San Diego Management & Monitoring Program


Vertebrate Species
Southwestern Willow Flycatcher Status and Demography


Project description

This is a planned 5-Year study. USGS will conduct a 2-phased investigation to: 1) document the abundance and distribution of flycatchers in San Diego County; and 2) collect demographic data that will permit an assessment of the San Luis Rey River population within the larger contexts of MSPA and the state. During phase 1, drainage-wide surveys were conducted from Lake Henshaw downstream to College Boulevard in Oceanside between May and August 2015. These surveys were repeated in 2016, focused on sites outside of the San Luis Rey drainage that have historically supported resident southwestern willow flycatchers, including the Otay, Sweetwater, and San Diego Rivers, Santa Ysabel Creek, and Agua Hedionda. Phase 2 demographic data collection through monitoring started in 2016 and continued through 2017. In 2018, the focus is on monitoring flycatcher pairs in the upper San Luis Rey River study area, and banding and re-sighting color-banded flycatchers. Surveys will also be conducted outside the San Luis Rey drainage.


Project protocol

Name: Southwestern Willow Flycatcher Natural History Summary and Survey Protocol

Description: The primary objective of this protocol is to provide a standardized survey technique to detect Southwestern Willow Flycatchers, determine breeding status, and facilitate consistent and standardized data reporting.

Protocol attachment: SWFL Natural History and Survey Protocol.pdf5MB


Project location

County: San Diego

General: North-central, North-west

MU: 10, 5, 6, 7, 8, 9


Project spatial boundary

View spatial map of this project.

Project focus

Project type: Monitoring

Target species: Southwestern willow flycatcher


Implementing entities

Main implementing entity: U.S. Geological Survey

Point of contact: Barbara Kus

SDMMP lead: Kris Preston


Project funding agreements

Funding participants
Role Participants
funding source Environmental Mitigation Program

Strategic elements

Budget year: FY15-16 Work plan objectives number: 1.2