- I-45 Widening
We developed plans, specifications and estimates (PS&E) for the widening of Interstate Highway 45 in Navarro County, Texas. The project began just north of Corsicana and extended south for 22 miles. The existing four-lane divided highway was widened on the inside to create a six-lane undivided section. In addition to the general widening, this project included full reconstruction and reconfiguration of three trumpet-style interchanges that improved safety by eliminating existing left-side on- and off-ramps.
In total, the project included 26 main lane bridge widenings and four bridge replacements. This included two direct connector bridges, one frontage road and one main lane bridge replacement. It also included two railroad and two grade separation widenings in Corsicana.
The scope of services included development of design criteria and layouts for each of the bridge widenings and bridge replacements; final design and development of plans, specifications and estimates for each bridge; and coordination with the UPRR and BNSF railroads and third-party utility companies. Bridge types included cast-in-place concrete pan girder and precast, pre-stressed concrete beam bridges.
The project also entailed the layout and design of six mechanically stabilized earth (MSE) retaining walls and two soil nail walls. This effort required close collaboration with the project geotechnical engineer to select the appropriate wall type for each location. We were also responsible for all roadway and drainage design for this project, as well as integration of all roadway barrier, wall and approach details at each bridge location.
The entire PS&E package, including 30 bridges, was developed in 4½ months to meet the letting schedule.
- Plans, specifications and estimates (PS&E)
- Paving and drainage
- Bridge design
- Traffic control
- Construction sequencing
- Stormwater pollution prevention plan (SWPPP)