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Lindbergh Relocation -North Roads
Client: HDR
Owner: City of St. Louis/ MoDOT
Completion Date: Mar 2002
Const. Value: $10,000,000

As a subconsultant ABNA is responsible for topographic surveys, drainage, and utility design for a series of three ancillary road projects associated with the expansion of St. Louis Lambert Airport.  The contract involves the design of relocated Lindbergh north of the new Lindbergh Tunnel, relocated Missouri Bottom Road, and the Temporary North Lindbergh Bypass. 

 One particular challenge of this project is that each of the three roads will be let separately for construction but all three designs must be coordinated as one project.  Drainage elements include culverts, area inlets and drop inlets.  Utility design includes duct banks for electrical and mechanical elements as well as relocating and designing sanitary and combined sewers to accommodate the new surface flow.  ABNA is also responsible for designing a local road that will be included in the Lindbergh portion of the job.

Lindbergh/Natural Bridge Interchange
Owner: City of St. Louis/ MoDOT
Completion Date: Oct 2001
Const. Value: $10,000,000

ABNA was a joint-venture partner on the design of the interchange connecting the new alignments of Natural Bridge Road and Lindbergh being relocated for the Lambert Airport Expansion project.  For this effort ABNA was responsible for designing an 1800’ 5-lane section of Natural Bridge, an 800’ retaining wall along Lindbergh, a 600’ retaining wall along the HI-Connector, and slope stability walls for the bridge.  We also prepared plans for the lighting and drainage on both Lindbergh and Natural Bridge.  There were three traffic signals that had to be designed for this project to serve Natural Bridge and the HI collector.  ABNA also prepared the traffic control and construction staging plans.

Natural Bridge Road West
Owner: City of St. Louis/ MoDOT
Owner: City of St. Louis/ MoDOT
Completion Date: Sep 2001
Const. Value: $4,000,000

This project involved realigning existing Natural Bridge Road about half mile south of the existing alignment. The 1300 feet long new pavement is two (2) lane – two (2) way  roadway. Also involved is pavement design, drainage design, detention basin, traffic control and traffic signals. The challenge on this project is to transition this new roadway pavement  to the Lindbergh interchange which has four (4) lanes. This transition had to be geometrically fitted within a 300 feet length. ABNA Engineering is the design engineer responsible for the realignment of Natural Bridge West, all lighting, traffic signals, drainage and traffic control.  The roadway is being relocated 2000 feet South to accommodate the St. Louis Lambert runway expansion.  ABNA is responsible for PS & E.