For the second time this month, ferry riders traveling between West Seattle and Vashon Island may experience long waits as a 52-year-old boat needs repairs sooner than previously thought.

The Seattle Times reports riders on other routes may feel the pinch, too, as Washington State Ferries deals with ongoing maintenance projects and a lack of backup boats.

Starting Monday, the Fauntleroy/Vashon/Southworth route, known as the Triangle Route, will operate on a two-boat schedule instead of the usual three-boat weekday schedule.

Riders on two other routes, Edmonds/Kingston and Seattle/Bremerton, may also experience delays as smaller-than-usual boats serve those routes.

Seattle/Bremerton riders should expect possible delays starting this weekend. That route and the Triangle Route could be back to normal by March 23 or sooner.

Delays on the Edmonds/Kingston route could last through the end of March.