Reconstruction of I-95 over West River & Bridge Replacement

New Haven & West Haven, CT
Connecticut Department of Transportation

This section of I-95 is one of the most heavily traveled in CT, carry over 135,000 vehicles per day across the West River. Middlesex value engineered an innovative demolition and construction approach for the north bound span that combined eliminated 105 days of lane closure impacts.

 

The existing I-95 NB and SB twelve span bridges over the West River were replaced with two new five span structures. The new bridges will have a combined total width of 141 feet including three lanes each direction. The new structures are on a new alignment, new ramps were constructed or partially constructed to tie in to existing ramps. The exiting I-95 SB ramp to Kimberly Ave. was removed. The existing Ella T. Grasso Blvd bridge was replaced.

The as-bid phasing called for installing the new I-95 NB structure to the east of the existing and removing the existing bridge using conventional demolition methods under nightly lane closures with equipment placed on the new inservice structure and the exiting I-95 SB bridge.

Middlesex re-engineered the approach to remove entire bridge spans using gantries mounted on SMPTs. Spans were removed to the median area off the bridge for processing during the day. To eliminate lane closures need for steel erection, construction was re-engineered to launch the fully assembled spans from the median. Over 105 nights of lane closure impacts were eliminated in total.

Project Numbers

$131M

Project value

175,100

SF of new bridge

82,500

LF of precast piles

25,000

CY of lighweight fill

290,000

LF of wick drains

150,000

CY of excavation