BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Osprey In Great Basin

All regionsGreat BasinBirds of prey

Osprey in Great Basin has surged: up 12× on the route-weighted index since 1972.

12×Since 1972TrendPercent 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 →
91Routes 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 →
52YearsYears 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 →

No notable trend signals for Osprey in Great Basin. See the full index history below.

Osprey In Great Basin Population Forecast

If the recent trend holds, Osprey in Great Basin is projected to stay roughly flat through 2030, near 0.37 (95% range 0.23–0.50). A 5-year backtest shows a typical error of ±83.5%, with 40% of held-out values landing inside the 95% band.

+6%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 →
0.37Projected 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 →
0.23–0.5095% 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 →
±83.5%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, Osprey in Great Basin is projected to stay roughly flat through 2030, near 0.37 (95% range 0.23–0.50). A 5-year backtest shows a typical error of ±83.5%, with 40% of held-out values landing inside the 95% band.19702030
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 →
20260.340.210.48
20270.350.210.48
20280.350.220.49
20290.360.230.49
20300.370.230.50

Routes In Great Basin

Routes recording Osprey in Great Basin.
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 →
Iron GateCALIFORNIA262019
Modoc Point 2OREGON132025
NighthawkWASHINGTON62025
RirieIDAHO52025
BatesIDAHO52023
JosephOREGON52025
Ewan 2WASHINGTON52025
HackamoreCALIFORNIA32003
RimrockWASHINGTON32025
EwanWASHINGTON32019
NubieberCALIFORNIA22006
BartleCALIFORNIA21999
Crowder FlatCALIFORNIA22002
Fall River MillsCALIFORNIA22011
GiffordIDAHO21997
SpringfieldIDAHO22018
Daniels ResIDAHO21998
PrestonIDAHO22016
Fandango CanOREGON22010
Modoc PointOREGON22018
UmatillaOREGON22023
Wizard FallsOREGON22017
Bly 2OREGON22011
AsotinWASHINGTON22024
PrescottWASHINGTON22019

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