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

Clark's Grebe In Great Basin

All regionsGreat BasinWetland birds

Clark's Grebe in Great Basin has held roughly steady: down 4% on the route-weighted index since 1988.

-4%Since 1988TrendPercent 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 →
24Routes 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 →
38YearsYears 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 Clark's Grebe in Great Basin. See the full index history below.

Clark's Grebe In Great Basin Population Forecast

If the recent trend holds, Clark's Grebe in Great Basin is projected to rise about 379% by 2029 — from 0.10 in 2024 to a central estimate of 0.48 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±295.1%, with 100% of held-out values landing inside the 95% band.

+379%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 →
0.48Projected 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 →
0.00–1.195% 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 →
±295.1%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, Clark's Grebe in Great Basin is projected to rise about 379% by 2029 — from 0.10 in 2024 to a central estimate of 0.48 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±295.1%, with 100% of held-out values landing inside the 95% band.19862029
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 →
20250.470.001.1
20260.470.001.1
20270.470.001.1
20280.470.001.1
20290.480.001.1

Routes In Great Basin

Routes recording Clark's Grebe 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 →
Bear RiverUTAH192023
Bald Mtn.NEVADA142000
Warner VallyOREGON142024
DorrisCALIFORNIA112019
Iron GateCALIFORNIA112019
Dobbin CreekNEVADA112008
NubieberCALIFORNIA31999
MadelineCALIFORNIA32019
Cedar HillIDAHO32005
IngallsCALIFORNIA21999
Daniels ResIDAHO22000
Blizzard GapOREGON21999
Catlow RimOREGON22019
GoshenUTAH22012
LikelyCALIFORNIA12014
Clear Lk ResCALIFORNIA12017
Crowder FlatCALIFORNIA12011
RirieIDAHO12011
Pasadena ValIDAHO12011
PrestonIDAHO11990
Modoc PointOREGON12014
Malheur NwrOREGON11991
LynnUTAH12021
CallaoUTAH12013

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