J-J Hook Temporary Barriers

We are Colorado’s exclusive supplier of the J-J Hook® temporary traffic barrier system.
J-J Hook® barriers offer a self-aligning connection that automatically hooks into place, requiring no pins, bolts, or loose hardware.

Meets the new MASH/FHWA requirements set to take effect January 1st, 2020.

What We Offer


39th Ave and Park Hill Drainage

Denver, Co.

SEMA Precast supplied 5,714 lineal feet of box culvert for the City & County of Denver’s 39th Ave & Park Hill Drainage project.

The project consisted of 9 different size box culverts ranging from 8’x5′ to 15’x10′.  All boxes supplied with water-tight gasketed joints.