Washington State Ferries is reminding travelers to plan for busy ferry routes over the Thanksgiving holiday weekend.

Four routes — including the Clinton-Mukilteo route — will be on a holiday schedule on Thanksgiving Day. The other routes on the holiday schedule are Edmonds-Kingston, Seattle-Bainbridge and Point Defiance-Tahlequah. Also, there is no passenger-only service between Seattle and Vashon Island on Thursday.

The Keystone-Port Townsend route will follow its regular weekday schedule, but reservations are strongly recommended. Visit www.wsdot.wa.gov/ferries or call 1-888-808-7977 or 5-1-1 to make a reservation.

All ferry routes will operate on a regular weekday schedule on Friday, Nov. 28. Travelers should expect longer lines throughout the holiday weekend, state transportation officials said, and are encouraged to arrive early. The longest backups are expected to occur westbound on Wednesday afternoon and evening, Nov. 26, and eastbound on Friday morning, Nov. 28.

For more ferry system information, visit www.wsdot.wa.gov/ferries. To sign up for free e-mail alerts about service disruptions and other route information, click on the link in the far left column of the Web site.