Overview
Hungry Horse Dam is 564-feet-high and has a variable-thickness concrete arch structure with a crest length of 2,115 ft. The dam and appurtenant works contain 3,086,200 cubic yards of concrete. The spillway is the highest morning-glory structure in the world. Water cascading over the spillway rim drops a maximum distance of 490 feet. The capacity of the spillway is 50,000 cubic feet per second, and the reservoir has a total capacity of 3,468,000 acre-feet.
Geology
Foundation: Siyeh limestone in regular beds (4,000 feet thick), made highly insoluble by impurities. Cut by one major and several minor shear zones, and one major bedding-plane slip.
General
| Project | Hungry Horse |
| Location | 9 miles SE of Columbia Falls, Montana |
| Longitude | -114.013023376 |
| Latitude | 48.34130 |
| Watercourse | South Fork of Flathead River |
| Reservoir | Hungry Horse |
| Original Construction | 1948-1953 |
| Modified Construction | 1994-1995 |
| National ID Number | MT00565 |
| Base Width | 330 ft |
| Dam Type | Concrete Thick Arch |
Dimensions
| Crest Elevation | 3548.0 ft |
| Structural Height | 564.0 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 520.0 ft |
| Crest Width | 39 ft |
| Volume of Dam Construction Materials | 2,934,500 cu yd |
| Spillway Crest Elevation | 3565.0 ft |
| Top of Active Conservation Pool (Elevation) | 3560.0 ft |
| Crest Length | 2115.0 ft |
Hydraulics & Hydrology
| Total Water Storage at Elevation | 3,467,179 acre-ft at 3560 |
| Spillway Capacity at Elevation | 50,000 cfs at 3565.0 ft |
| Uncontrolled Spillway Capacity at Elevation | 14,040 cfs at 3565.0 ft |
| Drainage Area | 1640 sq mi |
| Maximum Water Surface Elevation | 3562.3 ft |
| Normal Water Surface Elevation | 3336.0 ft |
| Spillway Type | Gated Morning Glory |
| Outlet Works Capacity at Elevation | 14,000 cfs hollow-jet valves; 9,000 cfs powerplant |
| Net Generation | 1,379,192,500 kWh |
Contact
