The Donald Dungan branch of Costa Mesa's library system will be closed April 1 through July 5, according to a city news release.
Construction crews will replace a structural beam at the library, 1855 Park Ave.
The Mesa Verde branch, 2969 Mesa Verde Drive East, will be open during the closure period.
The city also said the library's new Technology Branch, 2263 Fairview Road, Suite A, is scheduled to open April 18. That branch was previously on Bristol Street at Paularino Avenue.