Traffic using the East Capitol Street bridge across the Anacostia River will be made one-way for a year, starting Monday, to permit reconstruction of the span, the D.C. Transportation Department announced yesterday.

Traffic on the bridge will be one-way westbound (toward downtown Washington) at all hours except during the weekday afternoon rush period. From 3:30 to 6:30 p.m. on weekdays, traffic will move eastbound.

Fromm 3 to 3:30 p.m. and from 6:30 to 7 p.m. on weekdays, the bridge will be closed to permit the moving of markers to guide motorists in reversing the flow of traffic.

During periods when only westbound traffic is permitted on the bridge, eastbound traffic will be rerouted to the Benning Road Bridge via 19th Street NE or to the Sousa Bridge via Pennsylvania Avenue SE.

During the afternoon rush, westbound trafic will be detoured off East Capitol Street to either of the two parallel bridges via Minnesota Avenue.

Metrobus routes T-10, T-11 and 40 will be detoured via the Bening Road bridge.

During the reconstruction period, three of the East Capitol Street bridge's six lanes will be kept open at all times.

The bridge, officially called the Whitney Young Memorial Bridge, now carries about 56,000 cars each weekday in both directions. It provides a major route between downtown, the Northeast, Southeast and central Prince George's County.