Deerfield Lake, located 20 miles west of Hill City in the Black Hills National Forest, offers 435 acres of protected waters with a strict no-wake restriction and 5 mph speed limit, making it ideal for paddling. The lake features clear water with visibility to the bottom in many areas and approximately 16 miles of shoreline.

Multiple access points serve the lake, including boat launches at both the north access (off Rochford Road near Custer Trail) and south access (on Deerfield Cove Road near Dutchman Campground). A $5 vehicle day use fee applies.

The lake is ringed by forest and rolling hills, with several coves and inlets to explore. Castle Creek feeds the reservoir, which maintains an average depth of 30 feet and reaches depths up to 85-90 feet near the dam. At 5,900 feet elevation, it holds the distinction of being South Dakota's highest elevated lake.

Three campgrounds provide overnight options: Custer Trail (16 first-come sites), Dutchman (44 reservable sites), and Whitetail (17 reservable sites). Two dedicated picnic areas, Lake Shore and Mountain City, offer additional amenities. The Deerfield Lake Loop Trail circles the water's edge.

Wildlife viewing opportunities include eagles, hawks, and various waterfowl. The lake supports populations of rainbow trout, brook trout, and splake (a brook trout/lake trout hybrid). The higher elevation typically provides cooler temperatures than surrounding areas during summer months.

Facilities include vault toilets at the campgrounds, but paddlers should note that drinking water availability is limited. The lake's peaceful character is preserved by the no-wake restriction, making it particularly appealing for canoes, kayaks, and stand-up paddleboards. Several rental operations in the area provide paddle craft and basic equipment.