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Species · Utah · BBS 2025 Release · 1966–2024

Long-billed Curlew Population Trend in Utah

All statesShorebirds

Long-billed Curlew in Utah has edged down: down 11% on the route-weighted index since 1970.

-11%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 →
56YearsYears 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 61% by 2029 — from 1.7 in 2024 to a central estimate of 0.68 (95% range 0.00–6.7). A 5-year backtest shows a typical error of ±55.1%, with 100% of held-out values landing inside the 95% band.

-61%Change by 2029TrendPercent 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 →
0.68Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–6.795% 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 →
±55.1%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 61% by 2029 — from 1.7 in 2024 to a central estimate of 0.68 (95% range 0.00–6.7). A 5-year backtest shows a typical error of ±55.1%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.960.007.0
20260.890.007.0
20270.820.006.9
20280.750.006.8
20290.680.006.7

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 →
Snowville4020241999
Delta3520211988
Goshen1520241968
Bear River1520231992
Promontory1320241969
Randolph920241995
Johnson Can820241991
Jericho Junction720241997
Pine Creek620232011
Beryl620191998
Fairfield520241987
Timpie Spg420031978
Fayette420191992
Iron Springs 2420242024
Gold Hill320221988
Saleratus Cr220151995
Oak City220231979
Vernon220191992
Leamington220171995
Salt Springs120231988
Neponset Res120121995
E. Bear Lake119981995
Woodruff120112011
Beaver120192012
Iron Springs120232018

Long-billed Curlew Population Trend in Other States

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