Layton Bridge Improvement and Replacement

County: Fayette
State Route: 4038
Local Name: Layton Bridge
Project Type: Bridge Improvement & Replacement
Last Updated: 07/08/2025

Date to be determined.

The proposed replacement of the Layton Bridge, means to incorporate:

• Replacement of the single-span, single-lane bridge carrying Layton Road over Washington Run.
• Improvements to the associated roadway connecting the two structures, as both bridges were originally designed and utilized by a railroad.​​

With Layton Bridge on the National Register of Historic Places, PennDOT is required to adhere to Section 106 of the National Historic Preservation Act. 

The Historic Bridge Rehabilitation Analysis (HBRA) is required under the Section 106 process to investigate, analyze, and determine if it is possible to rehabilitate a historic bridge to meet the purpose and need of the project. 

An Alternatives Analysis was prepared in late 2018, where various rehabilitation options and a full replacement alternative were compared. The analysis considered many factors, including ability to meet the projects’ purpose and need, environmental and property impacts, safety, constructability, and cost. 

Comments were solicited and the reports amended as appropriate. PennDOT shared the aforementioned reports with various consulting parties, PA State Historic Preservation Office (SHPO), and the Federal Highway Administration (FHWA). The efforts were complete in fall 2020 with concurrence from PA SHPO and FHWA. Once all comments were addressed, a preferred alternative was selected in January 2021.

This p​​roject has substantially completed the Section 106 Historic Structure process in the preliminary engineering phase wherein the project team has completed efforts and submitted the Historic Bridge Rehabilitation Analysis (HBRA) and the Alternatives Analysis.​

The selected option, currently in the preliminary engineering phase (as of May 2021) replaces the existing Layton Bridge with a new bridge slightly to the east.  This will allow the existing bridge to remain open during construction.  A letter of agreement with the FHWA, the PA SHPO​, and PennDOT was fully executed on 09/30/2022 for mitigation of adverse effects created by the replacement of the Layton Bridge.​

Detailed surveying and mapping of the project corridor was completed in fall 2021.  Conceptual alignments were evaluated in advance of setting the preliminary line, grade & typical section of the roadway. 

Further development of preliminary roadway plans and bridge concepts are ongoing. Final design will start once environmental clearance is achieved.

The bid date is to be determined.