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Quick FactsOverview
About Terwilliger Hot Springs
Terwilliger Hot Springs, Oregon, also known as Cougar Hot Springs, is a series of four cascading soaking pools in the Willamette National Forest, 53 miles east of Eugene along the Aufderheide Scenic Byway near Cougar Reservoir. The pools are reached by a 0.4-mile hike from the trailhead and require a per-person day-use fee. Clothing is optional at the springs, which are among the most visited natural hot springs in Oregon, with a capacity limit of 15 people at the pools at any one time.
The pools are built from river stones set into a hillside ravine and cascade downward so that each successive pool is cooler than the one above. The uppermost pool runs at approximately 112 degrees Fahrenheit, while the lowest sits around 85 degrees Fahrenheit. Pool floors are exposed bedrock and gravel, and each pool is roughly 2 to 3 feet deep. Rider Creek flows nearby and a small lagoon and waterfall add to the forested setting.
The springs were used as a mineral water bathing site from the 1860s and formally managed by the Forest Service from the 1980s. The pools were renovated in 2009 using natural stone mortar. The area was significantly impacted by the 2018 Terwilliger Fire, which damaged the trail and surrounding forest. The site reopened in 2019, though some fire-related hazards persist.
Location & Access
Getting to Terwilliger Hot Springs
Terwilliger Hot Springs is reached from the trailhead on Aufderheide Scenic Byway, Forest Road 19, approximately 5 miles south of the Cougar Reservoir dam. From Blue River, drive east on Highway 126 for 4 miles, then turn right onto Cougar Dam Road and follow it 0.4 miles before turning right onto Aufderheide Drive. Continue south for 5 miles to the signed parking area on the left. Note that since a 2017 landslide closed the northern approach, visitors must approach from the Highway 126 side and travel south on Aufderheide Drive, adding 30 to 40 minutes compared to older directions. The trailhead address is Aufderheide Drive, Blue River, Oregon 97413.
From the parking area, hike 0.4 miles west on the Rider Creek Trail to the springs, passing a dog tie-up area and vault toilets just before the pools. The hike is mostly flat and takes about 10 to 15 minutes. For visitors looking for hot springs near Eugene, Terwilliger is the closest accessible soaking site, roughly an hour and a half drive east of the city. A per-person day-use fee is charged at the trailhead. The site is open year-round, but Forest Road 19 is not maintained for snow and ice in winter, so road conditions should be checked before visiting in cold months.
Suitability & Accessibility
Who Terwilliger Hot Springs Suits
Terwilliger Hot Springs suits adults and older teenagers who are comfortable with a clothing-optional environment and a natural, minimally developed setting. The short hike and flat trail make physical access easy for most visitors, though pool floors are rocky uneven bedrock, which can make moving between pools awkward. Families with young children should be aware that clothing is optional throughout the soaking area and that the upper pools reach temperatures that may be too hot for small children.
For those seeking natural hot springs in Oregon with a well-maintained forest setting and clear water, Terwilliger stands out among western Oregon springs. The Forest Service enforces a 15-person capacity limit at the pools, a 2-hour soaking limit during busy periods, and a Thursday morning closure for cleaning, which tends to produce the cleanest conditions shortly after reopening. Arriving early on weekdays gives the best chance of avoiding crowds at this consistently popular site.
Pets are not permitted at the hot springs or on the trail beyond the dog tie-up area. Cameras and photography are discouraged due to the clothing-optional policy, and visitors should get explicit consent of others before taking any photos. Alcohol and glass containers are prohibited. Wheelchair access is not possible, as the trail and pools involve uneven rocky terrain. Parking is limited and fills quickly on weekends, particularly in summer.
Safety & Etiquette
Safety and Etiquette at Terwilliger Hot Springs
Terwilliger Hot Springs requires mindful behavior, as the upper pools can reach temperatures of up to 112 degrees Fahrenheit. Always test the water before entering and move to a cooler pool if you feel lightheaded or overheated. The rocks between pools are wet and slippery, and falls are a real risk when moving around the site. The US Forest Service notes that post-fire hazards from the 2018 Terwilliger Fire persist in the area, including loose rocks, potential flooding, debris flows, and weakened trees that could fall without warning.
The Forest Service enforces specific conduct rules. The pools are day-use only, open from sunrise to sunset, and closed Thursday mornings from 8am to noon for cleaning. No nudity is permitted in view of Aufderheide Scenic Byway. Alcohol and glass containers are prohibited. Visitors should limit soaking time to 2 hours when others are waiting, and the capacity is capped at 15 people. Rangers patrol the site and can issue citations for violations.
Photography of other visitors requires explicit permission, particularly important given the clothing-optional policy. Theft from vehicles has historically been an issue at the trailhead. Valuables should be left at home or locked out of sight. Dogs must remain leashed at the designated tie-up area before the pools and are not permitted at the springs themselves.
Leave No Trace principles apply throughout. Pack out all waste, stay on designated trails, and do not disturb the surrounding forest still recovering from fire damage. Volunteers clean the springs weekly, and visitors should avoid introducing soap or personal care products into the pools to protect both water quality and the natural stone pool walls.
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