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

Willet Population Trend in Delaware

All statesShorebirds

Willet in Delaware has edged up: up 15% on the route-weighted index since 1968.

+15%Since 1968
9Routes In State
57Years

Notable Willet Trends in Delaware

No notable trend signals for Willet in Delaware. See the full index history below.

Willet Population Forecast in Delaware

If the recent trend holds, Willet in Delaware is projected to rise about 15% by 2029 — from 3.0 in 2024 to a central estimate of 3.5 (95% range 0.00–10). A 5-year backtest shows a typical error of ±18.6%, with 100% of held-out values landing inside the 95% band.

+15%Change by 2029
3.5Projected 2029 index
0.00–1095% range
±18.6%Backtest error
19662029
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
20253.70.0011
20263.60.0010
20273.60.0010
20283.50.0010
20293.50.0010

Willet Survey Routes in Delaware

Routes recording Willet in Delaware.
Bethany Bch8419901966
Milton1819751971
Harrington1420241966
Lowes Xrds819911967
Blackbird320231995
Dover219791968
Pepperbox220161998
Georgetown220221992
Pepperbox 2120242017

Willet Population Trend in Other States

alabamacaliforniacoloradoconnecticutfloridaidaholouisianamainemarylandmassachusettsminnesotamontananebraskanevadanew-jerseynew-yorknorth-carolinanorth-dakotaoregonsouth-carolinasouth-dakotatexasutahvirginiawyoming

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