Caltrans has closed the connector ramp from northbound U.S. Highway 101 to state Highway 1 near Tam Valley because of an unusually high tide.
The ramp is expected to reopen around 2 p.m., Caltrans spokesman Steve Williams said.
Motorists are advised to take the Marin City/Sausalito exit just south of the Hwy. 1 exit and to expect delays, he said.
--Bay City News Service