# List of dams and reservoirs in Idaho

This is a list of dams and reservoirs in the U.S. state of Idaho.
Key :
| †Located on state border | S=State of Idaho | USACE=U.S. Army Corps of Engineers | USBR=U.S. Bureau of Reclamation |
| Name | River | Type | Height | Height | Reservoir | Capacity | Capacity | Capacity | Owner | Built |
| | | | Ft | m | | acre.ft | km$^3$ | MW | | |
| Albeni Falls Dam | Pend Oreille River | Concrete gravity | 90 | 27 | Lake Pend Oreille | 1,153,000 | 1.422 | ? | USACE | 1955 |
| Alexander Dam | Bear River | Concrete gravity | 94 | 29 | Alexander Reservoir | 15,760 | 0.01944 | 14 | PacifiCorp | 1925 |
| American Falls Dam | Snake River | Concrete gravity | 94 | 29 | American Falls Reservoir | 1,671,300 | 2.0615 | 112 | USBR | 1978 |
| Anderson Ranch Dam | South Fork Boise River | Earthfill | 456 | 139 | Anderson Ranch Reservoir | 503,500 | 0.6211 | 40 | USBR | 1950 |
| Black Canyon Diversion Dam | Payette River | Concrete gravity | 183 | 56 | Black Canyon Reservoir | 31,200 | 0.0385 | 10 | USBR | 1924 |
| Arrowrock Dam | Boise River | Concrete arch | 350 | 110 | Arrowrock Reservoir | 300,850 | 0.37109 | 0 | USBR | 1915 |
| Blackfoot Dam | Blackfoot River | Earthfill | 55 | 17 | Blackfoot Reservoir | 417,000 | 0.514 | 0 | Idaho Bureau of Indian Affairs | 1911 |
| Bliss Dam | Snake River | Concrete gravity | 70 | 21 | Bliss Reservoir | 11,000 | 0.014 | 75 | Idaho Power | 1950 |
| Brownlee Dam† | Snake River | Earthfill | 420 | 130 | Brownlee Reservoir | 1,426,700 | 1.7598 | 585.4 | Idaho Power | 1958 |
| C. J. Strike Dam | Snake River | Earthfill | 115 | 35 | C. J. Strike Reservoir | 247,000 | 0.305 | 82.8 | Idaho Power | 1952 |
| Cabinet Gorge Dam | Clark Fork | Concrete arch | 111 | 34 | Cabinet Gorge Reservoir | 106,000 | 0.131 | 231 | Avista Utilities | 1953 |
| Cascade Dam | North Fork Payette River | Earthfill | 107 | 33 | Lake Cascade | 693,100 | 0.8549 | 12.4 | USBR | 1948 |
| Cedar Creek Dam | Cedar Creek | Earthfill | 84 | 26 | Cedar Creek Reservoir | 30,000 | 0.037 | 0 | Cedar Mesa Canal & Reservoir Co. | 1920 |
| Crane Creek Dam | Crane Creek | Earthfill | 55 | 17 | Crane Creek Reservoir | 56,800 | 0.0701 | ? | Crane Creek Reservoir Administrative Board | 1912 |
| Deadwood Dam | Deadwood River | Concrete arch | 165 | 50 | Deadwood Reservoir | 154,000 | 0.190 | 0 | USBR | 1931 |
| Dworshak Dam | North Fork Clearwater River | Concrete gravity | 717 | 219 | Dworshak Reservoir | 3,468,000 | 4.278 | 460 | USACE | 1973 |
| Fish Creek Dam | Fish Creek | Concrete multiple arch | 88 | 27 | Fish Creek Reservoir | 12,743 | 0.015718 | 0 | Carey Valley Reservoir Co. | 1923 |
| Hells Canyon Dam† | Snake River | Concrete gravity | 330 | 100 | Hells Canyon Reservoir | 188,000 | 0.232 | 391 | Idaho Power | 1967 |
| Island Park Dam | Henrys Fork | Earthfill | 94 | 29 | Island Park Reservoir | 135,205 | 0.166773 | 0 | USBR | 1939 |
| Little Camas Dam | Little Camas Creek | Earthfill | 44 | 13 | Little Camas Reservoir | 18,400 | 0.0227 | 0 | Mountain Home Irrigation District | 1912 |
| Little Wood River Dam | Little Wood River | Earthfill | 169 | 52 | Little Wood River Reservoir | 33,300 | 0.0411 | 3 | USBR | 1939 |
| Lucky Peak Dam | Boise River | Earthfill | 340 | 100 | Lucky Peak Lake | 307,000 | 0.379 | 101 | USACE | 1955 |
| Mackay Dam | Big Lost River | Earthfill | 67 | 20 | Mackay Reservoir | 45,000 | 0.056 | 0 | Big Lost River Irrigation District | 1918 |
| Magic Dam | Big Wood River | Earthfill | 128 | 39 | Magic Reservoir | 195,000 | 0.241 | 9 | Magic Reservoir Hydroelectric, Inc. | 1910 |
| McArthur Lake | Deep Creek | Earthfill | | | McArthur Lake | | | | Idaho Fish and Game | 1942 |
| Milner Dam | Snake River | Rockfill | 73 | 22 | Milner Lake | 36,300 | 0.0448 | 58.3 | Milner Dam, Inc. | 1905 |
| Minidoka Dam | Snake River | Earthfill/concrete | 86 | 26 | Lake Walcott | 210,200 | 0.2593 | 28 | USBR | 1906 |
| Mormon Dam | McKinney Creek | Earthfill | 23 | 7.0 | Mormon Reservoir | 19,280 | 0.02378 | 0 | Twin Lakes Reservoir & Irrigation Co. | 1908 |
| Oakley Dam | Goose Creek | Earthfill | 139 | 42 | Lower Goose Creek Reservoir | 76,000 | 0.094 | 0 | Oakley Canal Co. | 1916 |
| Oneida Dam | Bear River | Concrete gravity | 102 | 31 | Oneida Narrows Reservoir | 11,400 | 0.0141 | 30 | PacifiCorp | 1913 |
| Paddock Valley Dam | Little Willow Creek | Earthfill | 43 | 13 | Paddock Valley Reservoir | 36,400 | 0.0449 | 0 | Little Willow Irrigation District | 1949 |
| Ririe Dam | Willow Creek | Earthfill | 253 | 77 | Ririe Reservoir | 100,500 | 0.1240 | 0 | USBR | 1977 |
| Oxbow Dam† | Snake River | Rockfill | 175 | 53 | Oxbow Reservoir | 58,200 | 0.0718 | 190 | Idaho Power | 1961 |
| Palisades Dam | Snake River | Earthfill | 270 | 82 | Palisades Reservoir | 1,200,000 | 1.5 | 176.5 | USBR | 1957 |
| Post Falls Dam | Spokane River | Concrete gravity | 57.8 | 17.6 | Coeur d'Alene Lake | 225,000 | 0.278 | 14.75 | Avista Utilities | 1906 |
| Priest Lake Dam | Priest River | Concrete gravity | 8 | 2.4 | Priest Lake | 143,000 | 0.176 | ? | Idaho Department of Water Resources | 1978 |
| Sage Hen Dam | Sage Hen Creek | Earthfill | 38 | 12 | Sage Hen Reservoir | 5,210 | 0.00643 | 0 | Squaw Creek Irrigation Company | 1938 |
| Salmon Falls Dam | Salmon Falls Creek | Concrete arch | 217 | 66 | Salmon Falls Creek Reservoir | 230,650 | 0.28450 | 0 | Salmon River Canal Co. | 1911 |