Lake Herbert G. West (or Lake West) is a reservoir formed by the Lower Monumental Dam. It extends up the Snake River for 28 miles (45 km) to the tailwater of Little Goose Dam. It has a surface area of 6,590 acres (27 km²), a maximum storage capacity of 432,000 acre feet (533,000,000 m3), normally kept at 377,000 acre feet (465,000,000 m3).
As the reservoir filled in 1968, it flooded several archaeological sites, including the Marmes Rockshelter, which contained the oldest known artifacts in Washington, dating back over 10,000 years.
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