A New Design to Mitigate Years of Flooding.
To mitigate years of flooding over the roadway, the final design raised the road approximately five feet to bring it out of the floodplain. The improvement also included the reconstruction of two bridges over Marley Creek between Haas Road and Spring Meadows Drive. The total project length was approximately one mile. Civiltech provided Structural, Design, and Water Resources Engineering.
Working within the 100-year Flood Plain
Close coordination was required with the USACOE and the IDOT Bridge Office to allow a permit to be obtained for construction. Compensatory storage was required within the floodplain due to the excessive amount of fill being placed under the roadway to bring it above the 100-year flood elevation.
Reconstructing the Bridges
The elevation of the bridges was raised and the spans were lengthened to allow Marley Creek to flow freely without obstructions. The multi-span bridge designs included PPC IL36 beams. The east bridge length was 271 feet and the west bridge length was 204 feet.
Accommodating the Water
An existing tributary was realigned to pass under the newly constructed west bridge with the main creek, eliminating an existing cross road culvert. The project also included cleaning out two large cross road culverts that have silted up over the years improving drainage between the north and south sides of US Route 6.
Investigating Maintenance of Traffic Options
US Route 6 is a major route providing east-west travel in this portion of Will County. A detailed traffic maintenance plan was needed to allow a safer construction zone, allow traffic from Haas Road and Spring Meadows Drive access to US Route 6, and permit traffic to safely and efficiently flow through the area. Several options were investigated including constructing each bridge at separate times during the construction sequence, providing a one-way detour along US Route 6, and installing temporary signals at each bridge.
This Project Incorporates the Following:
- Flooding mitigation
- Bridge reconstruction
- Raising roadway elevation
- Creating compensatory storage
- Multi-span bridge design
- Realigning a tributary
- Cross road culvert cleanout
- Maintenance of traffic
- Funding
- Federal, State
Scope of Services
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Roadway and Highway Design
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Drainage Design
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Highway Bridges
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Type, Size & Location Drawings
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Topographic Survey
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Geotechnical Investigation
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Pavement Design
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Interagency Coordination
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Preparation of Contract Plans, Specifications and Estimates
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