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

Mountain Quail Population Trend in Oregon

All statesGame birds

Mountain Quail in Oregon has held roughly steady: up 7% on the route-weighted index since 1971.

+7%Since 1971TrendPercent 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 →
53Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Mountain Quail 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 Mountain Quail in Oregon. See the full index history below.

Mountain Quail Population Forecast in Oregon

If the recent trend holds, Mountain Quail in Oregon is projected to fall about 21% by 2030 — from 0.52 in 2025 to a central estimate of 0.41 (95% range 0.07–0.74). A 5-year backtest shows a typical error of ±34.9%, with 80% of held-out values landing inside the 95% band.

-21%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 →
0.41Projected 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 →
0.07–0.7495% 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 →
±34.9%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, Mountain Quail in Oregon is projected to fall about 21% by 2030 — from 0.52 in 2025 to a central estimate of 0.41 (95% range 0.07–0.74). A 5-year backtest shows a typical error of ±34.9%, 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 →
20260.410.080.75
20270.410.080.75
20280.410.080.74
20290.410.070.74
20300.410.070.74

Mountain Quail Survey Routes in Oregon

Routes recording Mountain Quail 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 →
Hazel Camp1420221977
Prospect1420251993
Twickenham920162011
Mt Hood720221990
Ruch620251993
Hash Rock620252021
Monument620251998
Paunina520112006
Badger Creek420252000
Shellrock320192007
Days Creek320251970
Emigrant Lake 2320232006
Emigrant Lk319911972
Ochoco320152015
Crooked Riv.320252025
Sams Valley320241993
Molalla219951994
Scappoose220092009
Wizard Falls220162010
Harlan 2220252016
Elkton220241973
Clearwater220121991
Waldport220011993
Blue River220061997
Cinderella220251993

Mountain Quail Population Trend in Other States

californianevadawashington

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