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Species · Idaho · BBS 2026 Release · 1966–2025

American Goshawk Population Trend in Idaho

All statesBirds of prey

American Goshawk in Idaho has fallen sharply: down 71% on the route-weighted index since 1984.

-71%Since 1984TrendPercent 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 →
20Routes 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 →
21YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Goshawk 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 →

American Goshawk has fallen sharply in Idaho: down 71% on the route-weighted index since 1984.

American Goshawk Population Forecast in Idaho

If the recent trend holds, American Goshawk in Idaho is projected to fall about 100% by 2030 — from 0.09 in 2025 to a central estimate of 0.00 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±224.3%, with 60% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–0.1195% 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 →
±224.3%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, American Goshawk in Idaho is projected to fall about 100% by 2030 — from 0.09 in 2025 to a central estimate of 0.00 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±224.3%, with 60% of held-out values landing inside the 95% band.19732030
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 →
20260.000.000.11
20270.000.000.11
20280.000.000.11
20290.000.000.11
20300.000.000.11

American Goshawk Survey Routes in Idaho

Routes recording American Goshawk 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 →
Blacks Creek219731973
Mivoden119841982
Rochat Divde120252025
Cape Horn120122012
Centerville120191973
Magic Mtn120251994
Coolin120072007
Sawtooth City 2120182016
Marble Creek119901990
Joel119891989
Salmon River119961996
Burgdorf120252025
Cobalt119891989
Yellow Pine120041998
Sunbeam120191995
Silver City120072007
Dougal Res120032003
Preston119891989
Cabarton119931993
Sawtooth Cty119971997

American Goshawk Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutmainemassachusettsmichiganminnesotamontananevadanew-hampshirenew-jerseynew-mexiconew-yorkoregonpennsylvaniarhode-islandsouth-dakotautahvermontwashingtonwisconsinwyoming

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