| Contention Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 94 |
| Continental Reservoir. | CO | Lake/Reservoir/Pond | Not Supporting | 1 | 374 |
| Contoocook Lake | NH | Impoundment | Not Supporting | 1 | 116 |
| Contoocook Lake | NH | Lake/Reservoir/Pond | Not Supporting | 3 | 227 |
| Contoocook Lake - Town Beach | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 1.28 |
| Contoocook River | NH | Impoundment | Not Supporting | 4 | 0.50 |
| Contoocook River - Camp Spaulding Beach | NH | Impoundment | Not Supporting | 1 | 1.38 |
| Contoocook River - Contoocook Village Dam | NH | Impoundment | Not Supporting | 1 | 110 |
| Contoocook River - Hoague-Sprague Dam | NH | Impoundment | Not Supporting | 1 | 2.00 |
| Contoocook River - Hopkinton Flood Control Dam | NH | Impoundment | Not Supporting | 1 | 220 |
| Contoocook River - Hosiery Mill Dam | NH | Impoundment | Not Supporting | 1 | 8.00 |
| Contoocook River - Monadnock Power Dam Pond | NH | Impoundment | Not Supporting | 1 | 40 |
| Contoocook River - Noone Mill Pond | NH | Impoundment | Not Supporting | 2 | 18 |
| Contoocook River - North Village Dam | NH | Impoundment | Not Supporting | 1 | 17 |
| Contoocook River - Paper Mill Dam | NH | Impoundment | Not Supporting | 1 | 5.00 |
| Contoocook River - Penacook Lower Falls | NH | Impoundment | Not Supporting | 2 | 8.50 |
| Contoocook River - Penacook Upper Falls Dam | NH | Impoundment | Not Supporting | 2 | 11 |
| Contoocook River - Pierce Power Dam | NH | Impoundment | Not Supporting | 2 | 3.50 |
| Contoocook River - Transcript Printing Co Dam | NH | Impoundment | Not Supporting | 2 | 2.50 |
| Contoocook River - York Dam Pond | NH | Impoundment | Not Supporting | 1 | 250 |
| Contoocook River Dam | NH | Impoundment | Not Supporting | 4 | 5.00 |
| Contra Loma Reservoir | CA | Lake/Reservoir/Pond | Not Supporting | 1 | 66 |
| Conway Lake | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 1,313 |
| Conway Lake - Town Beach | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 0.51 |
| Cook | MN | Lake, Freshwater | Not Supporting | 1 | 89 |
| Cook | VT | Lake, Freshwater | Fully Supporting | 0 | 3.00 |
| Cook Lake | IN | Lake, Freshwater | Not Supporting | 1 | 93 |
| Cook Lake Taylor's Beach | MI | Inland Lake Shoreline | Not Supporting | 1 | Filed in miles |
| Cooks (Shrwby) | VT | Lake, Freshwater | Fully Supporting | 0 | 12 |
| Cooks Pond | MA | Lake, Freshwater | Not Supporting | 4 | 21 |
| Cooks Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 33 |
| Cooks Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 246 |
| Cooks Pond-02050106002544 | PA | Lake/Reservoir/Pond | Fully Supporting | 0 | 33 |
| Cookstove Lake | SD | Lake/Reservoir/Pond | Not Supporting | 1 | 2.42 |
| Cool Run | NJ | Lake | Fully Supporting | 0 | 37 |
| Cooley Lake | WI | Lake, Freshwater | Not Supporting | 1 | 62 |
| Coon | MN | Lake, Freshwater | Not Supporting | 1 | 1,487 |
| Coon | MN | Lake, Freshwater | Not Supporting | 1 | 375 |
| Coon Brook- Coon Brook Bog Dam | NH | Impoundment | Not Supporting | 1 | 19 |
| Coon Creek (Lake Guntersville) | AL | Reservoir Embayment | Fully Supporting | 0 | 844 |
| Coon Fork Flowage | WI | Impoundment | Not Supporting | 1 | 62 |
| Coon Lake | FL | Lake, Freshwater | Not Supporting | 1 | 151 |
| Coon Lake | WI | Lake, Freshwater | Not Supporting | 1 | 42 |
| Coonamessett Pond | MA | Lake, Freshwater | Not Supporting | 2 | 159 |
| Cooney Reservoir | MT | Lake, Freshwater | Fully Supporting | 0 | 769 |
| Cooper Creek Reservoir | OR | Lake/Reservoir/Pond | Not Supporting | 3 | 136 |
| Cooper Lake | FL | Lake, Freshwater | Not Supporting | 1 | 78 |
| Cooper River (above Evesham Road) | NJ | Lake | Not Supporting | 10 | 49 |
| Cooper River (Rt 130 to Wallworth gage) | NJ | Lake | Not Supporting | 11 | 161 |
| Cooper River (Wallworth gage to Evesham Rd) | NJ | Lake | Not Supporting | 11 | 17 |