Terwilliger (Cougar) Hot Springs

What to expect

Terwilliger Hot Springs, also called Cougar Hot Springs after the reservoir below it, is one of the most visited natural springs in Oregon. It sits in a steep side ravine on Rider Creek, just west of Cougar Reservoir in the Willamette National Forest, about a quarter mile from the road.

The water comes out of the hillside above the top pool and runs down through four soaking pools separated by rock walls, laid out like steps. The top pool is the hottest, around 112°F44°C according to the Forest Service, and each pool below is cooler, down to about 85°F29°C in the lowest one. The pools range from about 3 to 12 feet across and are mostly 2 to 3 feet deep. The floors are largely bedrock, with some gravel and sand. Volunteers rebuilt the pool walls in 2009.

This is a managed site, not a backcountry soak. There is an information kiosk, a clothing rack, trash cans, composting restrooms near the pools and vault toilets at the parking lot. Since 2026, on-site hosts at the entrance help with parking, payment and the capacity limit. Even with all that, the setting is still a mossy, steep ravine under tall conifers. The 2018 Terwilliger Fire burned the area, and you will still see fire-killed trees on the slopes.

Getting there

The springs are on Forest Road 19, the Aufderheide Scenic Byway, which links Highway 126 near Blue River with Highway 58 near Westfir.

• From Highway 126 (the usual route from Eugene): Drive about 4 miles east of Blue River and turn south onto Forest Road 19. Keep right at the Y to cross the top of Cougar Dam, then follow the road south along the reservoir for about 5 miles to the signed Terwilliger Hot Springs parking lot.
• From Highway 58: Take Westfir Road, across from the Middle Fork Ranger Station, and turn left at the stop sign. Pass the red covered bridge, where the road becomes Forest Road 19, and drive about 50 miles north to the lot. This is a slow, winding mountain road.

The lot was expanded in 2026 to hold roughly twice as many cars, but it still fills on busy days. Do not double park and do not park along Forest Road 19. RVs, buses and vehicles with trailers should use the pullout near Forest Road 1985/1986 or the Cougar Crossing Day Use Area.

From the lot, the Rider Creek Trail (#3319) runs about a quarter mile to the pools. It is short but uneven, with roots, rocks and wet patches. Wear real shoes.

Forest Road 19 is not cleared of snow or ice in winter. Construction can also close it: in April 2026 the road was shut for a month for bridge work between Rainbow and Westfir, and it reopened to two-way traffic in early May.

When to go

The site is open year-round, but its popularity drives everything. On summer weekends you can expect a wait at the entrance once the 65-person limit is reached.

Weekday mornings are the best bet for space in the upper pools. The newer closing time of 10pm makes evening soaks possible, but evenings are also busy.

Fall and spring bring cooler air that makes the hot upper pools more pleasant. Watch for rain, which makes the trail slick and raises the risk of debris coming down the ravine.

Winter soaks are quieter, but check road conditions first. Forest Road 19 can be icy, and the Forest Service warns that conditions change fast.

Rules and etiquette

The Willamette National Forest runs this site under a specific forest order (No. 06-18-01-26-03, in effect from March 15, 2026 through March 14, 2028). Violations can bring fines of up to $5,000. The main rules:

• Pay the fee: $12 per person for two hours, ages 12 and older. Payment is on site. No federal or forest passes are honored.
• Two-hour limit and a 65-person cap. Access is first come, first served.
• Hours: sunrise to 10pm. Being at the springs between 10pm and sunrise is prohibited.
• No alcohol. Possessing or drinking alcohol in the site area is banned.
• Clothing optional at the pools, but no nudity visible from Forest Road 19.
• No pets, including on the trail. Service animals must be leashed.
• No camping. The springs are day use only, and dispersed camping is banned across the Cougar Recreation Area.
• Park only in marked spaces. Parking against posted restrictions is a violation of the order.

Beyond the written rules, the usual hot spring manners apply. No soap or shampoo in the pools, no glass, and give up a spot in the top pool if people are waiting.

Where to stay nearby

Camping in the Cougar Recreation Area is limited to developed campgrounds. A forest order in effect until February 2027 bans dispersed camping in a half-mile strip on both sides of Forest Road 19 from Highway 126 down to Forest Road 1927, plus the areas around the reservoir and the springs.

The developed campgrounds closest to the springs, as listed by the Forest Service, are:

• Cougar Crossing Campground, near the south end of the reservoir.
• Slide Creek Campground, on the east side of the reservoir.
• Sunnyside Campground, also on the reservoir.
• French Pete Campground, a little farther south on Forest Road 19 along the South Fork McKenzie River.

Delta Campground sits near the junction of Forest Road 19 and Highway 126. For a bed, look in the McKenzie River corridor towns such as Blue River and McKenzie Bridge, or go back to Eugene and Springfield for the most choice.

Safety notes

• Fire-damaged slopes: the Forest Service says hazard trees near the pools have been dealt with, but loose rocks, flooding, debris flows and weakened trees can still fall in the ravine. Avoid lingering under dead trees, especially in wind or heavy rain.
• Heat: the top pool runs around 112°F44°C. Test it with your hand, keep soaks short and move down a pool if you feel dizzy. Do not put your head underwater.
• Footing: the trail and the rock walls between pools get slippery. Most injuries at hot springs come from falls, not the water.
• Winter driving: Forest Road 19 is not plowed or sanded. Carry chains and check conditions with the McKenzie River Ranger Station at (541) 822-3381.
• Security: busy trailheads attract car break-ins. Leave nothing on the seats.

History

Hiram Terwilliger came to the area in the 1860s and promoted the spring water for health, after first filing a mining claim; the Forest Service turned down his bid for mineral rights. Use grew after the roads were paved in the 1960s, and problems in the 1990s led to the day-use fee, the alcohol ban and limits on overnight use. The 2018 Terwilliger Fire closed the site until July 2019, and it reopened again in 2026 after a bridge restoration project.