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

American Dipper Population Trend in Oregon

All statesGeneralists

American Dipper in Oregon has edged down: down 21% on the route-weighted index since 1972.

-21%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 →
39Routes 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 →
47YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Dipper 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 →

No notable trend signals for American Dipper in Oregon. See the full index history below.

American Dipper Population Forecast in Oregon

If the recent trend holds, American Dipper in Oregon is projected to fall about 56% by 2029 — from 0.13 in 2024 to a central estimate of 0.06 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±72.6%, with 80% of held-out values landing inside the 95% band.

-56%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 →
0.06Projected 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 →
0.00–0.1295% 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 →
±72.6%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, American Dipper in Oregon is projected to fall about 56% by 2029 — from 0.13 in 2024 to a central estimate of 0.06 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±72.6%, with 80% of held-out values landing inside the 95% band.19692029
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 →
20250.060.000.12
20260.060.000.12
20270.060.000.12
20280.060.000.12
20290.060.000.12

American Dipper Survey Routes in Oregon

Routes recording American Dipper 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 →
Molalla920241996
Svensen319921992
Timber220171993
Riley Peak220161995
Scio220021998
Camp Sherman219941972
Blue River220221992
Sandy River119951993
Santiam120181999
Imnaha119931972
Salado120172017
Cool Camp120031969
Logdell119881987
Wickiup120241988
Bridgeport119951995
Winberry120021969
Wizard Falls120162016
Derby119701970
Paisley120212008
Bly 2120082008
Mt Hood120151974
Granite119891989
Elkton119721972
Clearwater120061992
Elk Lake119911978

American Dipper Population Trend in Other States

alaskacaliforniacoloradoidahomontananevadanew-mexicosouth-dakotautahwashingtonwyoming

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