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

Brown Creeper Population Trend in Idaho

All statesForest birds

Brown Creeper in Idaho has fallen sharply: down 56% on the route-weighted index since 1974.

-56%Since 1974TrendPercent 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 →
29Routes 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 →
47YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Brown Creeper 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Brown Creeper has fallen sharply in Idaho: down 56% on the route-weighted index since 1974.

Brown Creeper Population Forecast in Idaho

If the recent trend holds, Brown Creeper in Idaho is projected to rise about 14% by 2030 — from 0.09 in 2025 to a central estimate of 0.10 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±58.3%, with 80% of held-out values landing inside the 95% band.

+14%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 →
0.10Projected 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 →
0.00–0.3995% 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 →
±58.3%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, Brown Creeper in Idaho is projected to rise about 14% by 2030 — from 0.09 in 2025 to a central estimate of 0.10 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±58.3%, with 80% 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 →
20260.100.000.40
20270.100.000.40
20280.100.000.40
20290.100.000.39
20300.100.000.39

Brown Creeper Survey Routes in Idaho

Routes recording Brown Creeper 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 →
Lolo Pass1020191999
Nezperce319851985
Coolin320251986
Cabarton320072003
Grangeville220231994
N Fork Cda R220191993
Cascade219831983
Salmon River220232003
Burgdorf220131988
Naples120211975
Mivoden120241998
Avery120231995
Golden120032003
Cape Horn120082007
Challis120041984
Rochat Divde120231993
Squirrel120211984
Centerville119741974
Alturas119691968
Springfield119781978
Magic Mtn120221988
Marble Creek120241992
Joel119901990
Pierce119971992
Yellow Pine120091993

Brown Creeper Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutillinoisindianaiowamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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