Magruder Road Slide Repair

AESI provided geotechnical evaluation and design for a landslide repair on Magruder Road, one of the only roads through a wilderness area in the United States, located in the Frank Church River of No Return Wilderness in the Bitterroot National Forest in Idaho. AESI’s scope of work included the following:

1. Review previous work including geotechnical investigation and design plans by prior consulting engineers.
2. Field reconnaissance to the site in the company of USFS Engineers to review site conditions and to further conceptualize the design and required scope of work.
3. Conduct geotechnical explorations including the following:

• Hollow stem auger drilling with sampling by standard penetration test (STP).
• Topographic survey of the site.
• Laboratory soils testing.
• Analysis and design of several alternative retaining wall concepts.

4. Work with USFS Engineers to develop retaining wall design alternatives to stabilize and drain the site and comply with desired USFS standards for road geometry.
5. Cost analysis and applicability discussion of each retaining wall alternative.
6. Preparation of plans, Forest Service Supplemental Specifications, and cost estimate.
7. Assist with engineering construction support as needed by the USFS.