Casad Dam, Concrete arch dam in Kitsap County, United States

Casad Dam is a concrete arch dam on the Union River in Kitsap County, Washington, built from 1955 to 1957. It impounds a reservoir holding 1,400,000,000 US gallons (5,300,000 m3) that supplies over half of Bremerton's municipal water, fed by gravity from 607 feet (185 m) to the city near sea level.

Construction of Casad Dam began in 1955 and was completed in 1957, creating the reservoir that supplies over half of Bremerton's municipal water. The city draws this water by gravity from the reservoir at 607 feet (185 m) in the hills down to a city mostly at sea level.

This dam supplies drinking water to the nearby city and forms a key part of how the region manages its water resources. Residents depend on the steady flow it provides through gravity-fed channels to their homes.

The dam sits about four miles from the Seattle Fault, on the north side of Green Mountain, and its intake tower was retrofitted in 2012 to withstand a 0.78 g peak acceleration in a maximum credible earthquake. The reservoir is an open-air source that can occasionally be affected by algal blooms.

An intake tower on this dam received reinforcements in 2012 to protect against earthquake damage. This upgrade shows how older structures are adapted to meet current safety standards in seismic zones.