Cheyenne, WA

Cheyenne Water Distribution System


The water distribution system in Cheyenne includes four prestressed concrete cylinder pipelines (PCCP), approximately 13.5 mi long. The 16 to 30 in. dia., lined-cylinder pipes (LCP) were installed between 1950 and 1962. Three of the PCCP carry raw and treated water, and the fourth is a part of the distribution system. SGH assessed the condition of all four lines while they remained in service.

Highlights of SGH’s work include the following:

  • Data collection and review of historical records
  • Corrosion survey including electromagnetic conductivity testing
  • Geotechnical and groundwater investigations
  • External test-pit inspection of pipe
  • Testing of mortar coating and prestressing wire samples
  • Hydraulic transient analysis
  • Structural evaluation of LCP
  • Failure risk analysis of pipe assuming broken prestressing wires and corroded steel cylinder

We found that the lines had performed well, and there were no systematic factors that presented a significant risk of future failure.

Project Summary



Completion Date
Repair & Rehabilitation
Advanced Analysis | Applied Science & Research
Infrastructure & Transportation
Cheyenne Board of Public Utilities
Specialized Capabilities
Buried Infrastructure | Risk & Resilience Assessment | Materials Science

Key team members

Rasko Ojdrovic
Rasko Ojdrovic
Senior Principal
Mehdi Zarghamee
Mehdi Zarghamee
Senior Principal