Pierpont Lake is a 77-acre reservoir in northwestern Day County, South Dakota, created by Pierpont Dam on Mud Creek. The lake features 2.2 miles of shoreline and relatively shallow waters, with a maximum depth of 13 feet and a mean depth of 8 feet.

The lake's surrounding watershed consists primarily of cropland, and water flows westward via Mud Creek to the James River. The reservoir maintains a warm water fishery supporting northern pike, yellow perch, black bullhead, black crappie, green sunfish, and largemouth bass.

Physical characteristics of the lake include: - Surface area: 77 acres - Lake volume: 602 acre-feet - Shoreline length: 2.2 miles - Dam: 24-foot high earth dam built in 1937 by the WPA - Dam length: 560 feet

Basic camping facilities are available at Pierpont City Park. The lake is part of Pierpont Lake Recreation Area, though the site offers limited amenities for paddlers.

Average summer temperatures in the area reach highs of around 80°F in July, while winter temperatures frequently drop below freezing. June through August typically see the highest precipitation levels, with June being the wettest month. January is generally the driest month.

For paddlers considering a visit, note that this is a relatively small impoundment with modest depths. While the lake allows boating activities, it's recommended to check with local authorities about current access conditions and regulations before your trip.