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In November 2009, King County voters approved the Open Space Protection Amendment to the King County Charter by more than 80%, which ensured that certain King County-owned properties listed on a “High Conservation Value Property Inventory” would receive a higher level of protection against changes of use or surplus.

Properties on the inventory were acquired “to conserve, preserve, protect or enhance natural or scenic resources”, such as timberlands, streams, wetlands, wildlife habitat, or scenic vistas, and for “passive recreational opportunities”, such as areas for hiking, biking, and/or equestrian uses.

The King County Council can add or remove properties from the adopted inventory only by a supermajority of seven affirmative votes out of the nine council members. King County Council originally approved the ballot measure and inventory as Ordinances 16600 and 16601, which amended King County Charter Section 897 and Title 26 of the King County Code once implemented.

In 2015, the King County Council adopted the first update to the High Conservation Value Property Inventory as Ordinance 18177, adding 3,090 acres in fee and 845 acres in easement to the list of protected lands and making technical corrections to the inventory.

The updated High Conservation Value Property Inventory includes 105 sites, with a total acreage of 16,503 acres in fee and 142,623 acres in easement. Parks is responsible for managing 104 of the sites (some have Transfer of Development Rights (TDR) property interests) and one is solely in the Transfer of Development Rights inventory (Girl Scout Camp).

Press release: County Council approves adding more land to King County’s “Green Curtain”. November 23, 2015.