CrownSpan® Precast Bridge Units


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CrownSpan® Precast Bridge Units are rectangular three-sided structures mounted on cast-in-place footings. They can be installed for single or multiple cell applications and are recommended where:

  • Natural stream bottoms are desired
  • Wetlands must be spanned
  • The span is larger than can be accommodated with a standard box culvert
  • Cost and time of construction are critical


CrownSpan® Precast Bridge Units are produced for the following:

  • New or replacement highway bridges
  • Storm drains
  • New culverts
  • Culvert extensions
  • Utility or pedestrian tunnels
  • Storage facilities


CrownSpan® Precast Bridge Units are available with spans ranging from 10 feet to 40 feet and rises up to 12 feet. Maximum and minimum sizes vary according to market area. Please contact your Forterra representative for specifics.


The following joints are normally available for CrownSpan® Precast Bridge Units:

  • Butt joints with an external joint wrapper


A variety of linings and coatings are available as dictated by project conditions.

Applicable Specifications

The following specifications apply to CrownSpan:

  • AASHTO Standard Specifications for Highway Bridges
  • ASTM C1504 Manufacture of Three-Sided Structures for Culverts and Storm Drains
  • State DOTs
Grounded In Strength