Pedestrian Bridge Monitoring

Case Studies

SCOPE:  Deliver a unique hardware and software monitoring solution for the transition of land from old Railroad grounds to a jogging, walking, inline skating, and bicycling path.



Specto Technology supplied state-of-the-art monitoring products including crackmeters, tiltmeters, wireless dataloggers and ARGUS software for implementation in the field.



  • The Katy Trail is a jogging, walking, inline skating, and bicycling path that runs through the Uptown and Oak Lawn areas of Dallas, Texas, following the path of the old Missouri-Kansas-Texas Railroad, which was known as MKT or the Katy.
  • The construction work to convert the unused 3.5 miles railway track into a hiking trail took place between 2000 and 2007.
  • Since completion, it has been expanded several times and is currently on final extension phase (Phase VI).
  • The Phase VI is 0.65 miles long, includes 2 pedestrian bridges and the estimated cost is $14.1 million.
  • Phase VI construction started in October 2015 and was completed in January 2018.


  • Unique engineering designs and monitoring for the project is required due to the fact that one of the bridge (over Mockingbird Lane) sits atop a Dallas Area Rapid Transit (DART) tunnel.
  • A cantilevered suspension bridge design had to be utilized to push the bridge foundation away from the tunnel.



The instrumentation and monitoring scheme, designed and carried out by HNTB and Rebcon Inc., respectively,  consists of the following instruments, dataloggers and software:

VW Crackmeters

  • 20 x crackmeters are installed inside the DART tunnel
  • These monitor cracks in the tunnel lining

MEMS Tiltmeters

  • 11 x tiltmeters are installed on retaining structures
  • They monitor the rotation of the retaining structure

LS-G6 Wireless Data Acquisition System

  • The LS-G6 system, by Loadsensing, was selected due to its long range radio, low power consumption, easy implementation and because it’s capable of working inside the tunnel
  • The system consists of one gateway, 11 x nodes for the MEMS tiltmeters and 5 x nodes for the VW crackmeters
  • The system collects readings automatically and wirelessly from the crackmeters and the tiltmeters

Deformation Monitoring Points

  • 92 x prisms were installed in and outside the DART tunnel
  • These are monitored by manual, optical survey

ARGUS Software

  • ARGUS was selected for its ability to simply display data online in real time
  • The software is used for web based management and reporting of data from all automated instruments and from manual optical survey points

How we work with you to make your life easier

Specto Technology provides unique, powerful hardware and software for wireless Geotechnical, Structural and Environmental monitoring. We offer Aeroqual, Sonitus, Instantel, and Topcon products to make your life easier.

Our Methodology - How We Work With You

Step 1


We begin by learning details of your projects, including timeframe, regulations, potential issues, budget and other requirements

Step 2


Once we understand your needs, we develop a complete, turnkey solution with hardware and software that will not onlu meet, but exceed your requirements, keeping both the budget and timeframe in mind.

Step 3


We support you every step of the way, providing hands-on equipment and software training for your team to ensure that your monitoring program is successful

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For Sales, Rentals and Quotes, please contact us by filling out the form below. Our knowledgeable staff are ready and eager to assist you!

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