Garrigan's Landing is a public boat ramp on Lake Oahe in Sully County that provides access to the reservoir with a courtesy dock and fishing facilities.

This is a lightly-used access point, typically serving around 50 boats annually, making it a quieter alternative to heavily-trafficked ramps like Bush's Landing.

The ramp includes a dump station and is maintained by South Dakota Parks Division as part of the 39 boat ramps available around Lake Oahe's 2,250-mile shoreline.