BirdAnalyst
Species · Idaho · BBS 2026 Release · 1966–2025

Long-billed Curlew Population Trend in Idaho

All statesShorebirds

Long-billed Curlew in Idaho has edged up: up 18% on the route-weighted index since 1972.

+18%Since 1972TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
38Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Long-billed Curlew Trends in IdahoNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Long-billed Curlew in Idaho. See the full index history below.

Long-billed Curlew Population Forecast in Idaho

If the recent trend holds, Long-billed Curlew in Idaho is projected to rise about 97% by 2030 — from 0.89 in 2025 to a central estimate of 1.7 (95% range 0.25–3.2). A 5-year backtest shows a typical error of ±71.8%, with 100% of held-out values landing inside the 95% band.

+97%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
1.7Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.25–3.295% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±71.8%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Long-billed Curlew in Idaho is projected to rise about 97% by 2030 — from 0.89 in 2025 to a central estimate of 1.7 (95% range 0.25–3.2). A 5-year backtest shows a typical error of ±71.8%, with 100% of held-out values landing inside the 95% band.19692030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20261.70.213.2
20271.70.223.2
20281.70.233.2
20291.70.243.2
20301.70.253.2

Long-billed Curlew Survey Routes in Idaho

Routes recording Long-billed Curlew in Idaho.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Dubois1220251972
Leadore920241977
Glenns Ferry819861985
Sawtooth Cty820141988
Hot Spring720251990
Sawtooth City 2620252015
Tractor Flat520231989
Pocatello519941987
Iron Springs520241988
Picabo420181988
Baker320212017
Cabarton320142008
Kyle Canyon220232002
Cascade219841984
Craters219881986
Triangle220092005
Acequia220121979
Carey220251989
Bates220231988
Preston219941994
Mora220252018
Blackft Res120181988
Naples120051997
Lost River120162016
Cape Horn120152007

Long-billed Curlew Population Trend in Other States

californiacoloradokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.