A portion of Bank Road will close for three weeks beginning next week.

The 9200 block of Bank Road, which is near where the road meets Beall Road, will close for construction from Tuesday, Feb. 21, to Monday, March 12.

Jim Didricksen, a Vashon-based supervisor with the King County Roads Division, said the road is closing so that crews can replace an aging culvert. The culvert, an old-fashioned cement and rock arch, is beginning to fail, Didricksen said.

“The road has been sinking there because of that,” he said.

The Roads Division will create a detour for drivers to follow during that time.