BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Savannah Sparrow In Great Basin

All regionsGreat BasinGrassland birds

Savannah Sparrow in Great Basin has surged: up 92% on the route-weighted index since 1970.

+92%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 →
200Routes 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 →
56YearsYears 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 →

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 Great Basin: up 92% on the route-weighted index since 1970.

Savannah Sparrow In Great Basin Population Forecast

If the recent trend holds, Savannah Sparrow in Great Basin is projected to rise about 30% by 2029 — from 3.6 in 2024 to a central estimate of 4.7 (95% range 2.8–6.7). A 5-year backtest shows a typical error of ±44.7%, with 80% of held-out values landing inside the 95% band.

+30%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 →
4.7Projected 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 →
2.8–6.795% 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 →
±44.7%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 Great Basin is projected to rise about 30% by 2029 — from 3.6 in 2024 to a central estimate of 4.7 (95% range 2.8–6.7). A 5-year backtest shows a typical error of ±44.7%, with 80% 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 →
20254.62.76.6
20264.62.76.6
20274.72.76.6
20284.72.86.6
20294.72.86.7

Routes In Great Basin

Routes recording Savannah Sparrow in Great Basin.
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 →
ZumwaltOREGON552005
EwanWASHINGTON502019
AsotinWASHINGTON462024
Modoc PointOREGON432018
Bear RiverUTAH402023
DorrisCALIFORNIA382019
ReardanWASHINGTON382024
PicaboIDAHO362021
MaldenWASHINGTON362024
PrincetonOREGON351985
OdessaWASHINGTON312024
CallaoUTAH302024
Modoc Point 2OREGON292024
Crowley LakeCALIFORNIA252024
Green Mtn.OREGON232023
KeystoneWASHINGTON212024
WilburWASHINGTON202024
BlitzenOREGON181993
Ewan 2WASHINGTON182024
HarringtonWASHINGTON172012
ChinchaloOREGON162024
LikelyCALIFORNIA152024
JoelIDAHO152024
BickletonWASHINGTON152015
MacdoelCALIFORNIA132019

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