoir | MT | Fully Supporting | 0 |
| Salmon Lake | MT | Fully Supporting | 0 |
| Seeley Lake | MT | Fully Supporting | 0 |
| Spidel Waterfowl Production Area | MT | Not Supporting | 3 |
| Swan Lake | MT | Not Supporting | 4 |
| Tongue River Reservoir | MT | Not Supporting | 3 |
| Upper Red Rock Lake | MT | Not Supporting | 2 |
| War Horse Lake | MT | Fully Supporting | 0 |
| Whitefish Lake | MT | Not Supporting | 2 |
Source: EPA ATTAINS and USGS National Water Information System State Integrated Report assessment decisions + USGS daily values · 2026