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Species · Utah · BBS 2026 Release · 1966–2025

Long-billed Curlew Population Trend in Utah

All statesShorebirds

Long-billed Curlew in Utah has declined: down 25% on the route-weighted index since 1970.

-25%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 →
32Routes 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 →
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 Long-billed Curlew Trends in UtahNotable 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 Utah. See the full index history below.

Long-billed Curlew Population Forecast in Utah

If the recent trend holds, Long-billed Curlew in Utah is projected to fall about 16% by 2030 — from 0.72 in 2025 to a central estimate of 0.60 (95% range 0.00–6.6). A 5-year backtest shows a typical error of ±49.3%, with 100% of held-out values landing inside the 95% band.

-16%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 →
0.60Projected 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 →
0.00–6.695% 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 →
±49.3%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 Utah is projected to fall about 16% by 2030 — from 0.72 in 2025 to a central estimate of 0.60 (95% range 0.00–6.6). A 5-year backtest shows a typical error of ±49.3%, 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 →
20260.890.006.9
20270.810.006.8
20280.740.006.8
20290.670.006.7
20300.600.006.6

Long-billed Curlew Survey Routes in Utah

Routes recording Long-billed Curlew in Utah.
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 →
Delta3520211988
Snowville2720251999
Promontory1320241969
Randolph920241995
Goshen820251968
Johnson Can820241991
Pine Creek620232011
Fairfield520241987
Timpie Spg420031978
Callao320251992
Grantsville320252001
Gold Hill320221988
Beryl320251998
Saleratus Cr220151995
Oak City220231979
Vernon220191992
Leamington220171995
Iron Springs 2220252024
Salt Springs120231988
Neponset Res120121995
E. Bear Lake119981995
Woodruff120112011
Beaver120192012
Iron Springs120232018
Lynn120122012

Long-billed Curlew Population Trend in Other States

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