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

Bobolink In Great Basin

All regionsGreat BasinGrassland birds

Bobolink in Great Basin has surged: up 95% on the route-weighted index since 1977.

+95%Since 1977TrendPercent 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 →
20Routes 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 →
49YearsYears 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 Bobolink in Great Basin. See the full index history below.

Bobolink In Great Basin Population Forecast

If the recent trend holds, Bobolink in Great Basin is projected to rise about 17% by 2030 — from 0.08 in 2025 to a central estimate of 0.10 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±99.8%, with 100% of held-out values landing inside the 95% band.

+17%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 →
0.10Projected 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 →
0.00–0.2495% 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 →
±99.8%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, Bobolink in Great Basin is projected to rise about 17% by 2030 — from 0.08 in 2025 to a central estimate of 0.10 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±99.8%, with 100% of held-out values landing inside the 95% band.19742030
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 →
20260.100.000.24
20270.100.000.24
20280.100.000.24
20290.100.000.24
20300.100.000.24

Routes In Great Basin

Routes recording Bobolink 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 →
NighthawkWASHINGTON92016
Fish LakeOREGON52025
JosephOREGON42016
Goose Creek Mtn.UTAH42025
BatesIDAHO32018
AlmoIDAHO32000
SpringfieldIDAHO22004
PocatelloIDAHO21996
Chimney Res.NEVADA22025
PrincetonOREGON21985
CedarvilleCALIFORNIA12016
BakerIDAHO12024
LeadoreIDAHO11981
CratersIDAHO11989
Dougal ResIDAHO11993
Cedar HillIDAHO12019
RanchograndeNEVADA12024
BlitzenOREGON11987
Timpie SpgUTAH11988
TonasketWASHINGTON12013

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