Triangle Lake is an unincorporated community in Lane County, Oregon, United States.

[1] It is about 25 miles (40 km) west of Junction City on Oregon Route 36, on the southwest side of the lake of same name.

[4] Before Fern Ridge Reservoir was completed in 1941, the lake was the most popular local spot for water sports.

[4] Amenities at Triangle Lake County Park include two picnic tables, a boat dock, and toilets.

[5] Fish species in the lake, which reaches a depth of 90 feet (27 m), include largemouth bass, Northern pike minnow, shad, bluegill, yellow perch, brown bullhead, kokanee, and cutthroat trout.