Prosser needs more caches so we are on a mission to make Prosser green! This is a two-part cache. Find the log at the coordinates and then find a treasure chest in the Prosser Historical Museum, Wednesdays to Saturdays, Hours: 1pm - 5pm. Just tell the museum director you are geocaching; she's in on it. Then, if you have time, wander around the museum, and learn a little about Prosser, the people and the animals. It's way awesome!