Highway Drainage

FP1200 Highway- Suspended Install

Roadway Drains

Trench drain systems for highway use need to be approved by the Department of Transportation within the state of the project. The approved products from state to state are similar and have a few similar properties.

Roadway trench drain systems can be used at crossroads to keep run-off water from entering other sections of the road such as toll booths and weigh stations. However, a large percentage of trench drains that are installed in roadways run parallel to the direction of traffic.

When roads are flat with little or no natural slope, trench drains are used in the median and shoulder areas.


  • Water Detour
    Highways go on for miles leaving rain water with no soil to soak into. Knowing the water capacity will help you select the right trench drain system to properly handle the flow.
  • Wide Open Spaces
    Large volumes of water can easily be handled with Class D grates that have large flow area openings. The drainage channels they cover are available in sizes that can meet the capacity established by the flow requirements.
  • Street Cleaner
    Grates with bolt-down systems are a must in this application. They not only increase the strength of the drain but keep stones and debris from getting under grates that can cause damage over time. However, make sure clean-out sections are included for easy maintenance.

Product Recommendations

USF 6235 Slotted Ductile Iron 24″ X 24″ Catch Basin Grate | Load Class D

SKU: USF 6235
Load Class D
System: Frame and Grate, Trench Era
Grate Material: Ductile/Cast Iron
Grate Pattern: Slotted
Grate Height: 1 1/2 inch
Grate Width: 24 inch
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Iron Age IA-INTER-0920 Interlaken 9×20 Cast Iron Grate – RAW

Load Class B
System: Frame and Grate, MEA EN2000
Finish: Natural, Raw
Grate Pattern: Interlaken
Grate Height: 3/4 inch
Grate Width: 9 inch
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FG-MICRO-CB18 Class A ADA Compliant 18″ x 18″ Grate – Dark GRAY

Load Class A
System: Frame and Grate
Grate Material: Fiberglass
Grate Pattern: Mesh
Grate Width: 18 inch
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