| Cascade | MN | Lake, Freshwater | Not Supporting | 1 | 445 |
| Cascade Alpine Brook | NH | Impoundment | Not Supporting | 1 | 1.00 |
| Cascade Brook - Cascade Brook Dam | NH | Impoundment | Not Supporting | 1 | 2.50 |
| Cascade Brook - Currier Wildlife Pond | NH | Impoundment | Not Supporting | 1 | 0.30 |
| Cascade Brook - Recreation Pond Dam | NH | Impoundment | Not Supporting | 1 | 0.05 |
| Cascade Lake | FL | Lake, Freshwater | Not Supporting | 3 | 126 |
| Cascade Reservoir | ID | Lake, Freshwater | Not Supporting | 2 | 25,040 |
| Casco Bay Coastal Drainages | ME | Lake, Freshwater | Fully Supporting | 0 | 368 |
| Case Lake | NY | Lake/Reservoir/Pond | Not Supporting | 1 | 0.20 |
| Casey | MN | Lake, Freshwater | Not Supporting | 1 | 58 |
| Casey Lake (aka Hickory Hills Lake) | IA | Lake | Not Supporting | 1 | 54 |
| Casey's Slough | SD | Lake/Reservoir/Pond | Not Supporting | 1 | 115 |
| Cash Lake | MD | Impoundment | Not Supporting | 1 | 55 |
| Casitas, Lake | CA | Lake/Reservoir/Pond | Not Supporting | 1 | 2,423 |
| Caskey Lake | WA | Lake/Reservoir/Pond | Not Supporting | 1 | 13 |
| Caspian | VT | Lake, Freshwater | Fully Supporting | 0 | 158 |
| Caspian | VT | Lake, Freshwater | Fully Supporting | 0 | 631 |
| Cass Lake | MI | Lake, Freshwater | Not Supporting | 3 | 1,311 |
| Cass Lake Committee Association Beach | MI | Inland Lake Shoreline | Not Supporting | 1 | Filed in miles |
| Cass Lake Keego Harbor City Beach | MI | Inland Lake Shoreline | Not Supporting | 1 | Filed in miles |
| Cass Lake Woods | MI | Inland Lake Shoreline | Not Supporting | 1 | Filed in miles |
| Cass Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 54 |
| Cass Pond - Camp Takodah Beach | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 1.38 |
| Cass Pond Beach | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 0.46 |
| Casselton Reservoir | ND | Reservoir | Fully Supporting | 0 | 17 |
| Cassidy Lake | FL | Lake, Freshwater | Fully Supporting | 0 | 340 |
| Cassidy Lake | WA | Lake/Reservoir/Pond | Not Supporting | 2 | 123 |
| Castac Lake | CA | Lake/Reservoir/Pond | Not Supporting | 1 | 315 |
| Castaic Lake | CA | Lake/Reservoir/Pond | Not Supporting | 1 | 2,231 |
| Castle Rock Dam | ND | Reservoir | Fully Supporting | 0 | 12 |
| Castle Rock Lake | WI | Reservoir | Not Supporting | 2 | 12,386 |
| Castleman Run Lake | WV | Lake/Reservoir/Pond | Not Supporting | 3 | 19 |
| Caswell Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 14 |
| Cat Lakes | ID | Lake, Freshwater | Fully Supporting | 0 | 7.08 |
| Catahoula Lake | LA | Lake, Freshwater | Not Supporting | 3 | 16,509 |
| Catamont Pond | NY | Lake/Reservoir/Pond | Not Supporting | 1 | 13 |
| Catamount Lake | CO | Lake/Reservoir/Pond | Not Supporting | 1 | 511 |
| Catamount Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 16 |
| Catamount Pond - Bear Brook State Park Beach | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 0.68 |
| Cataract Lake | AZ | Lake, Freshwater | Fully Supporting | 0 | 38 |
| CATAWBA RIVER (Lake Norman below elevation 760) | NC | Reservoir | Not Supporting | 2 | 31,332 |
| CATAWBA RIVER (Lake Wylie below elevation 570) | NC | Reservoir | Not Supporting | 1 | 375 |
| CATAWBA RIVER (Lake Wylie below elevation 570) | NC | Reservoir | Not Supporting | 1 | 601 |
| CATAWBA RIVER (Lake Wylie below elevation 570) North Carolina portion | NC | Reservoir | Not Supporting | 1 | 4,294 |
| CATAWBA RIVER (Lake Wylie South FK Catawba Arm) North Carolina portion | NC | Reservoir | Not Supporting | 3 | 1,291 |
| CATAWBA RIVER (Mountain Island Lake below elevation 648) | NC | Reservoir | Not Supporting | 1 | 1,937 |
| Catclaw Lake | MO | Reservoir | Not Supporting | 1 | 42 |
| Cate Brook - Crowley Pond | NH | Impoundment | Not Supporting | 1 | 0.25 |
| Caterpillar Slough | WA | Lake/Reservoir/Pond | Not Supporting | 1 | 42 |
| Cates Brook Dam | NH | Impoundment | Not Supporting | 1 | 0.51 |