The closure at Kelly Mill Road will continue for another three weeks.
A 2.6-mile stretch of the corridor, from Bethelview Road to the city limits, has been shut to through traffic since mid-June to allow for improvement work.
It was scheduled to reopen to through traffic Aug. 5, but delays in relocating water lines have pushed that back to Aug. 26, said Tim Allen, Forsyth County’s assistant director of engineering.
A small section of Kelly Mill where it crosses Johnson Road will need to be shut down for about five days to lower the hillcrest, Allen said.
"At that point, the road will be totally closed to traffic at that segment and we will post a detour at Chamblee Gap [Road]," Allen said.
That closure had been expected to take place before the start of the 2011-12 school year Thursday. Instead, it likely will occur Aug. 15-19.
Forsyth County Schools’ transportation department has been notified of the roadwork, he said.
"It was our intent to do it during the summer while school was out," Allen said.
He said Cumming Utilities must move some water lines before the county can proceed with the work at Johnson.
Jon Heard, director of the municipal department, could not be reached for comment Tuesday.
After the closures, work along the road will continue under traffic.
The project’s final completion date of Nov. 20 is not expected to be affected by the current delay, Allen said.
Several improvements will be made to Kelly Mill during the project, including: adding left and right turn lanes at Chamblee Gap Road and straightening three curves.
In addition, the project will lower a hillcrest, widen travel lanes and shoulders and install guardrails.
All the improvements, especially the straightening of some sharp curves, will enhance safety on the road, Allen said.
The county has hired Blount Construction to complete the work at a cost of about $2.6 million, which will come from the current 1-cent sales tax revenue.
The Forsyth County Board of Education also agreed to reimburse the county for about $308,000 in work associated with construction of Kelly Mill Elementary School, which is expected to open next fall.
Commissioners also agreed to pay half of the cost of relocating city water lines, which is expected to total $220,000 between the two governments.