O'Brien Reservoir   Be the first to submit input for O'Brien Reservoir. If you have info on O'Brien Reservoir, Natrona County, Wyoming please submit it here to improve this web site.          These outdoors activities are available near O'Brien Reservoir.   Public Lands Near O'Brien Reservoir: Edness K. Wilkins State Park, Wyoming, 28 miles away Seminoe State Park, Wyoming, 35 miles away   Marinas On or Near O'Brien Reservoir: Alcova Lakeside Marina, Alcova, 12 miles away   Hotels Near O'Brien Reservoir: Super 8 Casper/West, Casper, 15 miles away Hampton Inn Suites Casper, Casper, 18 miles away CASPER HILTON GARDEN INN, Casper, 18 miles away Best Western Ramkota Hotel, Casper, 18 miles away Quality Inn & Suites, Casper, 18 miles away   Whitewater Near O'Brien Reservoir: Whitewater Outfitter - Platte River Raft'n Reel, NatronaCounty, 13 miles away       Whitewater outfitter