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

Sora Population Trend in Oregon

All statesWetland birds

Sora in Oregon has declined: down 40% on the route-weighted index since 1974.

-40%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 →
51Routes 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 →
51YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Sora Trends in OregonNotable 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 Sora in Oregon. See the full index history below.

Sora Population Forecast in Oregon

If the recent trend holds, Sora in Oregon is projected to rise about 33% by 2029 — from 0.14 in 2024 to a central estimate of 0.19 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±29.3%, with 100% of held-out values landing inside the 95% band.

+33%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 →
0.19Projected 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 →
0.00–0.5295% 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 →
±29.3%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, Sora in Oregon is projected to rise about 33% by 2029 — from 0.14 in 2024 to a central estimate of 0.19 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±29.3%, with 100% of held-out values landing inside the 95% band.19722029
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 →
20250.200.000.53
20260.190.000.53
20270.190.000.53
20280.190.000.52
20290.190.000.52

Sora Survey Routes in Oregon

Routes recording Sora in Oregon.
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 →
Fish Lake1020241972
Three Forks520112011
Silver Creek420211991
Chinchalo420231993
Malheur Nwr319981987
Princeton319841973
Albee219951988
Flora220001998
Summit Pr220191981
Scappoose220102010
Bridgeport220211986
Modoc Point219741974
Adair220221996
Bly220011997
Unity220182018
Prospect220132007
Blitzen 2120002000
Ordnance119771977
Imnaha119831983
Deschutes120242019
Ochoco119801980
Wickiup119971997
Dell Spring119731973
Paisley120232021
Bly 2120232007

Sora Population Trend in Other States

alaskaarizonacaliforniacoloradoidahoillinoisindianaiowakansasmainemassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-dakotaohiopennsylvaniasouth-dakotautahvermontwashingtonwisconsinwyoming

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