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

Bewick's Wren In Northern Rockies

All regionsNorthern RockiesForest birds

Bewick's Wren in Northern Rockies has declined: down 28% on the route-weighted index since 1976.

-28%Since 1976TrendPercent 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 →
22Routes 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 →
40YearsYears 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 Bewick's Wren in Northern Rockies. See the full index history below.

Bewick's Wren In Northern Rockies Population Forecast

If the recent trend holds, Bewick's Wren in Northern Rockies is projected to fall about 44% by 2030 — from 0.14 in 2025 to a central estimate of 0.07 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±27.6%, with 100% of held-out values landing inside the 95% band.

-44%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 →
0.07Projected 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 →
0.00–0.2095% 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 →
±27.6%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, Bewick's Wren in Northern Rockies is projected to fall about 44% by 2030 — from 0.14 in 2025 to a central estimate of 0.07 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±27.6%, with 100% of held-out values landing inside the 95% band.19732030
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 →
20260.080.000.20
20270.080.000.20
20280.080.000.20
20290.080.000.20
20300.070.000.20

Routes In Northern Rockies

Routes recording Bewick's Wren 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 →
MaybellCOLORADO62025
SpartaOREGON42025
Browns ParkCOLORADO32025
LayCOLORADO32025
WallowaOREGON22025
Deer ParkWASHINGTON22008
Mtn ViewWYOMING21999
Great DivideCOLORADO12024
Mount VernonOREGON12024
TroyOREGON12019
NewbridgeOREGON12025
Black Mtn.OREGON12000
TwickenhamOREGON12024
Saleratus CrUTAH11997
Crawford MtsUTAH12015
KellerWASHINGTON12006
Spring LakeWASHINGTON12024
BairoilWYOMING11990
Rock SpringsWYOMING12017
BaggsWYOMING12025
SeedskadeeWYOMING12014
Carter 2WYOMING12025

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