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Species · Idaho · BBS 2025 Release · 1966–2024

Red-naped Sapsucker Population Trend in Idaho

All statesForest birds

Red-naped Sapsucker in Idaho has surged: up 79% on the route-weighted index since 1972.

+79%Since 1972TrendPercent 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 →
39Routes 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Red-naped Sapsucker 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 increasecomputed 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 →

Red-naped Sapsucker has surged in Idaho: up 79% on the route-weighted index since 1972.

Red-naped Sapsucker Population Forecast in Idaho

If the recent trend holds, Red-naped Sapsucker in Idaho is projected to stay roughly flat through 2029, near 0.89 (95% range 0.45–1.3). A 5-year backtest shows a typical error of ±28.4%, with 100% of held-out values landing inside the 95% band.

+1%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 →
0.89Projected 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 →
0.45–1.395% 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 →
±28.4%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, Red-naped Sapsucker in Idaho is projected to stay roughly flat through 2029, near 0.89 (95% range 0.45–1.3). A 5-year backtest shows a typical error of ±28.4%, 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 →
20250.850.421.3
20260.860.431.3
20270.870.431.3
20280.880.441.3
20290.890.451.3

Red-naped Sapsucker Survey Routes in Idaho

Routes recording Red-naped Sapsucker 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 →
Cascade1119841980
Lolo Pass720161992
Coolin620241986
Naples420241972
Grangeville320241989
N Fork Cda R320161994
Rochat Divde320231993
Mivoden220231980
Avery220181979
Baker220231992
Cape Horn220191986
Squirrel220241971
Alturas219861968
Triangle220141986
Magic Mtn220241989
Bates220092009
Cabarton220231985
Blackft Res120101986
Gifford120151971
Golden120161997
Challis120241975
Leadore120242006
Centerville120191983
Craters119941992
Springfield120041977

Red-naped Sapsucker Population Trend in Other States

alaskaarizonacaliforniacoloradomontananevadanew-mexicooregonsouth-dakotautahwashingtonwyoming

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