The goal of the survey efforts from 2020 to 2024 was to assess the population status, banding status, breeding status, and habitat attributes of the flycatcher population along the upper San Luis Rey River, in an area downstream from Lake Henshaw, where demographic monitoring occurred from 2015 to 2019 as well as the habitat surrounding Lake Henshaw. The reports contain the annual updates to surveys completed since 2015. In 2024, the efforts also were to (1) assess the flycatcher populations at select locations in San Diego County, including two along the middle San Luis Rey River near Bonsall and four along the upper San Luis Rey River near Santa Ysabel; (2) assess the breeding activities of the flycatcher at Lake Henshaw, including nest success and productivity; and (3) evaluate the level of cowbird parasitism at Lake Henshaw.