BirdAnalyst
Species · BCR 16 · BBS 2026 Release · 1966–2025

House Sparrow In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

House Sparrow in Southern Rockies / Colorado Plateau has declined: down 29% on the route-weighted index since 1970.

-29%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 →
139Routes 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 →
57YearsYears 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.

House Sparrow In Southern Rockies / Colorado Plateau Population Forecast

If the recent trend holds, House Sparrow in Southern Rockies / Colorado Plateau is projected to fall about 43% by 2030 — from 5.7 in 2025 to a central estimate of 3.2 (95% range 0.00–7.6). A 5-year backtest shows a typical error of ±53%, with 100% of held-out values landing inside the 95% band.

-43%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 →
3.2Projected 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 →
0.00–7.695% 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 →
±53%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 43% by 2030 — from 5.7 in 2025 to a central estimate of 3.2 (95% range 0.00–7.6). A 5-year backtest shows a typical error of ±53%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20263.70.008.0
20273.60.007.9
20283.50.007.8
20293.40.007.7
20303.20.007.6

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 →
KamasUTAH942025
AlamosaCOLORADO862025
FruitaCOLORADO762007
FalfaCOLORADO712025
ValenciaNEW-MEXICO691997
MoscaCOLORADO652025
Peach SpringARIZONA642025
La PlataNEW-MEXICO642013
YampaCOLORADO462023
Wellington 3UTAH462025
MoffatCOLORADO432025
AnethUTAH422024
PaoniaCOLORADO412025
Cortez 2COLORADO382017
CortezCOLORADO342008
BeaverUTAH342025
WellingtonUTAH342002
AztecNEW-MEXICO291989
TorreonNEW-MEXICO262025
ShivwitzUTAH252010
PageARIZONA242019
BicknellUTAH222025
SeligmanARIZONA212025
CrownpointNEW-MEXICO211996
La Plata 2NEW-MEXICO202016

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