Jordanelle Reservoir
Looking southwest across the Jordanelle Reservoir, with Mount Timpanogos in the distance and the US-40/US-189 road cut on the right, June 2006
Jordanelle Reservoir Show map of Utah Jordanelle Reservoir Show map of the United States
Location	Wasatch County, Utah United States
Coordinates	40°37′0″N 111°24′30″W / 40.61667°N 111.40833°W / 40.61667; -111.40833
Type	reservoir
Primary inflows	Provo River
Primary outflows	Provo River
Basin countries	United States
Surface elevation	6,188 feet (1,886 m)[1]
Settlements	Hideout

Jordanelle Reservoir is a reservoir in Wasatch County, Utah, United States,^[1] just north of Heber City.

Jordanelle Reservoir is fed and drained primarily by the Provo River, and is impounded by the Jordanelle Dam, an earthen dam. The construction of the dam resulted in the reroutings of both U.S. Route 40 and U.S. Route 189 (which now run concurrently over the summit of nearby mountains) and the submergence of the towns of Keetley, Hailstone, and Jordanelle.^[2]

Jordanelle State Park

Construction of the dam started on June 27, 1987, and was completed on April 12, 1993. Jordanelle State Park opened on June 29, 1995.^[3] Construction of the dam was challenged by several groups. Conservationists wanted to maintain the natural state of the Provo River. Because of this, a large area at the foot of the dam was converted into an artificial wetland.^[4] Other groups were concerned that the site was geologically flawed, citing the catastrophic failure of the Teton Dam in Idaho in 1976. Mining interests in nearby Park City were also concerned, fearing that the reservoir would flood sections of the Ontario silver mine.^[2]

During the summer months, Jordanelle is a destination for triathletes and runners alike. Because of the State Park's rugged terrain on the Rock Cliff side, sponsors^[who?] host sprint triathlons in addition to 10-kilometre (6.2 mi) races and ultra marathons.