Box culverts and aprons deliver a proven precast concrete solution for managing stormwater, transportation infrastructure, and utility applications. County Materials’ Box Culverts and Aprons are manufactured to support heavy loads, streamline installation, and perform reliably in demanding site conditions where strength, predictability, and a long-term service life matter.
Precast concrete box culverts provide high-capacity drainage while maintaining structural stability under traffic loads and varying cover depths. Their rectangular design maximizes hydraulic flow and offers a practical alternative to conventional round pipe systems, such as corrugated metal pipe or thermoplastics, for larger spans or higher flow volumes.
Precast concrete aprons are compatible with box culverts at inlet and outlet locations. Together, they create a complete drainage system that manages water flow, protects infrastructure, and reduces erosion-related maintenance over time.
Precast box culverts and aprons arrive on-site ready for installation, reducing the need for forming, curing, and labor compared to cast-in-place construction. This speeds up installation, improves schedule certainty, and limits disruptions to active roadways or job sites.
Off-site fabrication also reduces weather-related delays and installation variability. With consistent dimensions and controlled production, contractors can count on repeatable results and smoother coordination between excavation, placement, and backfill operations.
County Materials manufactures box culverts in accordance with AASHTO M259, AASHTO M273, ASTM C1433, and ASTM C1577 specifications. These standards cover reinforced concrete box sections used in culverts, storm drains, and sewer systems under highways, shallow-cover conditions, and other demanding installations.
Compliance with these standards ensures box culverts perform as designed when paired with precast aprons, delivering dependable strength, dimensional accuracy, and long-term durability.
Precast concrete aprons play a critical role in system performance by controlling flow transitions at culvert inlets and outlets. Aprons help dissipate energy, reduce erosion, and protect embankments, pavement edges, and surrounding soils from scour and washout.
When specified as part of a complete system, box culverts and aprons help extend service life and reduce lifecycle maintenance risks for owners and developers.
Precast box culverts and aprons are commonly used for:
· Highway and railroad culverts
· Short-span roadway bridges
· Storm drains and underground detention systems
· Pedestrian, livestock, and golf cart crossings
· Utility and conveyor tunnels
· Jacked or tunneled installations
· Groundwater recharge systems
Box culverts and aprons integrate seamlessly with other precast drainage structures, including manholes, catch basins, and inlets, simplifying coordination across complex site layouts.
County Materials’ Box Culverts and Aprons provide a complete, job-ready drainage solution that supports construction efficiency, structural performance, and long-term durability.
Connect with our team to discuss sizes, availability, and specification support for your next project.