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

Savannah Sparrow Population Trend in Indiana

All statesGrassland birds

Savannah Sparrow in Indiana has collapsed: down 77% on the route-weighted index since 1968.

-77%Since 1968TrendPercent 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 →
59Routes 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 Savannah Sparrow Trends in IndianaNotable 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 →

Savannah Sparrow has collapsed in Indiana: down 77% on the route-weighted index since 1968.

Savannah Sparrow Population Forecast in Indiana

If the recent trend holds, Savannah Sparrow in Indiana is projected to fall about 38% by 2029 — from 1.3 in 2024 to a central estimate of 0.79 (95% range 0.00–2.8). A 5-year backtest shows a typical error of ±15.1%, with 100% of held-out values landing inside the 95% band.

-38%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 →
0.79Projected 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 →
0.00–2.895% 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 →
±15.1%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, Savannah Sparrow in Indiana is projected to fall about 38% by 2029 — from 1.3 in 2024 to a central estimate of 0.79 (95% range 0.00–2.8). A 5-year backtest shows a typical error of ±15.1%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20251.10.003.0
20260.990.003.0
20270.920.002.9
20280.860.002.8
20290.790.002.8

Savannah Sparrow Survey Routes in Indiana

Routes recording Savannah Sparrow in Indiana.
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 →
Middlebury1920241989
Packertown1320041967
Witts Station1020242000
Muncie919971981
Lagrange620241999
Jamestown420241986
Cuba420212017
Lakeville420242023
Kokomo420241995
Gary319991980
Fowler320241966
Monticello320241981
Thorntown320241982
Tipton319921966
Swayzee320131981
Scottsburg320091995
Decatur320191999
Plainfield319991999
Galveston220241981
Wabash220221981
Brazil220241980
Milroy220241966
Maplewood220212000
Corydon220011979
Frankfort220221999

Savannah Sparrow Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutdelawareidahoillinoisiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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