where is potholes reservoir
At A Glance. We are located on the sunny shores of Potholes Reservoir located in Central Washington about 16 miles SW of Moses Lake, I-90 Exit 179. Potholes Reservoir is a 28,000 acre man-made lake contained by OâSullivan Dam, which is the longest earthen filled dam in the United States.t A Glance. We are located on the sunny shores of Potholes Reservoir located in Central Washington about 16 miles SW of Moses Lake, I-90 Exit 179. Potholes Reservoir is a 28,000 acre man-made lake contained by OâSullivan Dam, which is the longest earthen filled dam in the United States.