CO 133 McClure Pass Fault Repairs

Project Facts

  • Cost: $1.3 million
  • Contractor: Anderson Drilling
  • Timeline: May - October 2018
  • Location: In both directions of CO 133, from mile points 40.54 to 40.61, about five miles south of the Marble turn off

On May 14, 2018, CDOT began reinforcing a fault, aka a rock slip, on Colorado Highway 133—on the south side of McClure Pass—in Gunnison County.

Specific work includes stabilizing and reinforcing a landslide below the roadway to reduce the risk of further slipping or future rockslides. Work items will involve:

  • excavating approximately 3,750 tons (or 3,000 cubic yards) of rock material;
  • drilling approximately 18, 60-foot-deep caissons, into which vertical and horizontal reinforcing supports (or rebar cages) will be positioned;
  • installing rebar cages, a circular set of 18, 60-foot sections of rebar that are 24 inches in diameter;
  • constructing a tieback system, which incorporates high-strength steel strand anchors, that are grouted in-place to anchor the vertical caissons.
  • repairing and reconstructing the damaged roadway;
  • conducting earthwork and erosion control; and
  • adding new striping and signage.


  • Work hours are 7 a.m. to 7 p.m., Monday through Friday.

Travel Impacts

  • Through mid-October 2018, travelers can expect single-lane, alternating travel, and periodic full traffic holds of up to 15 minutes.
    • Please note: Delays will exceed 15 minutes, as traffic queues must be cleared in each direction.
  • There will be a 10-foot width restriction in place during work hours.
  • Please avoid distractions when driving through the work zone, and go Slow for the Cone Zone!

Adjacent Projects

This summer/fall, there will two additional (and separate) projects underway on CO 133: