In the Varney River Drainage District jurisdiction, the MoDOT SE District required plans for the Route A over the Main Ditch, Bridge No A9312, project. BFW accepted the project and provided design engineering services such as:
- Preliminary roadway plans
- Final roadway plans
- Hydraulic modeling
- Bridge memorandum
- Final bridge plans
- Geotechnical investigations and reporting
- Job special provisions
- Cost estimates
In addition, BFW had to coordinate design concepts with the Drainage District to properly replace the structure. The site was near an extensive US Army Corps of Engineers project to improve levee protection and stormwater runoff into the St. Francis River. As part of the Army Corps project, the watershed for this stream was significantly altered and historic flow records were not representative of expected performance, so extensive 2D hydraulic modeling was used to establish stormwater requirements in the altered watershed. BFW ensured the final structure met all needs and expectations with many tests of the new bridge and its features such as:
- Tests and Verification:
- Load rating via AASHTOWARE Bridge Rating Software
- Verified results with Leap Concrete software and internal spreadsheets
- New Bridge Features:
- Single-span precast prestressed concrete box beam superstructure
- Composite reinforced concrete deck
- 76-foot back-to-back abutments
- 27-foot out-to-out deck width
- Integral abutments
BFW ensured that the load rating followed the LRFP methodology per AASHTO standards and is proud to have contributed to the improvement and safety of MoDOT’s bridges and roadways.
