The District Department of Transportation announced Saturday that it plans to close Chain Bridge on some weekends starting this month and continuing into December for repairs under the bridge deck.

DDOT said most of the repair project was finished in spring 2010. The rehabilitation got started in spring 2009. Drivers remember that well from the lengthy period of weekday lane closings and the full closings on some weekends.

The additional work, which kicks off Monday and is to continue through Dec. 23, does not include a schedule of weekday closings. But during the designated weekends, the Potomac River bridge will close at 8 p.m. Friday and reopen by 5 a.m. Monday.

These weekend closings will be complete shutdowns. There will be no access to the bridge from either the District or Arlington for drivers, cyclists and pedestrians. Canal Road will remain open, but drivers won’t be able to turn onto Chain Bridge.

The nearest alternative routes across the Potomac are the American Legion Bridge to the west and the Key, Roosevelt, Memorial and 14th Street bridges to the east.

The first such closing is set for next weekend, Aug. 19-21. Then the shutdowns will follow this schedule: Sept. 9-11, Sept. 16-18, Sept. 30-Oct. 2, Oct. 7-9, Oct. 21-23, Oct. 28-30, Nov. 18-20, Dec. 2-4 and Dec.16-18.