Otter Creek Reservoir, Reservoir in Piute County, Utah, United States

Otter Creek Reservoir is a reservoir in southeastern Piute County, Utah, at about 1,940 m elevation, covering roughly 11 square kilometres. It lies in the southern end of Grass Valley, with Andy Canyon and Pole Canyon nearby, and the nearest town is Antimony, 19 to 24 km away. The reservoir stretches about 9.4 km north to south and 5.2 km east to west.

The dam was built in 1897 by Mormon farmers to irrigate their crops and is one of Utah's oldest dams. The state park on the southern shore was established in 1965 and has become a popular recreation destination.

The reservoir lies west of Antimony and is accessed via a dirt road, with the state park offering better parking and developed amenities. Visitors should note that primitive camping areas lack running water, so bringing your own drinking water is necessary.

Otter Creek Reservoir sits at about 1,940 m in the southern end of Grass Valley, and the nearest town is Antimony, roughly 19 to 24 km away. The reservoir covers about 11 square kilometres and stretches some 9.4 km north to south and 5.2 km east to west. Andy Canyon and Pole Canyon are the two side valleys on its shores.