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
Showing 151–200 of 269 starting with O
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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 |
|---|---|---|---|
| Oroville, Lake | CA | Not Supporting | 1 |
| Orrs Pond | MA | Not Supporting | 1 |
| Orwell | MN | Not Supporting | 2 |
| Osage City Reservoir | KS | Not Supporting | 1 |
| Osage Co. SFL | KS | Fully Supporting | 0 |
| Osakis | MN | Not Supporting | 3 |
| Osanippa Creek (Lake Harding) | AL | Not Supporting | 1 |
| Osawatomie City Lake | KS | Not Supporting | 1 |
| Oscar | MN | Not Supporting | 1 |
| Oscar Young Dam | NH | Not Supporting | 1 |
| Oscawana Lake | NY | Not Supporting | 1 |
| Osgood Pond | NH | Not Supporting | 1 |
| Osgood Pond | NY | Not Supporting | 1 |
| Oslo | MN | Not Supporting | 1 |
| Osmore | VT | Fully Supporting | 0 |
| Osmore | VT | Fully Supporting | 0 |
| Osmun Lake | MI | Not Supporting | 3 |
| Oso Flaco Lake | CA | Not Supporting | 1 |
| Osoyoos Lake | WA | Not Supporting | 2 |
| Osoyoos Lake | WA | Not Supporting | 4 |
| Osoyoos Lake | WA | Not Supporting | 1 |
| Osprey | IL | Not Supporting | 5 |
| Osprey Lake | WI | Fully Supporting | 0 |
| Ossawinnamakee | MN | Not Supporting | 1 |
| Ossipee Lake | NH | Not Supporting | 2 |
| Ossipee Lake - Camp Calumet Beach | NH | Not Supporting | 1 |
| Ossipee Lake - Camp Cody for Boys Beach | NH | Not Supporting | 1 |
| Ossipee Lake - Deer Cove Pb Beach | NH | Not Supporting | 1 |
| Ossipee Lake - Ossipee Lake Natural Area | NH | Not Supporting | 2 |
| Ossipee River | ME | Fully Supporting | 0 |
| Osterhout Lake | MI | Not Supporting | 1 |
| Oswego Lake | IN | Not Supporting | 1 |
| Oswego Lake | WI | Fully Supporting | 0 |
| Oswego River (above Rt 539) | NJ | Not Supporting | 3 |
| Oswego River (Andrews Rd to Sim Place Resv) | NJ | Not Supporting | 2 |
| Oswego River (below Andrews Road) | NJ | Not Supporting | 1 |
| Otay Reservoir, Lower | CA | Not Supporting | 8 |
| Otis Creek Lake (Eureka) | KS | Fully Supporting | 0 |
| Otis Reservoir | MA | Not Supporting | 1 |
| Otisco Lake | NY | Not Supporting | 1 |
| Otsego Lake | MI | Not Supporting | 1 |
| Ottawa Co. SFL | KS | Not Supporting | 3 |
| Ottawa Lake | MI | Not Supporting | 3 |
| Ottawa Lake | WI | Fully Supporting | 0 |
| Otter | IL | Not Supporting | 2 |
| Otter | MN | Not Supporting | 1 |
| Otter | MN | Not Supporting | 1 |
| Otter Brook | NH | Not Supporting | 1 |
| Otter Brook | NH | Not Supporting | 1 |
| Otter Brook | NH | Not Supporting | 1 |
Source: EPA ATTAINS and USGS National Water Information System State Integrated Report assessment decisions + USGS daily values · 2026