BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Canyon Wren In Sierra Nevada

All regionsSierra NevadaForest birds

Canyon Wren in Sierra Nevada has declined: down 46% on the route-weighted index since 1974.

-46%Since 1974TrendPercent 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 →
17Routes 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 →
50YearsYears 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 Canyon Wren in Sierra Nevada. See the full index history below.

Canyon Wren In Sierra Nevada Population Forecast

If the recent trend holds, Canyon Wren in Sierra Nevada is projected to fall about 64% by 2029 — from 0.42 in 2024 to a central estimate of 0.15 (95% range 0.00–0.64). A 5-year backtest shows a typical error of ±80.6%, with 100% of held-out values landing inside the 95% band.

-64%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 →
0.15Projected 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 →
0.00–0.6495% 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 →
±80.6%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, Canyon Wren in Sierra Nevada is projected to fall about 64% by 2029 — from 0.42 in 2024 to a central estimate of 0.15 (95% range 0.00–0.64). A 5-year backtest shows a typical error of ±80.6%, with 100% of held-out values landing inside the 95% band.19722029
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 →
20250.180.000.67
20260.180.000.66
20270.170.000.65
20280.160.000.64
20290.150.000.64

Routes In Sierra Nevada

Routes recording Canyon Wren in Sierra Nevada.
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 →
Kings CanyonCALIFORNIA72024
Forest HillCALIFORNIA32022
Bass LakeCALIFORNIA22019
Silver CityCALIFORNIA22013
Pine MountainCALIFORNIA21997
DardanelleCALIFORNIA12015
JohnsvilleCALIFORNIA11985
WoodfordsCALIFORNIA11990
Tuolumne GroveCALIFORNIA12022
Butte MeadowCALIFORNIA11981
GeneseeCALIFORNIA12023
Higgins CornCALIFORNIA11981
DownievilleCALIFORNIA12004
LakeshoreCALIFORNIA12011
PaxtonCALIFORNIA12015
ChilcootCALIFORNIA12024
StrawberryCALIFORNIA12015

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