The Horse Barn Road Project consists of a 70+ year-old timber bridge that was deemed “defective” in 2021. Erosion was found beneath the structure and the current alignment was not suitable for the proposed conditions.
We determined the following permits were required for this project: environmental resource permit (ERP), Florida Department Environmental Protection (FDEP), nationwide permit and a construction permit. Our plan calls for demolishing the existing bridge and replacing it with a concrete box culvert that includes wing walls to account for the existing open channel flow of the creek. Essentially the dirt road is repaved, 50 feet on each side of the box culvert. We conducted a geotechnical analysis to determine the soil layer and its respective strength. Then, we did a hydraulic analysis to consider the hydrological features of the watershed and the hydraulic capacity of alternatives. Our results indicated that both alternatives have high conveyance efficiency, so we selected a precast box culvert with wing walls and performed a structural analysis. We determined live loads, dead loads and geostatic pressure to ensure the slab foundation and wing walls were structurally sound.
We realigned Horse Barn Road to meet our minimum length of curve radius and to preserve an existing tree on the site. The road base consisted of six inches to support the roadway use load and conditions. To enhance the roadway conditions, we added reflective signage and pavement markings to increase user mobility and safety.
Joshua Davis, Venet Desir, Mkharis Lindsey, Octavius Maxey, Tyree Young
Sean Martin, Ph.D., PE, FRSE
Mead and Hunt; Micheal Schwier, P.E., Matt Johnson, P.E., Fadi Alsharif, P.E.
Spring