San Juan County Vessel Drift Analysis Response - Presentation

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Vessel Drift and Response Analysis for the 
Strait of Juan de Fuca to the Southern 
Strait of Georgia
Islands Trust Council Meeting 
September 22, 2021

Project 
Team
Marta Green
Puget Sound Recovery 
Coordinator, Project Manager
Tim Robertson,Principal
BretwoodHigman, Analyst
Sierra Fletcher, Operations Manager
TarangKhangaonkar, Director
SukyongYun,Associate Research Scientist

Project 
Contributors*
Fred Felleman(WAVE Consulting)
Brian Kirk (Washington Dept. of Ecology)
Paul McCollum (Port Gamble S'KallamTribe)
Lovel Pratt (Friends of the San Juans, San Juan County 
Marine Resources Committee)
Jennifer Steele (Clear Seas Centre for Responsible 
Marine Shipping)
Jamie Stephens (San Juan County)
KimbalSundberg (San Juan County Clean Water 
Advisory Committee)
John Veentjer(Marine Exchange of Puget Sound)
*Appreciation, influence, but not necessarily 
concurrence

Agenda
1.Background
2.Project Objectives
3.Research Question 1 –Drift Time to Grounding
4.Data Sources
5.Limitations
6.Results –Time to Grounding Maps
7.Research Question 2 –ERTV Response Time Analysis 
8.Findings
9.Questions and Discussion of Next Steps

Background
•Investment in an emergency response towing vessel (ERTV) to 
reduce the risk of an oil spill has transboundary support
COMPLETED JAN 2019
•May 2018: Islands Trust and San Juan County jointly requested 
Transport Canada to position an ERTV in Sidney
•Sept 2016: ERTV for HaroStrait 
and Boundary Pass was ranked 
a priority risk mitigation 
measure at Dept of Ecology 
Spill Risk Mitigation Workshop 
–needing cost/benefit 
business model

•2018: SB 6267
Owners of operators of covered vessels transiting to or from WA port to establish 
fund for an ERTV (did not pass) 
•2019: HB 1578 Sponsored by Rep. Lekanoff
Requires Dept of Ecology to develop a model and quantitatively assess whether an 
ERTV serving HaroStrait, Boundary Pass, Rosario Strait, and connected navigable 
waterways will reduce oil spill risk by Sept 1, 2023 (adopted Mar 7, 2019)
•Nov 2019: Orca Task Force Recommendation 24
•Questions remained on whether or not an ERTV could be 
effective in responding to incidents in these narrow waterways
Background

•To inform discussions and decisions on vessel traffic safety and 
oil spill risk mitigation measures in the Salish Sea.
•Apply methods and model developed by Nuka Research and 
Planning Group, LLC for Canada’s west coast extended to 
inland waters.
•To analyze the time available to rescue a disabled vessel adrift 
in the inland waters extending from the Strait of Juan de Fuca 
to Burrard Inlet before it grounds, and the time that it would 
take for an emergency response towing vessel (ERTV) to 
rescue ships adrift on the north and west sides of the County, 
thus reducing the risk of an oil spill.
Project Objectives

Research Question 1 
1. For any given location, how much time would be available for 
an ERTV to arrive at a disabled ship before it may drift aground 
when considering wind and currents?

Study Area

Mod

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