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Species · BCR 3 · BBS 2025 Release · 1966–2024

Greater Scaup In BCR 3

All regionsBCR 3Waterfowl

Greater Scaup in BCR 3 has declined: down 28% on the route-weighted index since 1996.

-28%Since 1996TrendPercent 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 →
5Routes 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 →
29YearsYears 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 Greater Scaup in BCR 3. See the full index history below.

Greater Scaup In BCR 3 Population Forecast

If the recent trend holds, Greater Scaup in BCR 3 is projected to stay roughly flat through 2029, near 3.4 (95% range 0.00–7.4). A 5-year backtest shows a typical error of ±52%, with 100% of held-out values landing inside the 95% band.

+3%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 →
3.4Projected 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 →
0.00–7.495% 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 →
±52%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, Greater Scaup in BCR 3 is projected to stay roughly flat through 2029, near 3.4 (95% range 0.00–7.4). A 5-year backtest shows a typical error of ±52%, with 100% of held-out values landing inside the 95% band.19942029
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 →
20253.50.007.5
20263.40.007.5
20273.40.007.5
20283.40.007.5
20293.40.007.4

Routes In BCR 3

Routes recording Greater Scaup in BCR 3.
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 →
Galbraith L.ALASKA82024
UtqiagvikALASKA62023
Happy ValleyALASKA32024
Red DogALASKA22024
Dietrich CmpALASKA12013

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