Was intrigued so did a bit of looking as I'll be there later in the year.
Sidney/Anacortes ferry Terminal from Victoria.
The Sidney/Anacortes Terminal is located 18 miles north of downtown Victoria. There are two exits off Highway 17 Northbound to the Sidney/Anacortes Ferry Terminal: Amity Drive and Beacon Avenue. When taking the Amity Drive exit, turn left at Lochside Drive. After 2 miles turn right at Ocean Avenue. The ferry terminal entrance will be on the right. For the Beacon exit, take a right off the highway on to Beacon Ave and then turn right at Fifth Street. Turn left at Ocean Avenue, and the ferry terminal entrance is located on the right.
Ref: http://www.wsdot.wa.gov/ferries/vesselwatch/TerminalDetail.aspx?terminalid=19 over 6 years ago