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I-95 / SR1 Interchange New Castle, Delaware

Delaware Department of Transportation (DDOT)

Cherry Hill Contract Value:
$98.8 Million

Project Description
CHC is currently constructing this $98.8M project for the I-95 / SR 1 Interchange in New Castle County, DE adjacent to the Christiana Mall. This project is part of a multi-year, multi-project Turnpike Improvement Program requiring coordination with numerous stakeholders.  The main purpose of this project is to relieve congestion at a highly traveled interchange by adding high speed connecting on and off ramps, 2 new lanes on I-95 NB, and 6 new bridges.  Due to limited foundation locations within the existing roadway and skewed flyover alignment, new bridges required post tensioning via integral pier caps (girders temporarily supported by shoring towers) and straddle bent type piers with draped tendons.

Major Items of Work included:

  • Seven-phased MOT plan to allow continuous traffic on SR 1 (ADT of over 92,700) and I-95 (ADT of over 207,000) as well as maintain all ramps and access to commercial properties including Christiana Mall
  • Over 317,000 CY of excavation and embankment construction
  • Importing and placing over 112,000 CY of borrow
  • Six new bridges and widening of 1 existing bridge utilizing 31,848 LF of driven pipe pile foundations,  cast-in-place footings, abutments and piers, fabricated structural steel plate girders (4 of which included curved girders), and cast-in-place deck, parapets and approach slabs
  • Over 8,500 cubic yards of substructure and superstructure concrete
  • 160,000 SF of mechanically stabilized earth (MSE) retaining walls utilizing select fill, #57 stone backfill, as well as cementitious light weight fill
  • 18,834 LF of various dia. (15 to 21) storm drain and over 200 inlets and manholes
  • 50,208 SY of 12 concrete paving
  • Over 100,000 tons of asphalt placed over 90,000 tons of graded aggregate base
  • Installed approx. 30,600 LF of new cast-in-place barrier wall