The Waldo Grade is a highway grade between the Golden Gate Bridge and Marin City on U.S. Route 101 in California. It is defined as the stretch of roadway between the Spencer Offramp and Marin City, within the city of Sausalito. This grade is traversed by a full freeway multi-lane highway facility. The highest elevation on this freeway section is at the Waldo Tunnel. This portion of U.S. Route 101 is an important link in surface transportation connecting the city of San Francisco to Marin County and the North Bay. Nearby locations to the Waldo Grade include: the city of Sausalito, the U.S.