BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Bewick's Wren In Northern Rockies

All regionsNorthern RockiesForest birds

Bewick's Wren in Northern Rockies has declined: down 39% on the route-weighted index since 1976.

-39%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 →
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 →
39YearsYears 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 52% by 2029 — from 0.15 in 2024 to a central estimate of 0.07 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±23.8%, with 100% of held-out values landing inside the 95% band.

-52%Change 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 →
0.07Projected 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 →
0.00–0.2095% 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 →
±23.8%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 52% by 2029 — from 0.15 in 2024 to a central estimate of 0.07 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±23.8%, with 100% of held-out values landing inside the 95% band.19732029
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 →
20250.080.000.20
20260.070.000.20
20270.070.000.20
20280.070.000.20
20290.070.000.20

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 →
MaybellCOLORADO62024
Browns ParkCOLORADO42024
LayCOLORADO42024
NewbridgeOREGON32024
Deer ParkWASHINGTON22008
Mtn ViewWYOMING21999
Great DivideCOLORADO12024
Mount VernonOREGON12024
TroyOREGON12019
Black Mtn.OREGON12000
TwickenhamOREGON12024
Saleratus CrUTAH11997
Crawford MtsUTAH12015
KellerWASHINGTON12006
Spring LakeWASHINGTON12024
BairoilWYOMING11990
Rock SpringsWYOMING12017
BaggsWYOMING12022
SeedskadeeWYOMING12014

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