LaGrande Dam
| LaGrande Dam | |
|---|---|
.jpg) | |
 Interactive map of LaGrande Dam | |
| Location | Pierce County \ Thurston County |
| Coordinates | 46°49′22″N 122°18′15″W / 46.82281°N 122.30421°W |
| Status | Operational |
| Opening date | 1945[1] |
| Construction cost | $9.7 Million[1] |
| Owner | Tacoma Power[1] |
| Dam and spillways | |
| Impounds | Nisqually River |
| Height (foundation) | 217[1] |
| Height (thalweg) | 192[1] |
| Length | 710[1] |
| Width (crest) | 12[1] |
| Width (base) | 85[1] |
| Reservoir | |
| Creates | LaGrande Reservoir |
| LaGrande Powerhouse[1] | |
| Commission date | 1912 |
| Turbines | 4x 6 MW, 1x 40 MW[2] |
| Installed capacity | 64 MW[2] |
| Annual generation | 297.313 GWh[3] |
| Website https://www.mytpu.org/about-tpu/services/power/about-tacoma-power/dams-power-sources/nisqually-river-project/lagrande-dam/ | |
LaGrande Dam (or La Grande Dam) is a hydroelectric dam on the Nisqually River, on the border of Pierce County and Thurston County, Washington. LaGrande is the lesser of two coordinated dams on the Nisqually, situated two miles north (downstream) of the other, Alder Dam. Both are owned by Tacoma Power.[1]
Hydroelectric power was first produced from LaGrande in November 1912 as the first independent project of Tacoma Power.[4] The present structure was completed in 1945, the same year as Alder Dam's construction. At 192 feet high, the dam impounds about 2,700 acre-feet (3,300,000 m3) of water.
Neither LaGrande Dam nor its narrow two-mile-long impoundment, LaGrande Reservoir, is accessible to the public.
Hydroelectric power capacity
[edit]| Generator | Nameplate Capacity (MW)[2] |
|---|---|
| 1 | 6.0 |
| 2 | 6.0 |
| 3 | 6.0 |
| 4 | 6.0 |
| 5 | 40.0 |
| Total | 64.0 |
References
[edit]- ^ a b c d e f g h i j "LaGrande Dam". Tacoma Public Utilities. Retrieved March 21, 2026.
{{cite web}}: CS1 maint: url-status (link) - ^ a b c "January 2026: EIA 860M". Preliminary Monthly Electric Generator Inventory. U.S. Energy Information Administration. Retrieved 21 March 2026.
- ^ "2024: EIA-923". Form EIA-923 detailed data with previous form data. U.S. Energy Information Administration. Retrieved 21 March 2026.
- ^ "Tacoma City Light".
External links
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- Dams in Washington (state)
- United States power company dams
- Hydroelectric power plants in Washington (state)
- Buildings and structures in Pierce County, Washington
- Buildings and structures in Thurston County, Washington
- Dams completed in 1945
- Energy infrastructure completed in 1912
- 1912 establishments in Washington (state)
- Tacoma Public Utilities
- United States dam stubs