Originating in California, the Lost River flows north into Oregon in Klamath County then ends up back in California at Tule Lake.
- Resident Rainbow Trout
At roughly 60 miles long, the Lost River is a complex series of dams, canals, pumps, and other artificial structures that regulate it's water. Historically, the Lost River was home to widespread and abundant populations of the Lost River Sucker, which was federally listed in 1988. This once wetland area for Lost River suckers provided an important food source for Native Americans and local settlers. Today, agricultural development and associated water and land use changes in the basin have contributed to a significant loss of wetland habitat and resulted in significant declines in sucker populations.