BirdAnalyst
Species · Idaho · BBS 2025 Release · 1966–2024

Townsend's Solitaire Population Trend in Idaho

All statesForest birds

Townsend's Solitaire in Idaho has edged down: down 19% on the route-weighted index since 1976.

-19%Since 1976TrendPercent 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 →
35Routes 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 →
49YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Townsend's Solitaire 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 →

No notable trend signals for Townsend's Solitaire in Idaho. See the full index history below.

Townsend's Solitaire Population Forecast in Idaho

If the recent trend holds, Townsend's Solitaire in Idaho is projected to rise about 98% by 2029 — from 0.20 in 2024 to a central estimate of 0.40 (95% range 0.08–0.71). A 5-year backtest shows a typical error of ±101.5%, with 100% of held-out values landing inside the 95% band.

+98%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 →
0.40Projected 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 →
0.08–0.7195% 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 →
±101.5%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, Townsend's Solitaire in Idaho is projected to rise about 98% by 2029 — from 0.20 in 2024 to a central estimate of 0.40 (95% range 0.08–0.71). A 5-year backtest shows a typical error of ±101.5%, 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 →
20250.380.070.69
20260.390.070.70
20270.390.080.70
20280.390.080.70
20290.400.080.71

Townsend's Solitaire Survey Routes in Idaho

Routes recording Townsend's Solitaire 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 →
Challis620111977
Lolo Pass520191992
Cascade419761976
Squirrel420091974
Cobalt420121992
Cape Horn320061986
Coolin320241986
Grangeville220211990
Golden220161989
Alturas219681968
Marble Creek220232004
Burgdorf220161996
Featherville220241997
Sawtooth Cty220061989
Naples119881979
Mivoden120231979
Avery120191980
Twin Buttes119991999
Deep Creek119851985
Baker120121977
Leadore120141977
N Fork Cda R120031995
Rochat Divde120231993
Centerville120161982
Springfield119811976

Townsend's Solitaire Population Trend in Other States

alaskaarizonacaliforniacoloradomontananebraskanevadanew-mexicooregonsouth-dakotautahwashingtonwyoming

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