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Martin Luther King Bridge Inspection, Load Capacity Ratings and Rehabilitation

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The Martin Luther King Bridge, built in the 1950s, carries three lanes of traffic over the Mississippi River into St. Louis, Missouri. Modjeski and Masters (M&M) has performed multiple routine NBIS safety and fracture critical bridge inspections, including a detailed gusset plate inspection, ultrasonic testing of the truss pins, and an underwater inspection consisting of depth recordings of the channel surrounding the river piers. 

Following the inspections, M&M developed as-built and as-inspected load capacity ratings for the superstructure elements, including the gusset plates of the deck truss spans and cantilevered through truss, and the substructure elements of the steel bents. Each superstructure type was modeled and rated using AASHTOWare Bridge Rating. 

M&M also completed Phase I/II/III engineering services including the preparation of a Bridge Condition Report, TS&L plans, final contract plans, specifications and estimates for the rehabilitation of the structure. Repairs included replacement of the steel grid deck on the cantilever truss span, gusset plate and other miscellaneous steel repairs, scour mitigation, lighting repairs, and structure painting. M&M provided construction services which consisted of shop drawing review and answering RFIs.

Bridge Geometry
Length of Main Span 963 feet
Total Bridge Length 4,010 feet
Lanes on Structure 3