It forms the project's largest reservoir, Carpenter Lake west of Lillooet.

The difference in elevation between Carpenter Lake, the reservoir formed by Terzaghi Dam, and the two powerhouses on Seton Lake is c. 410 m, which in combination with the flow of the entire Bridge River generates 480 megawatts in electrical power.

[3] Completed in the 1950s, it was the expansion of a concept first launched in the 1920s by the Bridge River Power Development Co. but abandoned due to rising costs and collapsed investments as a result of the Great Depression.

It was later resumed by BC Electric during the post-war boom after World War II and a first diversion and powerhouse completed in 1948 (180MW), the second in 1960 (300MW).

This article about a location in the Cariboo Regional District, Canada is a stub.