Project Details:

During the 10-day deluge of rain in March of 2011 an existing landslide on Hwy 299 in Trinity County California reactivated and exhibited accelerated movement of up to 3-inches a day.  CalTrans District 2 Maintenance Engineer, Lance Brown, PE, staff asked LSI to review the slide and within hours LSI’s technical team had a design and cost estimate ready for CalTrans review.  Within days after receiving a formal notice to proceed LSI mobilized to the slide and started the repair process.

As-built records as far back as 1983 indicated that CalTrans had been challenged by a fairly deep seated landslide on Hwy 299 in Trinity County California at mile 49.1.  Initial efforts to stabilize the slide included the installation of a stab drainage trench at the uphill edge of road and several horizontal drains.  At some point in time between 1983 and 2011 the road was widened and a third passing lane was added.  Until LSI’s involvement local maintenance crews continued to struggle with the slide and were forced to maintain the travel way with regular repaving efforts.


LSI’s repair design included a sophisticated combination of Self Drilling SuperNails™ with Self Drilling SuperMicroPiles™ and the road was open throughout the entire of construction process.  According to CalTrans LSI’s system saved the agency over half the cost when compared to traditional landslide repair techniques.

Project Summary:

Hwy 299 Curly Curve, CalTrans District 2

During the 10-day deluge of rain in March of 2011 an existing landslide on Hwy 299 in Trinity County California reactivated and exhibited accelerated movement of up to 3-inches a day.


Project Stats:

  • Emergency Landslide Repair
  • Saved CalTrans over 50%
  • Northern California
  • CalTrans District 2
  • Self Drilling SuperNails™
  • Self Drilling SuperMicroPiles™
  • Designed within hours
  • Mobilized within days

Project References:

  • CalTrans District 2, Maintenance Department
  • ELB Prime Contractor, Stewart Engineering, Inc.
  • Cameron Lobato, P.E., Project Engineer, Landslide Solutions, Inc., cameron@landslidesolutions.com
  • James Chinchiolo, CEO, Project Manager,  Landslide Solutions, Inc., james@landslidesolutions.com

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