BirdAnalyst
Species · BCR 16 · BBS 2026 Release · 1966–2025

Long-billed Curlew In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauShorebirds

Long-billed Curlew in Southern Rockies / Colorado Plateau has increased: up 33% on the route-weighted index since 1991.

+33%Since 1991TrendPercent 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 →
12Routes 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 →
33YearsYears 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 Southern Rockies / Colorado Plateau. See the full index history below.

Long-billed Curlew In Southern Rockies / Colorado Plateau Population Forecast

If the recent trend holds, Long-billed Curlew in Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2030, near 0.08 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±392.3%, with 20% of held-out values landing inside the 95% band.

n/aChange 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 →
0.08Projected 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 →
0.00–0.1795% 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 →
±392.3%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 Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2030, near 0.08 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±392.3%, with 20% of held-out values landing inside the 95% band.19882030
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 →
20260.080.000.17
20270.080.000.17
20280.080.000.17
20290.080.000.17
20300.080.000.17

Routes In Southern Rockies / Colorado Plateau

Routes recording Long-billed Curlew in Southern Rockies / Colorado Plateau.
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 →
FruitaCOLORADO21989
MoscaCOLORADO22006
GardnerCOLORADO22003
PecosNEW-MEXICO22015
PasturaNEW-MEXICO22025
Wilson CreekCOLORADO12011
Fence LakeNEW-MEXICO12025
GallinasNEW-MEXICO12016
BeaverUTAH12019
FayetteUTAH12025
Castle DaleUTAH12006
WestwaterUTAH12008

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