What are the Colorado Precast Type 7 Concrete Barrier Specifications?

Tips & Advice

The Colorado Department of Transportation outlines specifications regarding the proper dimensions for precast type 7 barriers, including general notes and specifications.

Colorado Precast Type 7 Concrete Barrier General Notes

  1. All steel reinforcing should be 2 inches clear of the nearest surface of concrete unless otherwise shown. Reinforcing steel should be Grade 40 minimum.

  2. Concrete should be Class D.

  3. All permanent precast barriers used to replace other concrete barriers should be in new condition, undamaged and with no repairs.

  4. For temporary installations, install with a minimum of 4 feet distance from the centerline of the concrete barrier to any obstructions behind it. For temporary installations with less than 4 feet minimum distance, stabilization pins should be used on each barrier unit adjacent to, and within 10 feet of both sides of the obstruction.

  5. The flare rate for temporary installations should be 10:1 or flatter unless otherwise approved by the engineer.

  6. Stabilization pins should be used to anchor each 10 foot unit in all permanent installations.

  7. The month and year that the precast type 7 concrete barrier was manufactured should be molded into one end of each 10 foot barrier unit.

  8. Approved non-shrink grout should be used for grouting over all pins and grouting of scuppers.

  9. When hydraulic analysis allows, scupper may not be needed on:

a. Median installation with inlet drainage.

b. Shoulder barrier on high edge of a superelevated shoulder.

c. Median barrier on a crest vertical curve.

d. Permanent barrier, if specific on plans.

  1. All incidental work and materials such as connecting pins, anchors, bolts, grout and excavation for end anchorage will not be paid for separately, but should be included in the work.

  2. One-inch diameter threaded inserts may be cast in place to facilitate lifting for temporary barrier applications only.

  3. Retroreflectorization is required on barriers.

Colorado Precast Type 7 Concrete Barrier General Notes

According to the Colorado Department of Transportation elevation view details, precast type 7 concrete barriers should include the following features and conform to the following dimensions:

  • Height: 34”

  • Loop bars: ¾” diameter; loop bars should protrude by 2” from the end of the barrier; on the right side, there should be 14” between the end of the lower loop bar and the end of the middle loop bar, and 4” between the end of the middle loop bar and the end of the upper loop bar; these dimensions should be flipped for the left side

  • 1” chamfer or radius on each face.

  • Two 3” x 12” scuppers

  • 28” between the end of each scupper and the end of the barrier

  • Four 9’-4” #5 bars

For more information specifically regarding Colorado type 7 barrier wall with pin and loop connections, check out our recent blog post.

This blog post is an interpretation of specifications by the Colorado Department of Transportation. Please consult with Colorado DOT's most recent requirements for definitive information.

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