Directions to Cougar Hot Springs
From I-5 or Eugene/Springfield, travel east 45 miles on highway 126 (the
McKenzie Highway). 5 miles after Blue River, you'll pass
the mile post 45 sign. A half mile
later, see the sign for Cougar Reservoir and turn right on FS 19.
From Bend, travel west on highway 20. After 20 miles you will pass through Sisters. After the Santiam Pass, you will stay on highway 20 when highway 22 splits off. Soon after, turn left onto highway 126. After another 40-50 miles you will see the sign announcing McKenzie Bridge. 3 miles later, you'll see Harbick's Country Store on your left. This is the only gas between Sisters and Cougar. Continuing west from Harbick's, go another 2 miles until you see the signs pointing to Cougar Reservoir. Turn left on FS19. (see above for directions once on FS19).
On FS 19 you are entering the Willamette Forest. Turn right at the stop sign. After 4 miles, you will pass the dam on your left. Continue on FS 19. Another 4 miles later, on your right you will pass a trail head sign that says "Terwilliger Hot Springs," the waterfall and lagoon on your right and the parking lot on your left. Park there. Walk to the trailhead (100 yards) when you can pay at the kiosk there.
From the trailhead hike 1/4 mile into the Hot Springs located in the forest.
Terwilliger is the official name for Cougar Hot Springs.
Let me know how it goes. I hope you have a wonderful visit.