Jahn Reservoir   Be the first to submit input for Jahn Reservoir. If you have info on Jahn Reservoir, Coast Ranges, Polk County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Jahn Reservoir.   Lakes Near Jahn Reservoir: Mountain Springs Ranch Reservoir, Polk County, 11 miles away Corvallis Reservoir, Benton County, 14 miles away Valsetz Lake, Polk County, 16 miles away   Public Lands Near Jahn Reservoir: Sarah Helmick State Park, Oregon, 14 miles away Siuslaw National Forest, Oregon, 16 miles away Ellmaker State Park, Oregon, 16 miles away   Hotels Near Jahn Reservoir: Best Western Dallas Inn & Suites, Dallas, 10 miles away Harrison House Bed and Breakfast, Corvallis, 16 miles away Comfort Suites Corvallis, Corvallis, 17 miles away Best Western Grand Manor Inn, Corvallis, 17 miles away Days Inn Corvallis, Corvallis, 17 miles away   Whitewater Near Jahn Reservoir: Mill Creek, Polk/YamhillCounty, 9 miles away       Class I-II - 7 miles long (Buell County Park to Yamhill River) Mill Creek, PolkCounty, 10 miles away       Class III-IV - 5.6 miles long (Upper Bridge to Mill Creek County Park) Marys River, BentonCounty, 11 miles away       Class I-II - 10.5 miles long (Wren to Philomath)