Amsden Lake is a 235-acre reservoir in Day County, South Dakota, created by a WPA-constructed dam in 1936. The lake features a public access area with a boat ramp, beach, and primitive camping facilities managed by South Dakota Game, Fish and Parks. Kayaking, canoeing, and paddleboarding are permitted activities at the lake.

The lake has 5.9 miles of shoreline and reaches a maximum depth of 27 feet in an old gravel pit area. The average depth is 9 feet. The shoreline remains largely undeveloped except for the small park area, providing a natural setting for paddling. The lake is fed by Mud Creek, which eventually flows into the James River.

Essential facilities for paddlers include a boat ramp, primitive campsites (11 non-electrical sites), picnic tables, vault toilets (open year-round), and a swim beach. Note that there is no water available at the park.

Safety considerations are significant due to the submerged gravel pit creating sudden depth changes. The lake has historically experienced tragic accidents related to these underwater hazards, so paddlers should maintain awareness of their location on the water.

Wildlife viewing opportunities include deer, various bird species, and occasional bald eagle sightings. The surrounding landscape features native rangeland along the west slope of the Prairie Coteau and the Crandall-Crocker Hills, where wind turbines dot the horizon.

To access the lake from Groton, travel 6 miles east on US-12, then south on 412th Ave for 5 miles. Turn east on 423rd for one mile, then north on 413th Ave to reach the lake access area. The park is managed through Richmond Lake Recreation Area (605.626.3488).