About Knox
Knox is a refreshing cold spring nestled near Warm Lake in Idaho, offering a series of wide, inviting pools fed by crystal-clear waters. This primitive spring features sandy bottoms and patches of grass perfect for picnicking, creating a serene swimming hole experience amid nature's tranquility. Knox stands out among Idaho swimming holes for its mix of open water and peaceful surroundings.
Getting There
To reach Knox from McCall, take Highway 55 south to Cascade, then turn left onto Warm Lake Road (Forest Road 22). Just before Warm Lake, turn left onto a narrow paved road that runs along the South Fork of the Salmon River; parking is limited and right at the trailhead. A short 5-minute walk up an embankment and across a wooden fence brings you into the meadow and down to the spring pools.
What to Expect
The water at Knox is crisp and cold, perfect for cooling off on warm summer days. The atmosphere is calm and quiet, with few visitors passing through, making it an ideal spot for peaceful dips and picnics. Facilities are minimal—expect a primitive environment with no amenities, emphasizing a back-to-basics nature experience.
Tips for Visitors
Visit during the summer when the weather invites long swims and sun-filled afternoons. Bring water, snacks, and anything needed for a picnic, along with sturdy shoes for the short walk from parking. Prepare for limited parking and carry out any trash, as there are no services or fees posted. Respect the natural setting and private property boundaries at Knox Ranch.