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

Bald Eagle Population Trend in Oregon

All statesGeneralists

Bald Eagle in Oregon has surged: up 836% on the route-weighted index since 1975.

+836%Since 1975TrendPercent 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 →
61Routes 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 →
49YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bald Eagle Trends in OregonNotable 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 →

Bald Eagle has surged in Oregon: up 836% on the route-weighted index since 1975.

Bald Eagle Population Forecast in Oregon

If the recent trend holds, Bald Eagle in Oregon is projected to fall about 20% by 2029 — from 0.42 in 2024 to a central estimate of 0.33 (95% range 0.22–0.45). A 5-year backtest shows a typical error of ±34.6%, with 20% of held-out values landing inside the 95% band.

-20%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 →
0.33Projected 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 →
0.22–0.4595% 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 →
±34.6%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, Bald Eagle in Oregon is projected to fall about 20% by 2029 — from 0.42 in 2024 to a central estimate of 0.33 (95% range 0.22–0.45). A 5-year backtest shows a typical error of ±34.6%, with 20% of held-out values landing inside the 95% band.19732029
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 →
20250.310.190.43
20260.320.200.43
20270.320.200.44
20280.330.210.45
20290.330.220.45

Bald Eagle Survey Routes in Oregon

Routes recording Bald Eagle in Oregon.
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 →
Crane820242021
Modoc Point 2720242024
Joseph720241995
Malheur Res.720232022
Merrill420221995
Modoc Point320181973
Imnaha220242005
Wizard Falls220152000
Emigrant Lake 2220212002
Scio220192007
Elkton220241982
Troy220232014
Unity220242018
Salem220242008
Davis Lake220242002
Chinchalo220221995
Tualatin120232006
Albee120212013
Riley Peak120111994
Salado120152015
Cool Camp119841984
Deschutes120172017
Summit Pr120242011
Lapham Res.120022002
Nicolai Mtn.120241994

Bald Eagle Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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