The Olsen Creek Trail system, which is above Lake Whatcom, adds more areas for hiking, mountain biking, and horseback riding. It’s currently accessible through the county’s Y Road Trailhead.

Its first 0.6 mile is shared hiking and biking. The remaining 4.4. miles of trail is open to two-way foot traffic and uphill-only bike travel. Bikes return to the trailhead via a logging road.