BART passengers taking bus bridge at Concord, Pleasant Hill stations

A train stops on the platform at the Pleasant Hill BART Station as the Avalon Walnut Creek Apartments, part of the Contra Costa Centre, are seen in the background, in Walnut Creek, CA, on Friday March 2, 2018. less A train stops on the platform at the Pleasant Hill BART Station as the Avalon Walnut Creek Apartments, part of the Contra Costa Centre, are seen in the background, in Walnut Creek, CA, on Friday March 2, ... more Photo: Michael Short / Special To The Chronicle Buy photo Photo: Michael Short / Special To The Chronicle Image 1 of / 1 Caption Close BART passengers taking bus bridge at Concord, Pleasant Hill stations 1 / 1 Back to Gallery

BART trains will not run through Pleasant Hill and Concord stations over Memorial Day weekend to allow for various track and maintenance projects, according to BART officials. The trains will be replaced by County Connection buses.

From Saturday through Monday, commuters traveling through Pleasant Hill or Concord stations will be required to leave the train and board a bus in their direction of travel. BART officials said customers traveling in this area should allow for an extra 20 minutes of commuting time.

BART officials suggested that passengers traveling toward San Francisco who typically park at the Concord, North Concord or Pittsburg/Bay Point stations may choose to drive to the Pleasant Hill station and park for free to avoid the bus bridge.

In a statement, BART officials said the closures are necessary to complete maintenance work. The projects are paid for by voter-approved Measure RR funds. They include replacing electrical and train control equipment, a drainage system, replacing and resurfacing rails, and removing and trimming trees that interfere with train operations.

“After this brief service change, customers will experience a smoother, safer and more reliable ride through the area,” the statement said.

Megan Cassidy is a San Francisco Chronicle staff writer. Email: megan.cassidy@sfchronicle.com Twitter: @meganrcassidy