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

Western Meadowlark In Great Basin

All regionsGreat BasinGrassland birds

Western Meadowlark in Great Basin has held roughly steady: down 7% on the route-weighted index since 1970.

-7%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 →
246Routes 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 →

No notable trend signals for Western Meadowlark in Great Basin. See the full index history below.

Forecast

If the recent trend holds, Western Meadowlark in Great Basin is projected to stay roughly flat through 2029, near 44 (95% range 25–63). A 5-year backtest shows a typical error of ±21.2%, with 100% of held-out values landing inside the 95% band.

+1%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 →
44Projected 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 →
25–6395% 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 →
±21.2%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, Western Meadowlark in Great Basin is projected to stay roughly flat through 2029, near 44 (95% range 25–63). A 5-year backtest shows a typical error of ±21.2%, 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 →
2025452664
2026452663
2027442663
2028442563
2029442563

Routes In Great Basin

Routes recording Western Meadowlark 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 →
Arid Land ErWASHINGTON2921996
SnowvilleUTAH2612024
Glenns FerryIDAHO2581986
ZumwaltOREGON2562005
Hanford SiteWASHINGTON2321996
Honey LakeCALIFORNIA2312024
OthelloWASHINGTON2221991
SheavilleOREGON2212024
Clear Lk ResCALIFORNIA1842018
OreanaNEVADA1762003
GoshenUTAH1602024
PromontoryUTAH1502024
Alvord LakeOREGON1432024
Willow SpgOREGON1381971
MidasNEVADA1362024
Chimney Res.NEVADA1362024
Harney LakeOREGON1312024
Toiyabe NfNEVADA1292024
DuboisIDAHO1272024
Catlow RimOREGON1252024
Three ForksOREGON1202024
CareyIDAHO1192018
Davis CreekCALIFORNIA1182024
Timpie SpgUTAH1152003
RichlandWASHINGTON1132024

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