United States, Arizona, Coconino, Coconino National Forest, Flagstaff W Quad., Iris Tank, 0.6 mi N of junction of USFS Rd 506 at end of unmarked USFS rd. 1.1 mi N of junction of I-40 (Riordan Exit #190) and USFS Rd 518. ca 2 mi S of A-1 Mountain ca 4 mi W of Flagstaff.