The Virginia Department of Transportation (VDOT) project team is set to begin its presentation at 7 p.m., and team members will be available to answer questions after the presentation of the proposal until 8:30 p.m.
The proposed plan for the bridge – which was built in 1974 – has construction beginning in spring 2021.
Under the plan, the new bridge will replace the one-way, 16-foot-wide lane with a two-way crossing with 11-foot lanes. Plans also include a three-foot-wide grass median.
Additional items within the project include an improved trail crossing south of the bridge and abutments for a new trail bridge over Colvin Run that the county will construct at a later date.
The proposed plan for construction will maintain the existing traffic operation while the new bridge is built. During the first phase of the plan, one lane of the new bridge will be built to the east of the existing bridge. The subsequent phases will shift traffic to the newly constructed bridge while the existing bridge is demolished before the second lane of the new bridge and the median are built.
An inspection of the bridge – which carries an estimated 8,500 vehicles a day – conducted by VDOT in February deemed its condition to be deteriorating rapidly. The condition rating for the substructure of the bridge is currently a three – the condition rating scale is based from zero to nine – which is considered to be in serious condition. The superstructure for the bridge shows significant corrosion of steel girder webs and flanges.
The bridge was strengthened on a temporary basis on Feb. 28 with additional wooden beams added between the bridge’s I-beams. While the load rating of the bridge was reduced from 19 tons to 10, the width of the bridge was also reduced from a 16-foot-wide lane to 10 feet.
Previous improvements to the bridge were made in 2012 and 2016 to maintain the integrity of the structure.
While initial costs were estimated at $3 million in February 2019, the proposed plan is anticipated to cost $5.1 million. The project will be financed with state funding through the State of Good Repair program that will cover $4.7 million of the project, while Fairfax County funding is estimated at $408,000, according to VDOT’s project update in May.
Interested persons may register for the virtual meeting at virginiadot.org/huntermillcolvinrun. Anyone wishing to participate offline, without registering, may call 877-309-2074 (use access code 635-767-879) to listen in.
Any comments following the meeting on Wednesday regarding VDOT’s plan for this project must be submitted by Sept. 28, 2020, on the project website, or by mail to Mr. Vicente Valeza, P.E., Virginia Department of Transportation, 4975 Alliance Drive, Fairfax, VA 22030, or by emailing [email protected] Emails should reference “Hunter Mill Road over Colvin Run Bridge Replacement” in the subject line.
Photos courtesy VDOT