BirdAnalyst
Species · BCR 10 · BBS 2026 Release · 1966–2025

Long-billed Curlew In Northern Rockies

All regionsNorthern RockiesShorebirds

Long-billed Curlew in Northern Rockies has increased: up 48% on the route-weighted index since 1970.

+48%Since 1970TrendPercent 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 →
80Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Northern Rockies. See the full index history below.

Long-billed Curlew In Northern Rockies Population Forecast

If the recent trend holds, Long-billed Curlew in Northern Rockies is projected to rise about 39% by 2030 — from 0.84 in 2025 to a central estimate of 1.2 (95% range 0.60–1.8). A 5-year backtest shows a typical error of ±13.2%, with 100% of held-out values landing inside the 95% band.

+39%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 →
1.2Projected 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 →
0.60–1.895% 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 →
±13.2%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 Northern Rockies is projected to rise about 39% by 2030 — from 0.84 in 2025 to a central estimate of 1.2 (95% range 0.60–1.8). A 5-year backtest shows a typical error of ±13.2%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20261.20.591.7
20271.20.591.7
20281.20.601.7
20291.20.601.8
20301.20.601.8

Routes In Northern Rockies

Routes recording Long-billed Curlew in Northern Rockies.
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 →
Big SandyWYOMING342024
Red RockMONTANA292023
BoulderMONTANA262024
GlenMONTANA202025
Heart ButteMONTANA172025
Church HillMONTANA132025
RandolphUTAH92024
Sawtooth CtyIDAHO82014
AugustaMONTANA82025
RaynesfordMONTANA82025
Muddy CreekMONTANA82015
Pryor Mtn.MONTANA82025
Sawtooth City 2IDAHO62025
BeaverheadMONTANA52025
Wolf CreekMONTANA52025
Fort LoganMONTANA52025
Mtn ViewWYOMING51983
Pablo Res.MONTANA42017
LimaMONTANA42025
Brunzell SloughMONTANA42025
Soda LakeWYOMING42025
RyegrassWYOMING42025
CabartonIDAHO32014
PolsonMONTANA32025
Freeman CreekMONTANA32016

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