Thompson Northeast Public Boat Ramp is a concrete boat ramp (16 feet wide) located on Lake Thompson's northeast shore near De Smet, featuring paved access, a fish cleaning station, and maintained facilities managed by South Dakota Game, Fish, and Parks.

The ramp is considered one of the best access points on the lake and is popular with anglers launching motorized boats, sailboats, and canoes.

Note that the main ramp underwent replacement starting October 2, 2024, with alternative access available at the Lakeside Use Area on the northwest side during construction.