Boundary Dam
title: "Boundary Dam" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["dams-in-washington-(state)", "seattle-city-light-dams", "hydroelectric-power-plants-in-washington-(state)", "buildings-and-structures-in-pend-oreille-county,-washington", "united-states-power-company-dams", "dams-completed-in-1967", "energy-infrastructure-completed-in-1967", "dams-on-the-pend-oreille-river", "arch–gravity-dams", "national-register-of-historic-places-in-pend-oreille-county,-washington", "dams-on-the-national-register-of-historic-places-in-washington-(state)", "1967-establishments-in-washington-(state)"] topic_path: "geography/united-states" source: "https://en.wikipedia.org/wiki/Boundary_Dam" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::data[format=table title="Infobox dam"]
| Field | Value |
|---|---|
| name | Boundary Dam |
| image | Eggshell face of Boundary Dam (3942410819).jpg |
| location_map | Washington |
| coordinates | |
| country | United States |
| location | Pend Oreille County, Washington |
| status | O |
| opening | 1967 |
| owner | City of Seattle |
| dam_type | Arch-gravity |
| dam_height | 340 ft |
| dam_length | 740 ft |
| dam_crosses | Pend Oreille River |
| res_capacity_total | 95000 acre.ft |
| res_catchment | 25200 sqmi |
| res_surface | 1668 acre |
| plant_capacity | 1,003.25 MW |
| plant_annual_gen | 3,587 GWh |
| :: |
| name = Boundary Dam | name_official = | image = Eggshell face of Boundary Dam (3942410819).jpg | image_size = | image_caption = | image_alt = | location_map = Washington | location_map_size = | location_map_caption = | coordinates = | country = United States | location = Pend Oreille County, Washington | status = O | construction_began = | opening = 1967 | demolished = | cost = | owner = City of Seattle | dam_type = Arch-gravity | dam_height = 340 ft | dam_height_thalweg = | dam_height_foundation= | dam_length = 740 ft | dam_width_crest = | dam_width_base = | dam_volume = | dam_elevation_crest = | dam_crosses = Pend Oreille River | spillway_count = | spillway_type = | spillway_capacity = | res_name = | res_capacity_total = 95000 acre.ft | res_capacity_active = | res_capacity_inactive= | res_catchment = 25200 sqmi | res_surface = 1668 acre | res_elevation = | res_max_depth = | res_max_length = | res_max_width = | res_tidal_range = | plant_operator = | plant_commission = | plant_decommission = | plant_type = | plant_turbines = | plant_capacity = 1,003.25 MW | plant_annual_gen = 3,587 GWh | website = | extra = Boundary Dam is a concrete arch gravity-type hydroelectric dam, finished in 1967, on the Pend Oreille River, in the U.S. state of Washington. The dam is located in the northeast corner of Washington state. It is operated by Seattle City Light and makes up a significant portion of the City of Seattle's energy portfolio. On average, it provides upwards of 46% of the power generated by Seattle City Light. Boundary Powerhouse, located adjacent to the dam, is completely built inside of the rock that makes up the left abutment of the dam itself. It has a nameplate capacity of just over 1 gigawatt of generation. The component of the hydroelectric project were listed on the National Register of Historic Places in 2018.
The 1997 film The Postman was partially filmed at the dam. A facade of the town (Bridge City in the film) appeared on the face of the dam for a period of time that year.
Climate
|location = Boundary Dam, Washington, 1991–2020 normals: 1837ft (560m) |single line = Yes
|Jan high F = 32.6 |Feb high F = 38.3 |Mar high F = 47.5 |Apr high F = 58.0 |May high F = 67.2 |Jun high F = 72.4 |Jul high F = 83.6 |Aug high F = 84.6 |Sep high F = 72.9 |Oct high F = 55.7 |Nov high F = 40.3 |Dec high F = 32.2 |year high F =
|Jan mean F = 26.7 |Feb mean F = 29.9 |Mar mean F = 37.1 |Apr mean F = 45.3 |May mean F = 54.0 |Jun mean F = 60.1 |Jul mean F = 67.8 |Aug mean F = 67.2 |Sep mean F = 57.8 |Oct mean F = 45.2 |Nov mean F = 34.2 |Dec mean F = 26.8 |year mean F =
|Jan low F = 20.9 |Feb low F = 21.5 |Mar low F = 26.8 |Apr low F = 32.6 |May low F = 40.9 |Jun low F = 47.8 |Jul low F = 52.0 |Aug low F = 49.8 |Sep low F = 42.6 |Oct low F = 34.6 |Nov low F = 28.1 |Dec low F = 21.4 |year low F =
|precipitation colour = green |Jan precipitation inch = 3.10 |Feb precipitation inch = 1.98 |Mar precipitation inch = 2.35 |Apr precipitation inch = 2.21 |May precipitation inch = 2.60 |Jun precipitation inch = 3.18 |Jul precipitation inch = 1.42 |Aug precipitation inch = 0.81 |Sep precipitation inch = 1.32 |Oct precipitation inch = 2.40 |Nov precipitation inch = 3.23 |Dec precipitation inch = 3.60 |year precipitation inch =
|Jan snow inch = 18.50 |Feb snow inch = 7.70 |Mar snow inch = 3.40 |Apr snow inch = 0.10 |May snow inch = 0.00 |Jun snow inch = 0.00 |Jul snow inch = 0.00 |Aug snow inch = 0.00 |Sep snow inch = 0.00 |Oct snow inch = 0.10 |Nov snow inch = 6.80 |Dec snow inch = 18.20 |year snow inch =
|source 1 = NOAA |url = https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&startDate=0001-01-01&endDate=9996-12-31&stations=USC00450844&format=pdf |title = Boundary Dam, Washington 1991-2020 Monthly Normals |access-date = August 14, 2023
References
References
- link. (2011-07-16 , NPDP Dam Directory)
- "Seattle City Light - Boundary Hydroelectric Project | Home".
- "Carbon Monitoring for Action".
- "Seattle City Light: Boundary Project".
- [https://www.seattle.gov/cityarchives/exhibits-and-education/online-exhibits/boundary-dam Seattle Municipal Archives – Boundary Dam]
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