The Swainson's hawk (Buteo swainsoni) is a medium-sized buteo. It was listed as threatened in 1983 by the California Fish and Game Commission due to habitat loss and decreased numbers across the state. It breeds in the western United States, often nesting within agricultural areas or along roadways. Caltrans works with CDFW on adaptive management to avoid and minimize adverse effects to Swainson’s hawk when incidental take is authorized. Observations of nesting from several projects constructed from 2018-2023 show this species can be tolerant of disturbance when nesting. In Solano County, Swainson’s hawk nested and successfully fledged near both the Midway Rd. and McCune Creek bridges along Interstate Route 80 within 60 and 140 ft of each construction site, respectively. In Napa County, a large intersection improvement project adjacent to two active nests delayed starting, then worked through the subsequent nesting season where a nest 35 ft from the roadway and 100 ft from active construction was successful, but another nest 700 ft away on private property was harassed by red-tail hawk and did not produce offspring. Ongoing efforts seek to understand disturbance thresholds and behavior patterns of Swainson’s hawk breeding pairs nesting adjacent to transportation infrastructure.