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Flight Corridor Safety Program: Tree Obstruction Analysis Overview and Removal Summary

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This draft document, updated October 2019, summarizes an obstruction removal study conducted near Seattle-Tacoma International Airport, identifying 174 trees that penetrate or are predicted to penetrate FAA-required airspace surfaces. The trees are distributed across multiple property owners, with WSDOT holding the largest share (102), followed by Highline School District (26), private owners (19), SeaTac (21), and the Port (6). The study, which involved LIDAR scanning, FAA-approved analysis, and field verification, classifies the obstructions as topped, existing, or potential future penetrations, with conifers making up the vast majority of affected trees.

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Draft presentation dated October 22, 2019, summarizing the Sea-Tac Airport Flight Corridor Safety Program (FCSP) tree obstruction analysis. Documents 174 total obstructions by owner: WSDOT (102), Highline School District (26), SeaTac (21), Private (19), Port of Seattle/POS (6). Categorizes trees as topped (10), existing penetrations (14), and predicted penetrations within 5 years (150). Species breakdown: 157 conifers, 17 hardwoods. Obstruction removal summary by jurisdiction: WSDOT ROW for SR 509 extension (104), City of SeaTac public including Highline School District property (46), City of SeaTac private including Hillgrove Cemetery (10), City of Burien private residential (7), City of Des Moines (1), Port of Seattle including wetland and wetland buffer (6). LIDAR study by Quantum Spatial (August 2018), QA/QC by Landrum and Brown (June 2019), field verification by Anchor (July 2019), legal review of compensation options (September 2019), WSDOT property boundary finalized (October 2019).

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