A section of a road in a south Forsyth subdivision will close this week for repairs.

The primary outfall of Grand Avenue, which is in the Grand Cascades subdivision, will be replaced and a secondary spillway under the road will be rebuilt, Forsyth County officials said.

The public road is expected to reopen to traffic by Aug. 8, weather permitting.

The outfall, which is where water gets out of the lake in an upper dam, failed about two years ago and the county’s roads and bridges division did temporary repairs, said Tim Allen, assistant director of engineering.

“At that time, we noted that it was in poor condition and started getting moving toward getting a design to do a permanent replacement and repair of the spillway,” Allen said.

The replacement is expected to have a lifespan of 80 to 100 years.

To handle the work, the county hired the Dickerson Group, which will complete the project for about $271,000.

The project is funded by 1-cent sales tax collections under the traffic safety improvements category.

Since the road is a loop, Allen said drivers still can access all homes during the closure.