- Browning Road Bridge
Our team used its extensive experience with the design of low-water crossings and the Federal-Aid Off-System Bridge Replacement Program (BRO) to design the Browning Road Bridge for Jackson County, Missouri. Previously, the county was forced to close the bridge after heavy rains due to overtopping. The new reinforced concrete box culvert bridge design reduces the overtopping frequency at the crossing.
The Browning Road low-water crossing is within the James A. Reed Wildlife Area and required close coordination with the Missouri Department of Conservation. To acquire the appropriate right-of-way, the team worked with state and federal agencies to provide early communication and coordination during preliminary design, as well as a clear explanation of the safety and access improvements the project would bring to the public.
The hydrology and hydraulic analyses had a direct effect on the roadway profile, bridge type and size, project length and right-of-way. The team used previously conducted conceptual hydraulic studies and a more detailed investigation to better define the storage interaction between the various lakes and verify that flow rates were reasonable, but not overly conservative. The team used HEC-HMS to better estimate the flows for this complex analysis, and compared and adjusted flow rates to known overtopping frequencies and historic high-water formation.
Another important issue was the approach roadway geometrics. The east approach included a sharp curve (200’ R. +/-) that began just past the existing structure. There was limited sight distance on this curve due to a steep hill on the north side of the road. On the south side of the east approach, a side creek adjacent to the roadway had to be avoided with any alignment improvements.
- Bridge design
- Roadway design
- Hydrology and hydraulics
- Right-of-way acquisition
- State and federal permitting
- Construction services