Work begins to replace Hunter Mill Road bridge over Colvin Run

A rendering of the planned Hunter Mill Road bridge over Colvin Run with an inset photo of the existing bridge (via VDOT)

Construction is now underway on the project to replace the Hunter Mill Road bridge over Colvin Run, the Virginia Department of Transportation announced yesterday (Monday).

The bridge will remain open during construction, but flaggers will be present to direct traffic, and lanes may be closed on Hunter Mill Road during the following times:

  • Monday through Thursday: 9 a.m. to 3:30 p.m.
  • Monday night through Thursday night: 9 p.m. to 5 a.m.
  • Friday: 9 a.m. to 2 p.m.
  • Friday night: 10 p.m. to 9 a.m.
  • Saturday night: 9 p.m. to 9 a.m.
  • Sunday night: 10 p.m. to 5 a.m.

VDOT says the trail that crosses Hunter Mill Road south of the bridge may also be closed intermittently during construction.

“Drivers, cyclists and pedestrians are reminded to use caution when traveling in active work zones,” VDOT said in its news release. “Be alert to new traffic patterns, limit distractions and follow detour route signage.”

Approved by the Fairfax County Board of Supervisors on Dec. 1, the project is replacing the existing one-lane bridge with a two-lane bridge featuring a grass median or splitter island to separate the lanes.

It also entails improvements to the trail crossing, median landscaping, and abutments for a new trail bridge over Colvin Run that the county will build in the future.

The current bridge was built in 1974 and is limited to bearing 10 tons, even though an average of 8,500 vehicles use Hunter Mill Road in the project area every day, according to 2019 VDOT data.

The project carries an estimated cost of $5.2 million, including $1 million for engineering work and $4.2 million for the actual construction. The projected cost of construction has gone down, as VDOT estimated as recently as early July that it would cost $4.8 million.

The funding includes a $408,000 contribution from Fairfax County for pedestrian improvements south of the new bridge, including the construction of the splitter island and median refuge and the installation of rectangular rapid flashing beacons.

The rest of the funding comes from federal and state sources, primarily VDOT’s State of Good Repair program to help rehabilitate or replace bridges that are in poor condition.

Conducted by contractor Clearwater Construction Inc., construction is expected to be completed in the fall of 2022.

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