Public Works Engineering

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Public Works Engineering

County Engineer: Paul A. Randall-Grutter P.E.
Engineering Division Manager: Grace Kane, P.E.
 

Bow Hill Road Reconstruction

Concrete -Sauk Valley Road

Farm to Market Road / Josh Wilson Road Intersection Improvements

Francis Road Reconstruction: Section 1

Garden of Eden Rd/Willard Creek Culvert

2021 HMA Overlay Project

Josh Wilson Road: Phase 1

North Shore Drive Roadway Repair

Sinclair Dock Replacement

Sinclair Island Marine Access

Upper Finney Creek Bridge
(Seismic Retrofit)

North Shore Drive Roadway Repair
Project Number ES01000-1

UPDATES

September 14th:  Executive Work Session 9:00am
You may attend meetings by computer, tablet or smartphone: or by telephone: 1 (253) 215-8782 Meeting ID: 871 8000 1980 Passcode: 143573

Project Description
This project intends to repair and restore this portion of North Shore Drive to the original paved width and stabilize the adjacent lakeside slopes to prevent continued erosion and slope failures.

This section of North Shore Drive is directly adjacent to Lake Cavanaugh.  The portion of the road has been experiencing slope stability issues over many years, but more recently, in 2019, significant failures became evident.  The roadway and adjacent slopes are failing and have been compromised in several locations between Milepost 2.050 and Milepost 2.145; an approximate length of 500-feet.

There are several factors that are attributing to the slope and subgrade failures:

  • Lack of drainage facilities.  This has encouraged seepage and erosion of the roadway subgrade from the hillside;
  • Wave action from increased range of lake level fluctuations have undermined the roadway subgrade from the lake side.
  • Original road construction:  Constructed in the early 1900’s as part of a logging operation.  Materials used for the roadbed, combined with the compaction and construction methods used at the time were intended to facilitate logging operations for a short duration.  The road was not intended to serve as a permanent access for today’s passenger and service vehicles.

  • Maintenance activities and repair efforts have been effective in extending the life of this portion of roadway.    Unfortunately, the severity and size of these failures have exceeded the scope and ability of our Maintenance Department to rectify and repair.

  • Portions of the roadway have been barricaded off and reduced to one travel lane with two-way operation.




Project Timelines
Fall of 2018, Initial Geotechnical investigations were completed.
June 2019, an Engineering Consultant was hired to provide design solution alternatives.  Conceptual design alternatives were presented to Skagit County for internal review and permitting agencies for informal consultation.  The conceptual design proposed did not garner support internally nor from permitting agencies.
Summer 2019, Skagit County Public Works performed maintenance activities to prevent continued slope failures.

2019 to 2020:  Failed areas continued to grow.  Skagit County Public Works continued to provide maintenance activities in order to mitigate and slow the continued failure of the slope and roadway edge, while simultaneously working with another consultant to evaluate the expanded failures and develop appropriate design alternatives.

2020 to present:  Slope and road conditions continued to quickly degrade.  The extent of failures triggered the need for significant revision to the design and it became evident that the extent and scope of repairs had exceeded what was originally programmed.  Revised design alternatives were presented internally, and held another informal consultation with WDFW on 6/24/21.

July 2021:  Skagit County Public Works has gathered enough information and would like to communicate these findings and options to the community and general public via Public Open House to be held in a nearby location.

August 20th, 2021:  Open House at the Lake Cavanaugh Community Hall, 5:30 pm to 6:30 pm.

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September 14, 2021: Work session with the Skagit County Commissioners, 2:00 p.m. - 3:00 p.m. Join the meeting by clicking here.

Funding Sources

  • Not Currently Funded

For more information, contact:
Sonny Andrew – Project Manager
(360)416-1400 / sonnya@co.skagit.wa.us

 


Public Works Engineering

County Engineer:
Paul A. Randall-Grutter P.E.

Engineering Division Manager:
Grace Kane P.E.

1800 Continental Place
Mount Vernon, WA 98273
Phone: (360) 416-1400
Fax: (360) 416-1405

email: pw@co.skagit.wa.us