Roundtop Road Structure Replacement Project

County: Dauphin
Municipality: Londonderry Township
State Route: Route 2005-019
Local Name: Roundtop Road
Project Type: Structure Replacement
MPMS Number: 100083
Proposed Construction Start: Spring 2027
Proposed Construction End: Fall 2027
Last Updated: May 2025

The Route 2005, Section 019 structure replacement is located along Route 2005 (Roundtop Road) over Iron Run, in Londonderry Township, Dauphin County. The purpose of this project is to replace the existing single span steel rolled beam bridge supported on full height masonry abutments with a new structure compromised of a composite concrete deck, prestressed concrete box beams, and supported by integral abutments on steel beam bearing piles.

The existing structure, built in 1934 and rehabilitated in 1948, is a single span steel rolled beam bridge on full height masonry abutments on a 75-degree skew. The bridge length is 31-foot, with a 23-foot 10¾-inch curb-to-curb clear roadway width.

Portions of the existing stone masonry abutments will remain for scour protection.  The proposed structure will include a concrete bridge deck along with PA Type 10M bridge barrier.  Additional work includes placing rock scour protection at portions of the existing abutments that are to remain, reconstructing the pavement along the roadway tie-ins, and installing MASH-compliant guide rail, where applicable.  The proposed roadway configuration will feature two (2) 11-foot lanes and 4-foot shoulders, that will taper back into the existing roadway widths.

This section of Roundtop Road has an average daily traffic volume of 657 vehicles per day.

The bridge will be closed for approximately 6 months to all traffic during construction. The proposed 2.3-mile detour will utilize Route 341 (Colebrook Road) and Route 2002 (Schoolhouse Road) to route the traffic back onto Roundtop Road.  Please refer to the project’s Detour Plan graphic. Access to all driveways within the project limits will be maintained during construction.

Overhead utilities are present through the corridor; with the need for relocation still to be determined.  The gas line on the western edge of the road will need to be relocated.

The project is currently in design, and construction work is anticipated to begin in 2027 and last approximately 6 months.

The purpose of the plans display is to introduce the project and solicit public input, questions, or concerns regarding the project.​

Environmental Considerations

The bridge is located in a rural area of Londonderry Township, with land use primarily consisting of residential use with a small, wooded area. Pedestrian or bicycle facilities do not exist through this section of Route 2005 (Roundtop Road).

All work on the structure will be out of stream, behind the existing structure abutments due to the proposed integral design.

No wetlands were identified in the project area.

Coordination for Threatened and Endangered species has been conducted.

Cultural Resource investigations are currently being completed as part of the preliminary engineering studies.

Utilities

Overhead electric and data/communication lines and poles are present at the site. Utility relocations are anticipated to accommodate construction operations.

The existing bridge carries a gas line that will require coordination and relocation as a part of the structure replacement project.

Maintenance and Protection of Traffic

The bridge will be closed for approximately 6 months to all traffic during construction. The proposed 2.3-mile detour will utilize Route 341 (Colebrook Road) and Route 2002 (Schoolhouse Road) to route the traffic back onto Roundtop Road.  Please refer to the project’s Detour Plan graphic. Access to all driveways within the project limits will be maintained during construction.

Construction Schedule and Cost

Construction is anticipated to begin in Spring 2027 and last approximately 6 months. The estimated construction cost is $1,300,000.