BirdAnalyst
Species · South Dakota · BBS 2026 Release · 1966–2025

House Sparrow Population Trend in South Dakota

All statesGeneralists

House Sparrow in South Dakota has fallen sharply: down 57% on the route-weighted index since 1969.

-57%Since 1969TrendPercent 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 →
55Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable House Sparrow Trends in South DakotaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

House Sparrow has fallen sharply in South Dakota: down 57% on the route-weighted index since 1969.

House Sparrow Population Forecast in South Dakota

If the recent trend holds, House Sparrow in South Dakota is projected to fall about 100% by 2030 — from 10 in 2025 to a central estimate of 0.00 (95% range 0.00–20). A 5-year backtest shows a typical error of ±113.1%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–2095% 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 →
±113.1%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 South Dakota is projected to fall about 100% by 2030 — from 10 in 2025 to a central estimate of 0.00 (95% range 0.00–20). A 5-year backtest shows a typical error of ±113.1%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20260.960.0021
20270.460.0020
20280.000.0020
20290.000.0020
20300.000.0020

House Sparrow Survey Routes in South Dakota

Routes recording House Sparrow in South Dakota.
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 →
Conde36419841967
Owanka8620221967
Howard7120251970
Turton5620251985
Forbes3420251968
Lennox3220251967
White Lake2420111967
Volga2020251967
Crow Creek2020191968
Volunteer2020251967
Lane 21920142000
Britton1720231967
Lane1619991968
Raymond1320211967
Ft Thompson1320111967
Lacreek1120251991
Cedar Pass1020251969
White River1020131994
Custer920251967
Badlands820251982
Chamberlain620111967
Roubaix Lk619891973
Eagle Butte620131990
Isabel620131990
S. Pioneer620021998

House Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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