March 13, 2014
On Thursday, March 13, 2014, the President signed into law:
S. 23, the "Sleeping Bear Dunes National Lakeshore Conservation and Recreation Act," which designates approximately 32,557 acres of Federal land and inland water within the Sleeping Bear Dunes National Lakeshore in Michigan, as the Sleeping Bear Dunes Wilderness.
Barack Obama, Statement by the Press Secretary on S. 23 Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/310021