Thurston County reviews environmental, cultural resource policies in comprehensive plan update

Ashley Orion, a member of Thurston County’s planning team, presented the board with draft environmental and cultural resources chapters of the county’s comprehensive plan during the Board of County Commissioners work session on Aug. 20, 2025. Orion said the presentation is “the fifth in a series of seven” in the comprehensive plan update and reviewed new local studies and state guidance that will shape policy and code updates.

The draft chapters summarize existing assets and new data: Orion reported about 2,600 acres of parkland countywide, 56 miles of trails, more than 128 miles of marine shoreline and a tree‑canopy assessment showing 61% canopy coverage. Planning staff also said roughly 8% of the rural unincorporated county lies in the 100‑year floodplain and that about 1,300 cultural resources are recorded across jurisdictions.

Planning staff told the board they expect major impacts to environmental and cultural resources over the next 20 years and that the climate chapter will cross‑cut many of the policies under consideration. New or updated studies the team is incorporating include a countywide tree canopy assessment, a hazard mitigation plan and an update to the county’s flood hazard mitigation plan. Orion also described a habitat‑connectivity map developed with the Washington Department of Fish and Wildlife (WDFW) to identify protected areas, ownership patterns and gaps that could be priorities for conservation acquisitions or easements.

Orion and county staff said the Department of Ecology’s new requirements to monitor tree canopy (linked to municipal stormwater permit conditions) shaped the county’s decision to establish a baseline across the county. The presentation noted coordination with state agencies and local conservation partners, and the planning team cited Conservation Futures as a funding tool to prioritize acquisitions that close habitat gaps.

Public comment themes summarized for the board included water‑conservation policies for rural areas, new tree‑canopy protections, stronger protection for wildlife corridors and additional site investigations to protect cultural resources during development review. Planning staff said those themes helped shape new draft sections and that the county initiated early, ongoing consultation with tribal governments—monthly meetings and early review of drafts—to incorporate tribal feedback before chapters went public.

Board members asked staff how the environmental chapters interrelate with growth and housing questions. Orion and other staff noted a separate, state‑required land‑capacity and housing allocation analysis being completed at the regional level; staff said the county’s analysis shows housing needs can be accommodated in cities and urban growth areas (UGAs) if the county pursues several strategies, and that additional steps will be required to meet state law for housing at all income levels. Planning staff scheduled the housing chapter presentation for Sept. 17 and said the climate chapter would be presented the following week.

The presentation identified a policy tradeoff that the board will need to weigh: several community members have urged limiting rural growth (staff cited public interest in a 5% rural growth target) to protect environmental and cultural resources, while state housing requirements and county housing needs will require actions to accommodate growth. Staff emphasized that the comp plan and implementing development codes will be the mechanisms to reconcile those objectives.

Planning staff closed by offering to provide commissioners with additional numeric detail on population and housing estimates and to supply materials from partner presentations (WDFW, Conservation Northwest) as requested. The board and staff agreed to return to the item in future work sessions for more detailed policy choices and numeric analysis.