BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Barrow's Goldeneye In Great Basin

All regionsGreat BasinWaterfowl

Barrow's Goldeneye in Great Basin has risen sharply: up 53% on the route-weighted index since 1973.

+53%Since 1973TrendPercent 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 →
13Routes 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 →
41YearsYears 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 →

Barrow's Goldeneye has risen sharply in Great Basin: up 53% on the route-weighted index since 1973.

Forecast

If the recent trend holds, Barrow's Goldeneye in Great Basin is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±97.6%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.01Projected 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 →
0.00–0.1495% 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 →
±97.6%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, Barrow's Goldeneye in Great Basin is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±97.6%, with 100% of held-out values landing inside the 95% band.19702029
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 →
20250.010.000.14
20260.010.000.14
20270.010.000.14
20280.010.000.14
20290.010.000.14

Routes In Great Basin

Routes recording Barrow's Goldeneye 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 →
SpringfieldIDAHO151976
RimrockWASHINGTON52024
RonaldWASHINGTON42023
Iron SpringsIDAHO32015
BatesIDAHO32002
SistersOREGON32009
JosephOREGON11993
TwispWASHINGTON12024
TonasketWASHINGTON12010
LeavenworthWASHINGTON11995
NighthawkWASHINGTON12017
Moses CouleeWASHINGTON12001
No CascadesWASHINGTON12019

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