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.

On average, it provides upwards of 46% of the power generated by Seattle City Light.

The component of the hydroelectric project were listed on the National Register of Historic Places in 2018.

A facade of the town (Bridge City in the film) appeared on the face of the dam for a period of time that year.