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Species · Utah · BBS 2025 Release · 1966–2024

Savannah Sparrow Population Trend in Utah

All statesGrassland birds

Savannah Sparrow in Utah has surged: up 128% on the route-weighted index since 1970.

+128%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 →
60Routes 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 →
50YearsYears 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 UtahNotable 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 increasecomputed 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 surged in Utah: up 128% on the route-weighted index since 1970.

Savannah Sparrow Population Forecast in Utah

If the recent trend holds, Savannah Sparrow in Utah is projected to rise about 56% by 2029 — from 1.2 in 2024 to a central estimate of 1.8 (95% range 0.72–3.0). A 5-year backtest shows a typical error of ±17.7%, with 100% of held-out values landing inside the 95% band.

+56%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 →
1.8Projected 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 →
0.72–3.095% 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 →
±17.7%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, Savannah Sparrow in Utah is projected to rise about 56% by 2029 — from 1.2 in 2024 to a central estimate of 1.8 (95% range 0.72–3.0). A 5-year backtest shows a typical error of ±17.7%, with 100% 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 →
20251.80.642.9
20261.80.662.9
20271.80.682.9
20281.80.703.0
20291.80.723.0

Savannah Sparrow Survey Routes in Utah

Routes recording Savannah Sparrow in Utah.
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 →
Bear River4020231992
Callao3020241992
Neponset Res2320181995
Uintah Nf1319941990
Hill Creek1119931993
Kamas1120241997
Leamington620161993
Fish Lake Nf619991992
Willow Creek520011997
Randolph520241992
Vernal520172006
Bicknell520211997
Delta520241994
Dragerton419731973
Hanna420241997
Beck319861986
Castleton319741974
M Warner Res320241996
Snowville320241999
Jericho Junction320182006
Gold Hill320242015
Wellington 3220222022
Wendover220051974
Timpie Spg219981980
Goshen220241968

Savannah Sparrow Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseevermontvirginiawashingtonwest-virginiawisconsinwyoming

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