Fern Ridge Reservoir (or Fern Ridge Lake) is a reservoir on the Long Tom River in the U.S. state of Oregon. The reservoir is located approximately 12 miles (19 km) west of Eugene on Oregon Route 126. The reservoir is a U.S. Army Corps of Engineers flood control project encompassing more than 12,000 acres (49 km2) and is a popular site for boating, fishing, and birdwatching.
Surrounding portions of the reservoir is the Fern Ridge Wildlife Area, a wildlife management area providing a unique habitat for a variety of species including wintering waterfowl populations.
