CLAY JENKINSON, A HISTORIAN, AUTHOR and scholar with a heartfelt interest in the American West, will make a one-of-a-kind appearance at the Salida Steamplant Event Center June 25 as the incomparable John Wesley Powell. Well known for his various books and documentaries, Jenkinson is also a one-person interpreter of various historical figures. He shared that he comes to explore Salida and hopes that Salida will explore him. “I never bullshit — I try to talk about things that matter through whatever lens I happen to be looking through.” He will quite literally tie one arm behind his back, don a…