ANTIOCH -- A major city thoroughfare will be closed all day Saturday as work is being completed on a bridge that crosses over Highway 4.

G Street will be closed from Minta Lane to Texas Street from 7 a.m. to 9 p.m. Saturday as contractor will be completing a bridge over the freeway, according to a Contra Costa Transportation Authority news release.

Traffic will be detoured to A Street and Contra Loma Boulevard.

The final lane configuration on the G Street bridge will consists of one northbound lane, two southbound lanes, road shoulders that are five feet wide and sidewalks with a width of 10 feet on each side of the road.

For more information on Highway 4 closures, visit http://4eastcounty.org.

Contact Paul Burgarino at 925-779-7164. Follow him at Twitter.com/paulburgarino.