BirdAnalyst
Species · Washington · BBS 2025 Release · 1966–2024

Willow Flycatcher Population Trend in Washington

All statesAerial insectivores

Willow Flycatcher in Washington has fallen sharply: down 65% on the route-weighted index since 1970.

-65%Since 1970
93Routes In State
56Years

Notable Willow Flycatcher Trends in Washington

long arc declinecomputed index

Willow Flycatcher has fallen sharply in Washington: down 65% on the route-weighted index since 1970.

Willow Flycatcher Population Forecast in Washington

If the recent trend holds, Willow Flycatcher in Washington is projected to fall about 43% by 2029 — from 5.5 in 2024 to a central estimate of 3.1 (95% range 0.00–7.0). A 5-year backtest shows a typical error of ±39%, with 100% of held-out values landing inside the 95% band.

-43%Change by 2029
3.1Projected 2029 index
0.00–7.095% range
±39%Backtest error
19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20253.60.007.5
20263.50.007.4
20273.40.007.3
20283.30.007.1
20293.10.007.0

Willow Flycatcher Survey Routes in Washington

Routes recording Willow Flycatcher in Washington.
Mendota 34620242005
Issaquah3619871969
Mendota 23220001989
Montesand3120241986
Kendall2520241981
Mendota2519881977
South Elma2420241975
Everett2320241975
Raymond1920211993
Mcchord1920151996
Index1819711968
Carnation1620241988
Port Angeles1520241970
Rainier1520191993
Newhalem1220241968
Cougar1220231982
Hurricane Rg1220241995
Cedar Falls1220141992
Waitsburg1220041994
Mukilteo1120241993
Deer Park1020151994
Raymond 21020242022
Mt St Helens920241992
Turnbull Nwr820231993
Warm Beach720171968

Willow Flycatcher Population Trend in Other States

alaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.