Chester Morse Lake is a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the upper region of the Cedar River

Cedar River (Washington)

The Cedar River is a river in the U.S. state of Washington. About long, it originates in the Cascade Range and flows generally west and northwest, emptying into the southern end of Lake Washington...

 watershed in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 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). Chester Morse Lake is more than four miles (6 km) long, and is primarily fed from the east by the north and south forks of the Cedar River

Cedar River (Washington)

The Cedar River is a river in the U.S. state of Washington. About long, it originates in the Cascade Range and flows generally west and northwest, emptying into the southern end of Lake Washington...

, and from the south by the Rex River

Rex River

The Rex River is a river in the U.S. state of Washington. It originates near the crest of the Cascade Mountains and flows northwest to join the Cedar River in the Chester Morse Lake reservoir. The Cedar River flows to Lake Washington and, ultimately, Puget Sound...

. The lake is part of the Seattle area water supply. Fishing is prohibited.