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Species · BCR 10 · BBS 2026 Release · 1966–2025

Pygmy Nuthatch In Northern Rockies

All regionsNorthern RockiesForest birds

Pygmy Nuthatch in Northern Rockies has fallen sharply: down 58% on the route-weighted index since 1970.

-58%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 →
48Routes 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 →

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 →

Pygmy Nuthatch has fallen sharply in Northern Rockies: down 58% on the route-weighted index since 1970.

Pygmy Nuthatch In Northern Rockies Population Forecast

If the recent trend holds, Pygmy Nuthatch in Northern Rockies is projected to fall about 17% by 2030 — from 0.29 in 2025 to a central estimate of 0.24 (95% range 0.00–0.58). A 5-year backtest shows a typical error of ±29.9%, with 100% of held-out values landing inside the 95% band.

-17%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 →
0.24Projected 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 →
0.00–0.5895% 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 →
±29.9%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, Pygmy Nuthatch in Northern Rockies is projected to fall about 17% by 2030 — from 0.29 in 2025 to a central estimate of 0.24 (95% range 0.00–0.58). A 5-year backtest shows a typical error of ±29.9%, with 100% 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 →
20260.240.000.58
20270.240.000.58
20280.240.000.58
20290.240.000.58
20300.240.000.58

Routes In Northern Rockies

Routes recording Pygmy Nuthatch in Northern Rockies.
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 →
Silver CreekOREGON202025
Deer ParkWASHINGTON72015
Eagle RockOREGON61978
MonumentOREGON62025
Spring LakeWASHINGTON61990
WallowaOREGON42025
Summit PrOREGON42025
BarnhouseOREGON42025
SilviesOREGON42023
Donelly 2OREGON42025
L Pend O NwrWASHINGTON42023
KalispellMONTANA32018
ArleeMONTANA32013
Pablo Res.MONTANA32007
SkalkahoMONTANA31997
AlbeeOREGON32022
TroyOREGON31995
DonnellyOREGON32004
AlturasIDAHO21968
FeathervilleIDAHO22005
NinemileMONTANA22024
Painted RockMONTANA21997
FloraOREGON22005
OchocoOREGON21981
Mount VernonOREGON22008

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