WILLIAMS COUNTY, SOUTH OF EPPING, ND
WILLIAMS COUNTY ROAD 42 TRIPLE 14' x 12' BOX CULVERT
In 2015, Williams County engaged Ackerman-Estvold to evaluate the replacement of the existing bridge on County Road 42 located 1.25 miles south of Epping, ND. The existing 30’ single span bridge over Stony Creek consisted of vertical concrete abutments and concrete U-beam decking. At the time, the bridge had deficiencies that were nearing a critical state and replacement was inevitable. Additionally, County Road 42 was a narrow paved rural two-lane roadway providing a south access to the City of Epping, developing residential subdivisions and a crude oil transload facility.
A hydraulic analysis of the existing bridge was completed that determined the existing conditions the proposed structure would have to meet while satisfying current state and local design criteria. Replacement alternatives included a bridge and precast box culvert configurations. In addition to the hydraulic requirements, an economical and environmental analysis was completed for the bridge replacement. The result was a triple cell 14’x12’ reinforced concrete box culvert being the selected option for this project.
The roadway improvements that went along with the bridge replacement included a 0.1 mile grade raise to improve the vertical curve and to meet the corridors design speed at the new box culvert location, widening 0.4 miles of the existing 24’ asphalt roadway to 30’ to include 12’ lanes and 4’ shoulders, ditch construction, culvert replacement, and rumble strips to enhance overall roadway safety. The replacement of the bridge and roadway widening resulted in additional roadway easement and mitigation of the disturbed wetlands to obtain and satisfy the US Army Corps of Engineer’s Section 404 Permit.
Ackerman-Estvold designed this project to NDDOT standards specifications and preformed the construction engineering for this project. Fortunately, the construction of the project was scheduled to begin within a couple weeks when the bridge was abruptly closed after a routine inspection noted substantial movement of the bridge deck relative to one of the abutments. This $1.25 million project was completed in 2016.