Drivers detouring around Maple Street in Hopkinton for the last three months can return to their old routines.
The stretch of Route 127 that runs east of the Rowell Covered Bridge has reopened, according to the state Department of Transportation.
The road was closed for about 11 weeks beginning Aug. 27, while a hydropower dam on the Contoocook River was upgraded.
The penstock, a tunnel beneath the road that carries water from the river and turns generators in a small power plant near the dam, was dug up and replaced. Final paving and striping was completed this week, DOT spokesman Bill Boynton said.
The 1-megawatt plant is owned by Vermont-based Green Mountain Power, which also owns dams in Manchester, Rollinsford, Somersworth, Claremont, West Lebanon and Woodsville. The dam is owned and operated by the U.S. Army Corps of Engineers.