SH-7 Roadway Design: Bridge and Approaches over Pecan Creek
The primary purpose of this project is to replace the existing span structure with a Reinforced Concrete Box (R.C.B.) and add approach roadway. We performed a hydraulic report to determine the size of the R.C. box replacing the existing three-span bridge (Bridge "A"). The road remained open during construction, with a shoo-fly detour south of the existing roadway alignment. Construction of the R.C. box cleared the zone under the existing bridge, and the offset for the shoo-fly will held to the minimum required. The road will have a 40' clear roadway with 12' wide lanes and two 8' wide shoulders.
We checked the existing vertical alignment's geometry to ensure it met 3R design criteria, redesigning vertical alignments that did not meet 3R criteria to meet 4R criteria. All designs for side slopes met the 4R criteria.
Guernsey's design plans included grading, drainage, surfacing and erosion control, right-of-way construction plans, topographical survey, geotechnical investigations, hydrology/hydraulics, engineer's estimate, traffic plans, and structural design.
Guernsey also performed environmental activities in compliance with the National Environmental Policy Act (NEPA), the Council on Environmental Quality Regulations for Implementing NEPA, the Federal Highway Administration (FHWA) Regulations, the Federal- Aid policy Guides, the procedures for specialist studies and environmental documents as specified, and all required permits. All work conformed to current State, Federal, and Department policies and standards, as modified by the Department.