BirdAnalyst
Species · BCR 10 · BBS 2026 Release · 1966–2025

California Quail In Northern Rockies

All regionsNorthern RockiesGame birds

California Quail in Northern Rockies has surged: up 90% on the route-weighted index since 1971.

+90%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 →
49Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
55YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 →

California Quail has surged in Northern Rockies: up 90% on the route-weighted index since 1971.

California Quail In Northern Rockies Population Forecast

If the recent trend holds, California Quail in Northern Rockies is projected to stay roughly flat through 2030, near 1.0 (95% range 0.54–1.5). A 5-year backtest shows a typical error of ±18.9%, with 100% of held-out values landing inside the 95% band.

-2%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 →
1.0Projected 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 →
0.54–1.595% 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 →
±18.9%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, California Quail in Northern Rockies is projected to stay roughly flat through 2030, near 1.0 (95% range 0.54–1.5). A 5-year backtest shows a typical error of ±18.9%, with 100% 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 →
20260.950.491.4
20270.960.501.4
20280.970.521.4
20290.990.531.4
20301.00.541.5

Routes In Northern Rockies

Routes recording California Quail in Northern Rockies.
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 →
VictorMONTANA402025
BridgeportOREGON242025
SpartaOREGON212025
Deer ParkWASHINGTON202012
Crane CreekIDAHO142019
Malheur Res.OREGON132023
Mount VernonOREGON112024
ChewelahWASHINGTON112021
NewbridgeOREGON92025
MadrasOREGON82025
LaurierWASHINGTON82025
Threemile WaMONTANA72025
CurlewWASHINGTON72018
CoolinIDAHO62025
UnityOREGON62025
CentervilleIDAHO52025
Eagle RockOREGON51979
DonnybrookOREGON51997
KellerWASHINGTON52007
Rochat DivdeIDAHO42025
TroyOREGON42025
TwickenhamOREGON42025
Hash RockOREGON32025
Donelly 2OREGON32025
NezperceIDAHO22005

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