Located on Route 101 in Del Norte County, 10 miles south of Crescent City, Last Chance Grade is an area of highway prone to geological activity. A 2000 geological study conducted by the California Geological Survey mapped over 200 active slides within the corridor area. Caltrans has performed both maintenance and construction activities on Route 101 designed to keep this vital route connecting Del Norte County with parts south.
Engineered Feasibility Study
A Caltrans engineered feasibility study for Last Chance Grade is currently underway. The study is a detailed investigation that considers a full range of needs, options, ideas, opportunities, and constraints. “We are excited to have an opportunity to take a closer look at this section of Route 101,” said Brad Mettam, District 1 Deputy District Director for Planning and Local Assistance. “We look forward to receiving public input and ideas as the study progresses. The Last Chance Grade corridor area has over 200 active slides according to a geological study from 2000. We are looking to discover creative solutions for this portion of highway.” Once completed, the engineered feasibility study will be used as a reference document identifying potential improvement projects, enabling Caltrans to respond to and compete for various project funding sources as they become available.
Soldier Pile Wall
This Emergency Opening project located near post mile 15.3 is designed to slow the movement of a slipout within the larger Last Chance Grade slide complex, to protect an existing wall completed in 2010 from further damage, and to reduce the frequency of repairs and delays to the traveling public. This $4.8 million (budgeted) project was completed in November 2013. The project included drilling 27 piles at a maximum depth of 80 feet for a soldier pile ground anchor wall, reconstructing portions of the roadway surface, and repairing drainage facilities damaged by the slipout. The contractor working on the Emergency Opening project was CalEx Engineering Company.
An Emergency Soil Nail project at post mile 15.0 was completed in spring 2012.
A project to repair two slipouts at post mile 15.1. As of result the March 2011 Federally Declared Storm Event, a slipout occurred that resulted in the failure of a portion of roadway shoulder, and loss of embankment fill below the roadway. The repair at this location will likely consist of construction of a soil nail wall. Construction is planned for summer 2016.
A project to restore shoulder width using a soldier pile tie-back wall at post mile 15.0. The location of this project is the same location where a soil nail wall was constructed to prevent loss of the roadway in 2012. The purpose of this project is to regain roadway shoulder width that was lost during the March 2012 storms. This will be accomplished through construction of a Soldier Pile Ground Anchor Wall in front of the soil nail wall that was constructed in 2012. Construction is planned for 2017.
- Project Study Report/Project Report: Wilson Creek Safety Project, 2008 (PDF 6.5 MB)
- Supplemental Project Study Report: Last Chance Grade, 2003 (PDF 16.3 MB)
- Value Analysis Report: SR 101 Roadway Stabilization, 2002 (PDF 4.7 MB)
- California Geological Survey Report, 2000 (PDF 1.75 MB)
- Project Study Report: Stabilize Roadway, 1995 (PDF 4.5 MB)
- US Route 101 in Del Norte County: A Corrdior Study, 1993 (PDF 10.0 MB)
- Project Study Report: Wilson Creek Bluffs Bypass, 1987 (PDF 400KB)
For more information, contact:
Last Chance Grade Project Team
Phone: (707) 445-6465, TTY 711
Public Information (Media Inquiries)
Phone: (707) 441-3998, TTY 711