Interstate 84 Bridge Replacement and Interchange Configuration

County: Lackawanna County
Municipality: Dunmore Borough & Roaring Brook Township
State Route: SR 435
Project Type: Bridge Replacement
Proposed Construction Start: 2019
Proposed Construction End: 2026

The I-84 Section 282 project includes the replacement of 2 mainline bridges carrying I-84 EB & WB over Roaring Brook and the active Delaware, Lackawanna and Western (DL&W) Railroad and the reconfiguration of Exit 2 with SR 435 in Dunmore Borough and Roaring Brook Township, Lackawanna County. The current left-hand exit to SR 435 SB will be reconfigured with a more conventional right-hand exit that includes a structure carrying the ramp over both I-84 EB & WB.

The difficult project site includes an active railroad, Roaring Brook, and steep terrain requiring the construction of several access roads, staging areas, crane pads, and a temporary stream crossing of Roaring Brook for construction access, erection, and removal of the existing bridges.  

Phase 1 construction was to construct a 12-foot travel lane in the median on the eastern side of the Interstate 84 Eastbound (EB) Bridge. Once constructed, the right lane on Interstate 84 (EB) was closed to traffic and traffic was shifted into the left lane and the newly constructed lane.  The right lane is being used to access the staging area and temporary access road.

Phase 1A construction was to prepare the project site to begin construction. The project site includes an active railroad, Roaring Brook, and steep terrain requiring the construction of several access roads, staging areas, crane pads, and temporary stream crossings of Roaring Brook for access, construction, and removal of the existing bridges. An existing, abandoned, railroad bridge carrying the former Erie & Wyoming Valley (E&WV) Railroad over DL&W Railroad and Roaring Brook will also be rehabilitated as part of the project to facilitate construction access. The bridge will be returned to Lackawanna County after construction is completed and will be incorporated into a future walking trail system.

Phase 2 construction is to construct a portion of the new Interstate 84 (EB) roadway and bridge on the new alignment in the median between Interstate 84 eastbound and westbound. Traffic will use the newly constructed roadway and bridge during the demolition of the existing Interstate 84 (EB) bridge and the construction of the remaining portion of the new Interstate 84 (EB) bridge and roadway in phase 3.

Phase 3 construction is to demo the existing Interstate 84 (EB) bridge and start the construction of the remaining portion of the new Interstate 84 (EB) bridge and roadway. State Route 435 exit ramps and fly-over bridge will also be constructed in this phase.