Boundary Dam

The Boundary Dam is a concrete arch-gravity dam across the Pend Oreille River, located in the U.S. state of Washington, in the northeast corner of the state. Completed in 1967 for the conventional generation of hydroelectricity, the dam is operated by Seattle City Light and generates a significant portion of the City of Seattle's energy portfolio. On average, it provides between 46 and 60 percent of the power generated by Seattle City Light. The dam wall is 338 feet (103 m) high and 738 feet (225 m) long. The underground powerhouse, called the Boundary Dam Hydro Power Plant, is completely built inside of the rock that makes up the left abutment of the dam wall. It has a nameplate capacity of just over 1 gigawatt (1, 300, 000 hp) of generation. The hydroelectric project was 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.

Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).