BirdAnalyst
Species · Louisiana · BBS 2025 Release · 1966–2024

House Sparrow Population Trend in Louisiana

All statesGeneralists

House Sparrow in Louisiana has collapsed: down 86% on the route-weighted index since 1969.

-86%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 →
88Routes 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 →
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 House Sparrow Trends in LouisianaNotable 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 collapsed in Louisiana: down 86% on the route-weighted index since 1969.

House Sparrow Population Forecast in Louisiana

If the recent trend holds, House Sparrow in Louisiana is projected to fall about 100% by 2029 — from 7.5 in 2024 to a central estimate of 0.00 (95% range 0.00–19). A 5-year backtest shows a typical error of ±150.7%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–1995% 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 →
±150.7%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 Louisiana is projected to fall about 100% by 2029 — from 7.5 in 2024 to a central estimate of 0.00 (95% range 0.00–19). A 5-year backtest shows a typical error of ±150.7%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20250.000.0019
20260.000.0019
20270.000.0019
20280.000.0019
20290.000.0019

House Sparrow Survey Routes in Louisiana

Routes recording House Sparrow in Louisiana.
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 →
Mamou9719821967
Creole8319871967
Carlisle5919881968
Morgan City5519861967
Keystone5420131967
Kraemer5120241997
Natchitoches4019911987
Gran Chenier3819821967
Baton Rouge3820241995
Gonzales3620191998
Easton3519901967
Brousville3520241998
Forked Island 23420112010
Mayflower3020241967
Lafitte2919911967
Ville Platte2820191988
Cypress2219871967
Larose2119921988
Junior1919911987
Greensburg1920221988
Many1819921989
Forked Island1820242008
Roseland1620241967
Floyd1420211988
Gibson1420191999

House Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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