Omak Lake is a saline endorheic lake in the U.S. state of Washington. The lake, the terminus for water flowing in from several creeks, covers 3,244 acres (13.13 km2) at an elevation of 950 feet (290 m). Its volume of 705,000 acre feet (869,265,000 cubic meters) and depth of 325 feet (99 m) is the largest saline lake in Washington.[2]