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Species · BCR 10 · BBS 2025 Release · 1966–2024

Clark's Grebe In Northern Rockies

All regionsNorthern RockiesWetland birds

Clark's Grebe in Northern Rockies has fallen sharply: down 59% on the route-weighted index since 1996.

-59%Since 1996TrendPercent 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 →
15Routes 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 →
23YearsYears 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 Northern Rockies. See the full index history below.

Clark's Grebe In Northern Rockies Population Forecast

If the recent trend holds, Clark's Grebe in Northern Rockies is projected to stay roughly flat through 2028, near 0.03 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±831.8%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028TrendPercent 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 →
0.03Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1395% 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 →
±831.8%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, Clark's Grebe in Northern Rockies is projected to stay roughly flat through 2028, near 0.03 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±831.8%, with 100% of held-out values landing inside the 95% band.19882028
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 →
20240.030.000.13
20250.030.000.13
20260.030.000.13
20270.030.000.13
20280.030.000.13

Routes In Northern Rockies

Routes recording Clark's Grebe in Northern Rockies.
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 →
Crazy WomanWYOMING52004
Rock RiverWYOMING51999
Neponset ResUTAH22016
MooseWYOMING21990
AlpineWYOMING22005
CabartonIDAHO11988
FeathervilleIDAHO11990
Painted RockMONTANA12002
Hebgen LakeMONTANA12023
Saleratus CrUTAH12011
E. Bear LakeUTAH12001
FontenelleWYOMING12002
Fiddler LkWYOMING12001
WalcottWYOMING12001
YellowstoneWYOMING12021

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