Cougar Reservoir Hot Springs
Cougar Reservoir Hot Springs, widely known as Terwilliger Hot Springs, flows at 111 degrees Fahrenheit with roadside access requiring just 80 feet from Aufderheide Drive. The spring has been developed into five terraced pools fed by Rider Creek waterfall, creating one of Oregon's most popular soaking destinations on federally managed national forest land at 1,745 feet elevation.
The springs emerge on a forested slope in the Willamette National Forest, draining into Rider Creek before reaching Cougar Reservoir. At 1,745 feet elevation, the site sits in dense Douglas fir and western hemlock forest receiving 66.6 inches of annual precipitation and 130.3 inches of snow. The Cascade Range's western slope creates lush conditions with moss-draped trees and abundant undergrowth. The McKenzie River watershed encompasses the area, with volcanic formations underlying the soil. Aufderheide Memorial Drive provides scenic access through old-growth corridors.
The springs gained the Terwilliger name from a local family, while Cougar Hot Springs reflects the nearby reservoir. Indigenous peoples likely used the thermal waters for bathing and ceremonial purposes. Modern development occurred in the 1970s-1980s when volunteers constructed rock-and-cement pools in a terraced arrangement. The Forest Service now manages the site with a day-use fee system implemented to control crowding.
Visit midweek October through April to avoid summer crowds that can exceed 100 people on weekends. A Northwest Forest Pass or day-use fee is required. The site maintains clothing-optional tradition, so be prepared for that culture. Winter access requires navigating snow-covered roads and potentially hiking the final stretch. Slide Creek Campground sits 1.1 kilometers away. The high precipitation means rain gear proves essential most of the year, and the 111-degree pools provide welcome warmth in wet conditions.
Is Cougar Reservoir Hot Springs worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
Overview Slide Creek Campground is a unique camping destination just 50 miles from Eugene, Oregon. Located on the east bank of the Cougar Reservoir, it is known for handy access to boating and many water activities. It is also near Terwilliger Hot Springs, a pristine area with 5 soaking pools fed by the Rider Creek waterfall.Recreation Activities on the reservoir include water skiing, swimming, fishing and canoeing. Anglers might catch some quality rainbow trout. The campground is clos...