BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Bewick's Wren In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauForest birds

Bewick's Wren in Southern Rockies / Colorado Plateau has held roughly steady: down 5% on the route-weighted index since 1970.

-5%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 →
129Routes 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 Bewick's Wren in Southern Rockies / Colorado Plateau. See the full index history below.

Bewick's Wren In Southern Rockies / Colorado Plateau Population Forecast

If the recent trend holds, Bewick's Wren in Southern Rockies / Colorado Plateau is projected to rise about 49% by 2029 — from 0.83 in 2024 to a central estimate of 1.2 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±119.3%, with 100% of held-out values landing inside the 95% band.

+49%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 →
1.2Projected 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 →
0.00–2.795% 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 →
±119.3%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 Southern Rockies / Colorado Plateau is projected to rise about 49% by 2029 — from 0.83 in 2024 to a central estimate of 1.2 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±119.3%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20251.30.002.8
20261.30.002.8
20271.30.002.7
20281.20.002.7
20291.20.002.7

Routes In Southern Rockies / Colorado Plateau

Routes recording Bewick's Wren in Southern Rockies / Colorado Plateau.
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 →
MoffatCOLORADO461987
ZeniffARIZONA441984
ClaunchNEW-MEXICO382000
Black MesaARIZONA371995
PecosNEW-MEXICO352017
Claunch 2NEW-MEXICO302024
La CienegaNEW-MEXICO182022
FarmingtonNEW-MEXICO121983
MountainairNEW-MEXICO122024
AnimasCOLORADO112000
AztecNEW-MEXICO101989
Fence LakeNEW-MEXICO92024
House RockARIZONA82022
DeltaCOLORADO82021
Blackhead PkCOLORADO82019
Cane Spr DesUTAH81992
PageARIZONA62015
WalsenburgCOLORADO62024
RosevaleCOLORADO52024
AngoraCOLORADO52024
McgaffeyNEW-MEXICO52023
La Plata 2NEW-MEXICO52016
ShivwitzUTAH52024
Arches NpUTAH52006
HuntARIZONA42006

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