Jack Post Reservoir   Be the first to submit input for Jack Post Reservoir. If you have info on Jack Post Reservoir, Natrona County, Wyoming please submit it here to improve this web site.          These outdoors activities are available near Jack Post Reservoir.   Public Lands Near Jack Post Reservoir: Independence Rock State Park, Wyoming, 38 miles away   Whitewater Near Jack Post Reservoir: Powder River - Middle Fork, Washakie JohnsonCounty, 19 miles away       Class II-V - 12 miles long (Forest Service Road bridge Close to county line to Highway 190)