Daniel Boone Bridge

Details
Location: St. Louis/St. Charles counties, Mo.
Services: Bridge and roadway engineering design services
Project Cost: $120 million
Client/Owner: Missouri Department of Transportation, District 6
Estimated completion: 2011

Description
The Missouri Department of Transportation chose Hanson to lead the design team for the new Daniel Boone Bridge, which carries Route 40 (the future I-64) over the Missouri River in St. Louis. The project also includes the realignment of approximately two miles of interstate and improvements to the outer road system.

The Daniel Boone Bridge crossing is currently serviced by two structures. The first bridge was constructed in the 1930s as a two-lane structure. It currently carries three lanes of westbound traffic. The second bridge was constructed in the 1980s as a three-lane structure. It currently carries four lanes of eastbound traffic.

The new bridge will be constructed to provide four additional lanes across the river. Eastbound traffic will move from the 1980s bridge to the new bridge, and the westbound traffic will move from the 1930s bridge to the 1980s bridge. The 1930s bridge will remain in use as an outer road structure, providing for one westbound lane and a bicycle lane. Approximately one mile of interstate on both sides of the river will be reconstructed to realign with the appropriate structures.

Services
The scope of the initial contract includes:

• a hydraulic analysis and scour study of the Missouri River,
• a bridge type study,
• preliminary bridge design,
• field surveys,
• preliminary roadway plans, and
• right-of-way plans.

Final bridge and roadway design is to be negotiated following the completion of the preliminary design phase.