North Mountain Geohazards SOQ

RELEVANT PROJECT EXPERIENCE

NMDOT District 5 (D5) Rockfall Study, Northwest, New Mexico WSP is conducting a rockfall study which includes office and field work to characterize rock fall hazards along 12 highway corridors in northwest New Mex ico. Our team inventoried nearly 200 rockfall sites and rated the hazard with a three-tier ranking system. High-level conceptual cost estimates were developed for 79 of the highest hazard sites. Wilson provided an environmen tal screening of the sites to aid in the assessment of mitigation op tions and provided drone flights of selected sites for generating 3D models. WSP developed a custom database to manage the data using ArcGIS Online and SharePoint. The management and use of this data is a true geotechnical asset management problem and will be used by NMDOT D5 for planning purpos es to prioritize fixing these cor ridors to improve safety, reduce maintenance costs and maintain mobility. WSP met the schedule and budget on this project.

State Highway (SH) 133 Corridor Study and Mitigation Design, Colorado The Colorado SH 133 Corridor is severely impacted by rock fall, debris flows, landslides, avalanches, and the occasional sinkhole. WSP conducted a cor ridor study that involved inven torying 300 geohazard sites and performing quantitative risk assessment on 125 of them. Conceptual mitigation options with preliminary cost estimates were prepared for 50 of the highest risk sites, allowing for benefit-cost ratios to be comput ed. Based on the findings, five mitigation projects were un dertaken, primarily designed by WSP, representing New Mexico Department of Transportation (NMDOT) sites that have been mitigated, are under construc tion, or are under design. When these projects are completed, they will ultimately result in an approximate $18.5 million reduc tion in risk exposure compared to $16.8 million in construction costs. WSP met the schedule and budget on this project.

Interstate 70 Glenwood Canyon Debris Flow Mitigation, Garfield County, Colorado

During the Grizzly Creek fire in 2020 that burned through Glenwood Canyon, significant storms in the summer of 2021 caused major debris flows that caused damage to Interstate 70, closed the freeway for weeks, and exposed additional risks to highway infrastructure. WSP evaluated the debris flow hazard to viaduct piers and spans and provided preliminary mitigation designs. The team designed debris flow fences and micropile pier protection structures as well as gabion walls to protect road way infrastructure. WSP coordi nated plans and specifications packages for this emergency project and provided trouble shooting and support to CDOT during the construction phase.

Client: Colorado Department of Transportation (CDOT)

Client: Minnesota Department of Transportation (NMDOT)

Client: Colorado Department of Transportation (CDOT)

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North Mountain Geohazards