I-95/I-276 Interchange

Philadelphia, PA

A new high speed interchange between I-95 and I-276 was constructed, which included the widening of eight miles of I-276. Borton-Lawson prepared the design of several thousand lineal feet of arterial roadway on five different alignments, including extensions for two existing box culverts to accommodate the widening of I-276.

Challenges V. Solutions

Challenge Provide sufficient space between the mainline of the turnpike and Mill Creek to allow for the construction of additional travel lanes and ramps for interchange.

Solution Designed several thousand feet of retaining wall to facilitate the construction of additional westbound travel lanes with minimal right of way.

ChallengeProvide the requisite additional travel lanes and minimize environmental impacts in an area where highway widening was planned adjacent to several county parks and one of few remaining contiguous natural areas in the area.

SolutionWorked closely with several state and federal agencies to reduce the project’s footprint, minimize deforestation, mitigate flooding, and lessen impacts to forested riparian buffers in the area. Natural stream channel design methods were used to stabilize the relocated portion of the Mill Creek.

ChallengeIntegrate requisite highway improvements into a crowded commercial corridor with considerable existing infrastructure.

Solution Implemented an effective design using a thorough knowledge and understanding of turnpike, PennDOT and local design standards.

ChallengeEfficiently manage stormwater runoff from acres of new impervious surface associated with the construction of new travel lanes and ramp connections.

SolutionApplied our extensive experience with Stormwater Management Planning and firsthand knowledge of the Neshaminy Creek and Mill Creek Watersheds to create a hydrologic model of the project and comprehensive post construction stormwater management plan.