| Clement Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 111 |
| Clement Pond - Camp Merrimac Beach | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 1.38 |
| Clemson Pond | NH | Impoundment | Not Supporting | 2 | 5.67 |
| Clouds, Lakes of the | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 0.62 |
| Clough Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 13 |
| Clough Pond | NH | Lake/Reservoir/Pond | Not Supporting | 3 | 44 |
| Clough Pond - Town Beach | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 1.28 |
| Club Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 40 |
| Cobbetts Pond | NH | Lake/Reservoir/Pond | Not Supporting | 6 | 301 |
| Cobbetts Pond - Dunkan Beach | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 1.38 |
| Cobbetts Pond - Town Beach | NH | Lake/Reservoir/Pond | Not Supporting | 3 | 0.53 |
| Cocheco River - Central Ave Dam | NH | Impoundment | Not Supporting | 2 | 20 |
| Cocheco River - City Dam 1 | NH | Impoundment | Not Supporting | 5 | 50 |
| Cocheco River - Cocheco Dam I | NH | Impoundment | Not Supporting | 1 | 4.00 |
| Cocheco River - Gonic Dam Pond | NH | Impoundment | Not Supporting | 3 | 18 |
| Cocheco River - Hatfield Dam | NH | Impoundment | Not Supporting | 3 | 1.00 |
| Cocheco River - Mill Pond Dam | NH | Impoundment | Not Supporting | 1 | 4.00 |
| Cocheco River - Watson Waldron Dam | NH | Impoundment | Not Supporting | 2 | 54 |
| Coffin Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 16 |
| Coffin Pond Dam - Drakes River | NH | Impoundment | Not Supporting | 1 | 1.02 |
| Colby Brook | NH | Impoundment | Not Supporting | 1 | 0.10 |
| Colby Brook - Diamond Pond | NH | Impoundment | Not Supporting | 1 | 11 |
| Colcord Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 8.17 |
| Cold Brook | NH | Impoundment | Not Supporting | 1 | 1.32 |
| Cold Brook | NH | Impoundment | Not Supporting | 1 | 0.25 |
| Cold Brook - Mill Brook | NH | Impoundment | Not Supporting | 3 | 2.00 |
| Cold Brook Dam | NH | Impoundment | Not Supporting | 1 | 0.25 |
| Cold Brook Dam | NH | Impoundment | Not Supporting | 1 | 2.10 |
| Cold Brook Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 4.35 |
| Cold Pond | NH | Lake/Reservoir/Pond | Not Supporting | 4 | 14 |
| Cold River - Vilas Pond | NH | Impoundment | Not Supporting | 1 | 4.19 |
| Cold River - Vilas Pool Beach | NH | Impoundment | Not Supporting | 2 | 1.38 |
| Cold River - Water Supply I | NH | Impoundment | Not Supporting | 1 | 2.00 |
| Cold Spring Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 31 |
| Cold Spring Pond Dam | NH | Impoundment | Not Supporting | 1 | 0.33 |
| Coldrain Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 18 |
| Cole Marsh Pond Dam | NH | Impoundment | Not Supporting | 1 | 5.50 |
| Cole Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 17 |
| Colleague Pond | NH | Lake/Reservoir/Pond | Not Supporting | 1 | 7.00 |
| Collins Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 11 |
| Commerce Park Wildlife Pond Dam | NH | Impoundment | Not Supporting | 1 | 7.60 |
| Conc/Beaver Dam | NH | Impoundment | Not Supporting | 1 | 0.15 |
| Cone Pond | NH | Lake/Reservoir/Pond | Not Supporting | 2 | 9.03 |
| Connecticut River - Bellows Falls | NH | Impoundment | Not Supporting | 2 | 1,720 |
| Connecticut River - Canaan Hydro | NH | Impoundment | Not Supporting | 2 | 20 |
| Connecticut River - Comerford Storage Dam | NH | Impoundment | Not Supporting | 1 | 1,093 |
| Connecticut River - Dodge Falls | NH | Impoundment | Not Supporting | 1 | 290 |
| Connecticut River - Dodge Falls (Tailrace of Mcindoes Dam) | NH | Impoundment | Not Supporting | 1 | 10 |
| Connecticut River - Gilman Dam Pond | NH | Impoundment | Not Supporting | 2 | 3,800 |
| Connecticut River - Mcindoes Reservoir | NH | Impoundment | Not Supporting | 1 | 545 |