BirdAnalyst
Species · BCR 5 · BBS 2025 Release · 1966–2024

Blackpoll Warbler In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestForest birds

Blackpoll Warbler in Northern Pacific Rainforest has collapsed: down 96% on the route-weighted index since 1985.

-96%Since 1985TrendPercent 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 →
12Routes 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 →
34YearsYears 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 →

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 →

Blackpoll Warbler has collapsed in Northern Pacific Rainforest: down 96% on the route-weighted index since 1985.

Forecast

If the recent trend holds, Blackpoll Warbler in Northern Pacific Rainforest is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.31). A 5-year backtest shows a typical error of ±141.4%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.00Projected 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 →
0.00–0.3195% 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 →
±141.4%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, Blackpoll Warbler in Northern Pacific Rainforest is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.31). A 5-year backtest shows a typical error of ±141.4%, with 100% of held-out values landing inside the 95% band.19832029
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 →
20250.000.000.31
20260.000.000.31
20270.000.000.31
20280.000.000.31
20290.000.000.31

Routes In Northern Pacific Rainforest

Routes recording Blackpoll Warbler 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 →
Sheep MtnALASKA262017
Thorne BayALASKA91990
SewardALASKA61984
Elmendorf (Short)ALASKA51985
HainesALASKA21994
CordovaALASKA21996
Thompson PasALASKA22024
Kenai Lake (Short)ALASKA21984
Moose PassALASKA11985
SkagwayALASKA12015
HyderALASKA11995
Alpenglow (Short)ALASKA12004

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