A small section of Showground Road, Gosford, will be reduced to single-lane traffic from 8:30pm tonight while Council undertakes essential repairs to a water main.

The northbound lane of Showground Road adjacent to Gosford High School, at the intersection with Racecourse Road, will be closed from the roundabout.

Traffic controllers will be on site and traffic diversions will be in place.

Council urges motorists to take an alternate route to avoid traffic congestion expected at this intersection.

The road is expected to reopen by 6pm Saturday 18 November 2017.

Council apologises for any inconvenience.