The responses were rather interesting with a near split between Pine and Willow Creek. Yes, it is Pine Creek, taken on June 9, 2017 at the bridge on County Road A-1. Prior to the Brockman Flat Law flow of some 125,000 years, Pine and Willow Creeks were one. A portion of this lava flow extends to the east side of the lake near Bly Tunnel. It created a natural dam, and thus Pine Creek began to flood the area known today as Eagle Lake.
Support
I have read that it was black mt that caused the damming.