(Keystone Wye, 290', 1968, renovated 2022) across US16 E. of Hill City, Mt. Rushmore Township, Pennington County, SD. US16 NE (curves SE then E.) 8.6 miles from from jct with Major Lake Dr. on the NE side of Hill City to the bridge overhead. (N43 55.485 W103 26.564) Photo by Mark Comstock 7-21-24.

Photo by Howard Hatschek 8-13-12.