Field Testing and Long Term Monitoring of Selected High Mast Lighting Towers

In 2013, Wyoming Department of Transportation (WYDOT) Projects B139025 and B133026 installed a combined 21 high-mast light towers (HMLT) in District 1 and District 3. The HMLTs were fabricated by Valmont Industries, according to WYDOT Standard Plan and were installed by Modern Electric of Casper, WY. In May 2016, after only three years of service, inspectors discovered fatigue cracks on two HMLTs located at the Wagonhound Rest area of I-80 near Exit 267. One of the HMLTs was missing a luminaire. Further inspection revealed that one more HMLT had significant fatigue damage too. Weather data collected by a nearby weather station was reviewed by WYDOT officials showing high winds, rain and freezing temperatures. The cause of the fatigue cracks cannot be determined at this time. This project will monitor four HMLT at locations designed by WYDOT officials in order to determine the cause of severe fatigue damage in the pole to base plate weld observed in the three HMLTs. The outcome of this research is intended to determine what accelerated the fatigue failure of the HMLTs enabling WYDOT to take corrective actions on existing and future HMLT installations in order to ensure the public safety.


  • English


  • Status: Active
  • Contract Numbers:


  • Sponsor Organizations:

    Wyoming Department of Transportation

    5300 Bishop Blvd.
    Cheyenne, WY  United States  82009-3340
  • Project Managers:

    Cortez, Paul

  • Performing Organizations:

    Purdue University

    1040 South River Road
    West Lafayette, IN  United States  47907
  • Principal Investigators:

    Connor, Robert

    Lloyd, Jason

  • Start Date: 20170314
  • Expected Completion Date: 20190331
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01650165
  • Record Type: Research project
  • Source Agency: Wyoming Department of Transportation
  • Contract Numbers: RS07217
  • Files: RiP, STATEDOT
  • Created Date: Oct 28 2015 2:36PM