This was to generate electric power for the City.
Water typically passes through Masonry Dam through penstocks driving two turbines.

In 1914, the Seattle began building a masonry dam on the Cedar River between Cedar Lake and Rattlesnake Lake.

The dam was needed to impound water to generate electric power for City Light. Chester Morse Lake (originally Cedar Lake) is a lake in the upper region of the Cedar River watershed in the U.S. state of Washington.The original lake surface was 1,530 feet (466 m) above sea level, but when the river was dammed in 1900, the elevation was raised to 1,560 feet (475 m).

From the Cedar River Watershed, melting snow and rain are gathered and stored in the Chester Morse Lake and the Masonry Pool reservoirs created by the Masonry Dam. Masonry pool, immediately west of Chester Morse Lake, serves as an additional impoundment.


The Cedar River then flows downstream 12 miles to the Landsburg Diversion Dam (river mile 21.9) which was originally built in 1901. From the Cedar River Watershed, melting snow and rain drain to the Chester Morse Lake and the Masonry Pool reservoirs created by the Masonry Dam. In 1914 the City of Seattle began building a masonry dam on the Cedar River between Rattlesnake Lake and Chester Morse Lake. The dam diverts the water into two large penstocks which drop water 620 feet to the hydroelectric power plant at Cedar Falls, the birthplace of Seattle City Light. Due to unforeseen engineering issues, the following spring, the water started rising at Rattlesnake Lake below the dam at a rate of 1 foot per day and the lake above was dropping an inch per hour.


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