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

Blue-gray Gnatcatcher In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestForest birds

Blue-gray Gnatcatcher in Northern Pacific Rainforest has declined: down 34% on the route-weighted index since 1970.

-34%Since 1970TrendPercent 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 →
19Routes 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 →
56YearsYears 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 Blue-gray Gnatcatcher in Northern Pacific Rainforest. See the full index history below.

Blue-gray Gnatcatcher In Northern Pacific Rainforest Population Forecast

If the recent trend holds, Blue-gray Gnatcatcher in Northern Pacific Rainforest is projected to rise about 240% by 2030 — from 0.06 in 2025 to a central estimate of 0.19 (95% range 0.01–0.38). A 5-year backtest shows a typical error of ±521.1%, with 40% of held-out values landing inside the 95% band.

+240%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 →
0.19Projected 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 →
0.01–0.3895% 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 →
±521.1%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, Blue-gray Gnatcatcher in Northern Pacific Rainforest is projected to rise about 240% by 2030 — from 0.06 in 2025 to a central estimate of 0.19 (95% range 0.01–0.38). A 5-year backtest shows a typical error of ±521.1%, with 40% of held-out values landing inside the 95% band.19682030
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 →
20260.190.010.38
20270.190.010.38
20280.190.010.38
20290.190.010.38
20300.190.010.38

Routes In Northern Pacific Rainforest

Routes recording Blue-gray Gnatcatcher 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 →
HullvilleCALIFORNIA122019
Hay ForkCALIFORNIA92017
French GulchCALIFORNIA62007
DaytonOREGON51997
LongvaleCALIFORNIA42023
Mt ShastaCALIFORNIA32018
Friday RidgeCALIFORNIA32025
Junction CtyCALIFORNIA22011
Offield MtnCALIFORNIA22003
Orleans 2CALIFORNIA22014
GazelleCALIFORNIA22019
HolmesCALIFORNIA11969
Shasta LakeCALIFORNIA12025
OrleansCALIFORNIA12006
LaytonvilleCALIFORNIA12002
Days CreekOREGON12016
DerbyOREGON11993
Sams ValleyOREGON12018
RuchOREGON12004

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