BirdAnalyst
Species · Maine · BBS 2025 Release · 1966–2024

Common Goldeneye Population Trend in Maine

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Common Goldeneye in Maine has collapsed: down 93% on the route-weighted index since 1983.

-93%Since 1983TrendPercent 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 →
15Routes 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 →
22YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Goldeneye Trends in MaineNotable 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 declinecomputed 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 →

Common Goldeneye has collapsed in Maine: down 93% on the route-weighted index since 1983.

Common Goldeneye Population Forecast in Maine

If the recent trend holds, Common Goldeneye in Maine is projected to stay roughly flat through 2023, near 0.00 (95% range 0.00–0.55). A 5-year backtest shows a typical error of ±857.5%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2023TrendPercent 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 →
0.00Projected 2023 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.5595% 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 →
±857.5%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, Common Goldeneye in Maine is projected to stay roughly flat through 2023, near 0.00 (95% range 0.00–0.55). A 5-year backtest shows a typical error of ±857.5%, with 100% of held-out values landing inside the 95% band.19672023
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 →
20190.000.000.55
20200.000.000.55
20210.000.000.55
20220.000.000.55
20230.000.000.55

Common Goldeneye Survey Routes in Maine

Routes recording Common Goldeneye in Maine.
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 →
Forest Sta919671967
St David420041985
Washburn320051988
Carrabassett119931983
Baxter119841984
Seboomook Lk120131972
Greenville119871987
Nesowadnehun119921990
Medway120181995
Grnd Lk Strm119901990
Clayton Lake119981998
Lake Moxie120112011
Horse Mtn119901986
Heron Lake119831983
Weeks Brook120031997

Common Goldeneye Population Trend in Other States

alaskacaliforniaidahomichiganminnesotamontananew-hampshirenew-yorknorth-dakotavermontwashingtonwisconsinwyoming

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