I-25 and CO 21 (Powers Blvd) Water Quality Project

About the Project

The I-25 and CO 21 (Powers Boulevard) Water Quality project will install a new storm sewer system to drain the I-25 and Powers Boulevard interchange, which is currently under construction by another contractor team. CDOT and Redline Pipeline will install storm sewer pipes and build two permanent combined water quality and detention pond facilities. Pond A is immediately adjacent to the east side northbound I-25. Pond B is located in the center median adjacent to southbound I-25.

The contractor is also responsible for trench excavation and backfill required for installing the new storm sewer system. Work requires close coordination with the interchange project team since project phases and work areas overlap. Project completion is anticipated in summer 2021.

This project is located within the current interchange work area on and adjacent to I-25 south of North Gate Boulevard (Mile points 154 – 156). More information on the I-25 and Powers Boulevard interchange design and construction can be found at

Project Facts

  • Cost: $6.6 million
  • Contractor:  Redline Pipieline
  • Timeline: May 2020 - September 2021
  • Location: I-25 south of North Gate Boulevard, new Powers Boulevard interchange

drainage under new Northgate ramp

Drainage under new Northgate ramp bridge.

Proposed Work Schedule

  • Construct Pond A - Spring - Summer 2020
  • Construct Pond B - Winter - Spring 2021
  • Storm sewer pipe work - on-going

Traffic Impacts

  • Project traffic impacts are included under the I-25 / Powers Boulevard interchange project weekly report.
  • Visit for the latest weekly travel impact information.

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