Please note: You will receive an invoice which includes instructions for payment. Payments must be received at least two weeks prior to the class date to secure your registration. Cancellations must also be received at least two weeks prior to be eligible for a refund.

POSTPONED-How to Determine the Ordinary High Water Mark

  • Wednesday, May 13, 2020
  • 9:00 AM (PDT)
  • Thursday, May 14, 2020
  • 4:00 PM (PDT)
  • Padilla Bay Reserve, Mount Vernon
  • 15


Registration is closed

This training provides information and methods for determining the ordinary high water mark (OHWM) as defined in the state Shoreline Management Act (SMA).  Waters regulated under the SMA include all tidal waters, streams greater than 20 cubic feet per second mean annual flow, water bodies greater than 20 acres in size and any associated wetlands and deltas.  Field visits to each of the SMA water types will give you the opportunity to apply the methods discussed in the classroom.        


In this training, you will learn answers to these questions:      

- How is the OHWM defined and where does it apply?

- What is the regulatory context and history of the OHWM?

- Why it is important to use field indicators to determine the OHWM?

- What are the most reliable field indicators on tidal waters, streams, lakes and associated wetlands?

- What are some common misconceptions about OHWM determinations?

(12 AICP CM Credits / CEP Points)


Lunch is provided.




Zach Meyer is a Wetlands/Shorelands Specialist with the WA State Department of Ecology. In the last few years with Ecology, Zach has been involved in environmental planning, permitting, and providing technical assistance to local jurisdictions.  Zach’s educational background includes a Master’s degree in Marine and Environmental Affairs from the University of Washington, and undergraduate studies in anthropology and biology from Indiana University. 

Rebecca Rothwell has a BS in biology from the University of Puget Sound (2002) and a master’s of environmental studies from The Evergreen State College (2010). She has worked for Ecology since 2008, doing wetland mitigation compliance, wetland and shoreland permitting, assistance with CAO and SMP updates, OHWM determinations, and technical assistance with local governments.


Lynn Schmidt is the Department of Ecology’s Statewide Flood Engineer, focusing on reducing flood risks to communities while enhancing natural floodplain functions. Her career has spanned a wide range of topics within the environmental and hydraulics engineering fields, including hydraulic modeling, river restoration, floodplain management, stormwater management, environmental investigations, and monitoring. Lynn holds a BS in Civil Engineering, MS in Environmental Engineering, and is a Professional Engineer and Certified Floodplain Manager.


Washington State Department of Ecology 


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