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Species · Oregon · BBS 2025 Release · 1966–2024

Clark's Grebe Population Trend in Oregon

All statesWetland birds

Clark's Grebe in Oregon has increased: up 38% on the route-weighted index since 1989.

+38%Since 1989TrendPercent 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 →
6Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
32YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Clark's Grebe Trends in OregonNotable 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 Oregon. See the full index history below.

Clark's Grebe Population Forecast in Oregon

If the recent trend holds, Clark's Grebe in Oregon is projected to rise about 137% by 2029 — from 0.15 in 2024 to a central estimate of 0.36 (95% range 0.00–0.92). A 5-year backtest shows a typical error of ±885.7%, with 100% of held-out values landing inside the 95% band.

+137%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 →
0.36Projected 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 →
0.00–0.9295% 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 →
±885.7%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 Oregon is projected to rise about 137% by 2029 — from 0.15 in 2024 to a central estimate of 0.36 (95% range 0.00–0.92). A 5-year backtest shows a typical error of ±885.7%, 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 →
20250.340.000.90
20260.340.000.91
20270.350.000.91
20280.350.000.92
20290.360.000.92

Clark's Grebe Survey Routes in Oregon

Routes recording Clark's Grebe in Oregon.
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 →
Warner Vally1420241994
Catlow Rim220192019
Blizzard Gap219991999
Tualatin120182018
Malheur Nwr119911991
Modoc Point120141986

Clark's Grebe Population Trend in Other States

arizonacaliforniacoloradoidahomontananebraskanevadanorth-dakotasouth-dakotautahwyoming

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