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

House Sparrow In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

House Sparrow in Southern Rockies / Colorado Plateau has declined: down 26% on the route-weighted index since 1970.

-26%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 →
137Routes 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 House Sparrow in Southern Rockies / Colorado Plateau. See the full index history below.

Forecast

If the recent trend holds, House Sparrow in Southern Rockies / Colorado Plateau is projected to fall about 44% by 2029 — from 5.7 in 2024 to a central estimate of 3.2 (95% range 0.00–7.5). A 5-year backtest shows a typical error of ±49.9%, with 80% of held-out values landing inside the 95% band.

-44%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 →
3.2Projected 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 →
0.00–7.595% 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 →
±49.9%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, House Sparrow in Southern Rockies / Colorado Plateau is projected to fall about 44% by 2029 — from 5.7 in 2024 to a central estimate of 3.2 (95% range 0.00–7.5). A 5-year backtest shows a typical error of ±49.9%, with 80% 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 →
20253.60.008.0
20263.50.007.9
20273.40.007.8
20283.30.007.6
20293.20.007.5

Routes In Southern Rockies / Colorado Plateau

Routes recording House Sparrow 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 →
KamasUTAH882024
FalfaCOLORADO842024
Peach SpringARIZONA762024
FruitaCOLORADO762007
ValenciaNEW-MEXICO691997
La PlataNEW-MEXICO642013
MoscaCOLORADO512024
PaoniaCOLORADO482024
YampaCOLORADO462023
AnethUTAH422024
Cortez 2COLORADO382017
AlamosaCOLORADO362024
CortezCOLORADO342008
WellingtonUTAH342002
EscalanteUTAH312024
AztecNEW-MEXICO291989
SeligmanARIZONA282024
ShivwitzUTAH252010
PageARIZONA242019
CrownpointNEW-MEXICO211996
BeaverUTAH212024
La Plata 2NEW-MEXICO202016
Wellington 3UTAH202024
La CienegaNEW-MEXICO192022
De BequeCOLORADO172024

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