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Open Space Conservancy Trust

The Mercer Island Open Space Conservancy Trust is a board of volunteer citizens appointed by the Mayor and approved by a majority of the City Council to oversee open space properties placed in the trust as passive, low-impact recreational open space (park).  The Trust manages these properties to protect, maintain and preserve them as natural, scenic and recreational resources, maintaining all their ecological, scenic, aesthetic, scientific, and educational attributes for the current and future residents of Mercer Island in perpetuity.

The Trust was established by ordinance on February 10, 1992 (amended May 6, 1996). Open space is defined by the ordinance as a property of potential natural or scenic resources that has been reserved by the Mercer Island City Council for passive and low impact forms of use, such as walking, jogging, and picnicking.  Currently the Trust owns and oversees the management of Pioneer Park and Engstrom Open Space.

The seven members meet as needed (usually every other month starting in January). Click here to download the Trust's bylaws.  The Trust is staffed by the Parks and Recreation Department.

The Open Space Conservancy Trust plays an instrumental role in partnership with the Parks and Recreation Department to create, coordinate and implement letterboxing. Click here to learn more about letterboxing.

Additional Information

Staff Contact: Alaine Sommargren, Natural Resources Manager at 206-275-7879 or

Length of Term
3rd Thursday of Jan, Mar, May, Jul, Sep, & Nov at 6:00 pm in the Council Chambers at City Hall
Four years running, June 1 - May 31

Email Address
Term Begin
Term End
Lisa Anderl   Councilmember   01/31/2020   12/31/2020  
Marie Bender   Trustee   11/07/2016   05/31/2021  
Carol Lynn Berseth   Trustee   06/05/2018   05/31/2022  
Hillary Ethe   Trustee   06/02/2020   05/31/2024  
Thomas Hildebrandt   Secretary   06/02/2020   05/31/2022  
Craig Olson   Trustee   06/02/2020   05/31/2024  
Geraldine Poor   Trustee   01/17/2012   05/31/2021  

Calendar Events

*Canceled* Open Space Conservancy Trust Board Meeting
Thursday, July 16, 2020
Notice is hereby given that the July 16, 2020 Open Space Conservancy Trust Board meeting is canceled. The next regular meeting is scheduled for September 17 at 6 PM.

Open Space Conservancy Trust Board regular meetings are held on the third Thursday of alternatin...  (Read more)

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