BirdAnalyst
Species · BCR 5 · BBS 2026 Release · 1966–2025

American Dipper In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestWetland birds

American Dipper in Northern Pacific Rainforest has edged down: down 15% on the route-weighted index since 1972.

-15%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 →
63Routes 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 →
54YearsYears 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 American Dipper in Northern Pacific Rainforest. See the full index history below.

American Dipper In Northern Pacific Rainforest Population Forecast

If the recent trend holds, American Dipper in Northern Pacific Rainforest is projected to rise about 21% by 2030 — from 0.07 in 2025 to a central estimate of 0.09 (95% range 0.01–0.17). A 5-year backtest shows a typical error of ±25.4%, with 100% of held-out values landing inside the 95% band.

+21%Change by 2030TrendPercent 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 →
0.09Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.01–0.1795% 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 →
±25.4%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 Northern Pacific Rainforest is projected to rise about 21% by 2030 — from 0.07 in 2025 to a central estimate of 0.09 (95% range 0.01–0.17). A 5-year backtest shows a typical error of ±25.4%, with 100% of held-out values landing inside the 95% band.19692030
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 →
20260.090.010.17
20270.090.010.17
20280.090.010.17
20290.090.010.17
20300.090.010.17

Routes In Northern Pacific Rainforest

Routes recording American Dipper in Northern Pacific Rainforest.
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 →
WhiskeytownCALIFORNIA52007
SvensenOREGON31992
Thorne Bay 2ALASKA22018
HyderALASKA22001
OrleansCALIFORNIA22012
KorbelCALIFORNIA22021
HiouchiCALIFORNIA22012
Big FlatCALIFORNIA22002
Hay ForkCALIFORNIA22005
TimberOREGON22017
ScioOREGON22002
Blue RiverOREGON22022
Riley PeakOREGON22016
IssaquahWASHINGTON21979
GreenwaterWASHINGTON22025
Juneau AltALASKA11984
JuneauALASKA12021
HainesALASKA12022
CordovaALASKA12017
Harlequin L.ALASKA12004
Chichagof IsALASKA12024
Sitka (Short)ALASKA11986
Horse CreekCALIFORNIA12018
CarrvilleCALIFORNIA11970
HoneydewCALIFORNIA12008

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.