This project provides for the replacement of the existing Glen Road Bridge over Sandy Branch in Potomac. The existing bridge, built in 1930 and repaired in 1992, is a 12' single-span concrete slab structure with concrete abutments and wingwalls. The bridge provides a 21'-7" wide clear roadway. The proposed replacement bridge includes a two-cell 10'x10' box culvert carrying an 18'-0" roadway and a 2'-0" shoulder on each side. The project includes approach roadway work at each end of the bridge to tie into the existing roadway. The project also includes 360' of stream restoration. The area of stream restoration on the upstream side is increased, thus increasing the limit of disturbance of the project. The bridge and road will be closed to traffic during construction. Accelerated bridge construction techniques will be utilized to minimize the disruption to the public and local community.

The roadway Average Daily Traffic (ADT) is approximately 3,846 vehicles.

Design is expected to be completed in FY26. Construction is scheduled to begin in FY26 and complete in FY27. Foundation Characterization Program (FCP) review identified a Forest Conservation Easement within the project's Technical Concept Experiment (TCE), requiring approval from both affected property owners and execution of an Municipal Master Agreement (MMA) by MCDOT, M-NCPPC, and both owners. Only one owner has signed to date; the outstanding signature is delaying FCP approval and the Mandatory Referral.

The proposed replacement work is necessary to provide a safe roadway condition for the public. The 2015 bridge inspection report for Bridge No. M-0148X01 indicates that there are concrete spalls on the north fascia, and at the northeast corner of the soffit. There is a 6" diameter x 2" deep spall with exposed reinforcement adjacent to the west abutment. There is a 3'-0" long hairline crack with minor spalling up to 2" high and delamination in the northwest wing wall interface with the north fascia. There is a 2.5" deep spall and full height vertical fracture in the southeast wing wall interface with the east abutment. The bridge is currently posted for a 26,000 lbs. limit for a single-unit truck and a 26,000 lbs. limit for a combination-unit truck. Implementation of this project would allow the bridge to be restored to full capacity. The 2002 Potomac Subregion Master Plan designates Glen Road as Rustic Road (R-2) from Query Mill Rd to Piney Meetinghouse Rd with two travel lanes and minimum right-of-way width of 70'.

The design costs for this project are partially covered in the Bridge Design Project (No. 509132). Since the existing bridge is less than 20' long, construction and construction management costs for this project are not eligible for Federal Aid. Stream restoration work in this project is partially funded with Water Quality Protection Fund revenues.

A pedestrian impact analysis has been completed for this project.

Maryland State Highway Administration, Maryland Department of the Environment, Maryland-National Capital Park and Planning Commission, Montgomery County Department of Permitting Services, Utilities, and Bridge Design project (CIP 509132)