Lost Lake is a lake in Mount Hood National Forest. We have to identify it as the one in Hood River County because we have more than one Lost Lake here in Oregon.

The lake is bounded on the east by 4,468-foot (1,362 m) Lost Lake Butte and on the southwest by 4,556-foot (1,389 m) Preachers Peak. The lake is fed by three unnamed intermittent creeks from Lost Lake Butte, and Inlet Creek from Preachers Peak. The lake maintains a very consistent level via an outlet at the north tip, the source of Lake Branch Hood River, a tributary of West Fork Hood River. It is the second-deepest lake in Mount Hood National Forest after Wahtum Lake at 167 feet (51 m).