SH 21 Powers Blvd. and Old Ranch Interchange

Colorado Springs, Colorado

Tsiouvaras Simmons Holderness served as the prime consultant for this interchange reconstruction project on a heavily used divided state highway (Powers Blvd). The existing configuration of Powers Boulevard consisted of at-grade intersections with Old Ranch Road and had a high number of traffic incidents. Using the existing alignment and intersections as the planned on/off ramps, the interchange was reconfigured with a new bridge carrying Old Ranch over the new mainline for Powers. In addition to the new 2-span bridge and mainline Powers roadway construction, the project included the design of 2 new retaining walls, extensive grading, drainage improvements, and several utility relocations. The project bid with an innovative A+B bidding method to encourage rapid construction to minimize impacts to Pine Creek High School which sits on the Northeast quadrant of the interchange.

  • Design incorporated interim and ultimate Powers Blvd. configurations to allow for future widenings
  • Utility relocations included the design and plans for a 16” water line and a 12” sanitary sewer line for Colorado Springs Utilities (CSU)