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 1–50 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 |
|---|---|---|---|
| O'Brien (north portion) | MN | Not Supporting | 1 |
| O'Brien (south portion) | MN | Not Supporting | 1 |
| O'Brien Lake | WI | Fully Supporting | 0 |
| O'Brien Lake (Mill Creek Site 13) | WV | Not Supporting | 1 |
| O'brien Recreation Dam | NH | Not Supporting | 1 |
| O'Dowd | MN | Not Supporting | 2 |
| O'Leary | MN | Not Supporting | 1 |
| O'Reilly | MN | Fully Supporting | 0 |
| O. C. Fisher Lake | TX | Fully Supporting | 0 |
| Oak | MN | Not Supporting | 3 |
| Oak | MN | Not Supporting | 2 |
| Oak Creek Reservoir | TX | Fully Supporting | 0 |
| Oak Lake | NE | Not Supporting | 2 |
| Oak Lake | SD | Not Supporting | 2 |
| Oak Mountain State Park Lakes | AL | Fully Supporting | 0 |
| Oak St. Beach | IL | Not Supporting | 2 |
| Oakachoy Creek (Lake Martin) | AL | Fully Supporting | 0 |
| Oakland | IL | Not Supporting | 4 |
| Oakland Pond | MA | Not Supporting | 1 |
| Oakridge Subdivision | MI | Not Supporting | 1 |
| Oaks Park Reservoir | UT | Fully Supporting | 0 |
| Oasis Lake County Park Beach | MI | Not Supporting | 1 |
| Occom Pond | NH | Not Supporting | 1 |
| Occoquan Reservoir | VA | Not Supporting | 1 |
| Occoquan Reservoir | VA | Not Supporting | 2 |
| Ocean Lake | WY | Not Supporting | 1 |
| Ocean Pond | FL | Not Supporting | 4 |
| Ocheda (West Basin) | MN | Not Supporting | 1 |
| Ocheesee Pond | FL | Not Supporting | 1 |
| Ochoco Reservoir | OR | Not Supporting | 2 |
| Ocoee Number 2 Reservoir | TN | Fully Supporting | 0 |
| Ocoee Number 3 Reservoir | TN | Not Supporting | 3 |
| Oconee Lake | GA | Fully Supporting | 0 |
| Oconee Lake | GA | Fully Supporting | 0 |
| Oconee Lake | GA | Fully Supporting | 0 |
| Oconomowoc Lake | WI | Fully Supporting | 0 |
| Octoraro Lake-02050306002281 | PA | Not Supporting | 1 |
| Odell Lake | OR | Not Supporting | 5 |
| Odessa Lake (Old) | MO | Not Supporting | 1 |
| Odiorne Pond | NH | Not Supporting | 2 |
| Odland Dam | ND | Fully Supporting | 0 |
| Offutt Lake | NE | Not Supporting | 1 |
| Offutt Lake | WA | Not Supporting | 1 |
| Ogallala City Park Lake | NE | Not Supporting | 1 |
| Ogden City Lake | KS | Not Supporting | 1 |
| Ogishkemuncie | MN | Not Supporting | 1 |
| Ogontz Brook | NH | Not Supporting | 1 |
| Ogontz Lake | NH | Not Supporting | 1 |
| Ogontz Lake - Ogontz Equestrian Ctr/Camp Beach | NH | Not Supporting | 1 |
| Ogrens | MN | Not Supporting | 1 |
Source: EPA ATTAINS and USGS National Water Information System State Integrated Report assessment decisions + USGS daily values · 2026