This is St. Brendan Mission Church in Jeffrey City, Wyoming. The Church is served by Holy Rosary Church in Lander Wyoming.
This is one of those photos here that isn't particularly good, as light conditions were completely wrong for the photo when I took it. However, as I take these when the opportunity presents itself, I went ahead and photographed the church. If I have the chance, I'll swap it out for a better photograph at some later date.
This small church appears to have been converted from a building used for some other purpose originally in small Jeffrey City.