anchor Description
This project provides for the replacement of the existing Mouth of Monocacy Road Bridge over Little Monocacy River. The existing bridge, built in is a long single-span structure with steel beams and corrugated metal deck. The existing clear roadway width is with one lane on the bridge carrying two-way traffic. The proposed replacement bridge includes a single-span steel beam structure carrying a roadway. The Scope of Work is being revised to a full structure replacement rather than a superstructure replacement because the existing abutments are not founded on rock and have experienced undermining and re-sedimentation during the life of the bridge. The proposed structure will utilize drilled shaft-supported abutments behind the existing cantilever abutments to support a slightly longer steel superstructure. The project includes approach roadway work at each end of the bridge to tie into the existing roadway. The bridge and road will be closed to traffic during construction. Accelerated bridge construction techniques will be utilized to minimize the disruption to the traveling public and local community.
anchorCapacity
The Average Daily Traffic (ADT) is approximately vehicles and the roadway capacity will not change as a result of this project.
anchorEstimated Schedule
The design is expected to be completed in the winter of Construction is scheduled to begin in summer of and be complete in winter of The bridge will be closed to traffic from September to December
anchor Justification
The proposed replacement work is necessary to provide a safe roadway condition for the traveling public. Mouth of Monocacy Road Bridge is defined as structurally deficient due to the condition of the superstructure. Recent inspections revealed that the steel beams and bearings are in poor condition. The top and bottom flange of the exterior beam have severe pitting with up to percent section loss over most of the length. The bottom flanges of exterior beams have up to percent section loss at both abutments up to from the bearing locations. The bottom flanges and the full-height of the web at each end of the interior beams have severe section loss with pitting up to in diameter at the beam ends. The bearings have over percent section loss to the bearing plates. The bridge has posted load limits of Gross Vehicle Weight (GVW) and Gross Combined Weight (GCW). Implementation of this project would allow the bridge to be restored to full capacity. The approved and adopted Rustic Roads Functional Master Plan designates Mouth of Monocacy Road as Exceptional Rustic Road from Mt. Ephraim Road to the bridge over Little Monocacy River with minimum right-of-way width of The bridge provides the only means of access to about ten homes.
anchorOther
The design costs for this project are covered in the Bridge Design project (CIP No.
anchorFiscal Note
The costs of bridge construction and construction management costs for this project are eligible for up to percent Federal Aid.
anchorDisclosures
A pedestrian impact analysis has been completed for this project.
anchorCoordination
Federal Highway Administration - Federal Aid Bridge Replacement/ Rehabilitation Program, Maryland State Highway Administration, Maryland Department of the Environment, Maryland-National Capital Park and Planning Commission, Montgomery County Department of Permitting Services, Rustic Road Advisory Committee, CSX Transportation, Utilities, and Bridge Design Project CIP