BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Song Sparrow In Great Basin

All regionsGreat BasinForest birds

Song Sparrow in Great Basin has increased: up 34% on the route-weighted index since 1970.

+34%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 →
216Routes 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 →
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 SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Song Sparrow in Great Basin. See the full index history below.

Song Sparrow In Great Basin Population Forecast

If the recent trend holds, Song Sparrow in Great Basin is projected to rise about 19% by 2030 — from 3.7 in 2025 to a central estimate of 4.4 (95% range 2.9–5.9). A 5-year backtest shows a typical error of ±19%, with 100% of held-out values landing inside the 95% band.

+19%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 →
4.4Projected 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 →
2.9–5.995% 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 →
±19%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, Song Sparrow in Great Basin is projected to rise about 19% by 2030 — from 3.7 in 2025 to a central estimate of 4.4 (95% range 2.9–5.9). A 5-year backtest shows a typical error of ±19%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20264.42.95.9
20274.42.95.9
20284.42.95.9
20294.42.95.9
20304.42.95.9

Routes In Great Basin

Routes recording Song 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 →
DorrisCALIFORNIA842019
WaitsburgWASHINGTON362004
ImnahaOREGON342025
Hardware RanchUTAH322023
DeltaUTAH302004
KendallWASHINGTON302025
Fish LakeOREGON292025
Meadow VallyNEVADA252025
Magic MtnIDAHO242025
GiffordIDAHO232017
LeavenworthWASHINGTON212024
Bear RiverUTAH192025
AlmoIDAHO172025
Modoc PointOREGON172018
NewhalemWASHINGTON162025
IndexWASHINGTON161971
MesaWASHINGTON162008
BakerIDAHO152024
Modoc Point 2OREGON152025
HyrumUTAH151979
TwispWASHINGTON142024
EwanWASHINGTON142019
MacdoelCALIFORNIA132019
Iron GateCALIFORNIA132019
JoelIDAHO132024

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