(T-Rex) at Dinosaur Museum S. of Rapid City, Pennington County, SD. US16 S. (curves W.) 2.5 miles from jct with Catron Blvd on the S. side of Rapid City to the park on the W. side of the road at 8973. (N43 59.313 W103 16.358) Photos by Mark Comstock 7-21-24.