City of Seattle, Seattle Public Utilities, Goshawk Nesting 1992 - Current, Cedar River Municipal Watershed and South Fork Tolt River Municipal Watershed, King County, WA

This data package contains American goshawk (Astur atricapillus) (formally known as Northern Goshawk [Accipiter gentilis]) survey data and nest location records, beginning in 1992 to present day, from the Cedar River Municipal Watershed and the South Fork Tolt River Municipal Watershed in King County, Washington, USA. Goshawks are classified as a sensitive species and are included in the Habitat Conservation Plan for the Cedar River Municipal Watershed.

Surveys have been conducted periodically at historical nesting territories, depending on staff capacity and the potential for disturbances from planned infrastructure projects or forest thinning operations. These surveys were not based on a statistically valid random sampling design and did not always strictly follow established protocols.

Survey methods primarily included broadcast surveys using a portable cassette player and megaphone but also involved active searches for nests or signs, as well as opportunistic detections during other forest management activities. At some nest sites, plot-level forest structure and characteristics were also documented.

Nest productivity monitoring was generally not conducted, as the primary objective of the surveys was to minimize disturbance and prevent inadvertent destruction of nests.