Boulder County

Fourmile Canyon Flood Recovery

Boulder County, CO

Unprecedented rainfall in north central Colorado caused a 100-year flood event in September 2013 resulting in massive infrastructure damage still being addressed years later. Boulder County was hit particularly hard when 12-16 inches of rain, nine times the average September monthly rainfall total, fell in just four days. Hundreds of miles of roads were washed out. In some cases, small mountain towns were surrounded by water making it impossible for residents to leave their homes.

To initiate reconstruction efforts, Benesch provided construction management and inspection (CM&I) services to address flood damage repairs in the Fourmile Canyon area, including four separate projects within one constrained corridor. CM&I services included overseeing the construction of several different types of retaining walls, bridge and roadway reconstruction and stream restoration work. Along with oversight of the construction process, Benesch coordinated with both the Colorado DOT and FEMA to meet standards requirements.

Benesch is an experienced flood recovery firm, completing numerous recovery and repair projects in the Front Range of Colorado. As is typical for mountainous construction, these projects have a major impact on the traveling public. Lack of space to easily divert traffic around a work area and the inability to utilize a detour to maintain access means traffic must be maintained through congested construction sites. Benesch utilized an extensive public involvement process to balance necessary infrastructure construction with minimal inconveniences to local businesses and residents. In addition, the Benesch team incorporated sound ecological practices during stream restoration and revegetation to establish a more sustainable and resilient watershed.

Project highlights

  • Four simultaneous projects addressing flood damage
  • Work within a constrained mountainside corridor
  • Comprehensive scheduling strategy
  • Extensive public involvement efforts
  • Numerous stakeholders
  • Coordination with owner’s design team, Colorado DOT, FEMA, NRCS/EWP, contractor(s) and subconsultants for stream restoration, additional CM/CI capacity and materials testing.