Forest Road 4100-126 is a hiking, biking, and horse trail in Kittitas County, Washington. It is within Okanogan-Wenatchee National Forest. It is 1.8 miles long and begins at 3,817 feet altitude. Traveling the entire trail is 3.6 miles with a total elevation gain of 795 feet. The trail ends near the WQFY429 microwave transmit / WQOT523 receiver communication tower. There is also a tower near the end of the trail.