BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Pied-billed Grebe In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauWetland birds

Pied-billed Grebe in Southern Rockies / Colorado Plateau has held roughly steady: up 2% on the route-weighted index since 1972.

+2%Since 1972TrendPercent 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 →
35Routes 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 →
46YearsYears 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 Pied-billed Grebe in Southern Rockies / Colorado Plateau. See the full index history below.

Pied-billed Grebe In Southern Rockies / Colorado Plateau Population Forecast

If the recent trend holds, Pied-billed Grebe in Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2029, near 0.08 (95% range 0.00–0.16). A 5-year backtest shows a typical error of ±89.9%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.08Projected 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 →
0.00–0.1695% 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 →
±89.9%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, Pied-billed Grebe in Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2029, near 0.08 (95% range 0.00–0.16). A 5-year backtest shows a typical error of ±89.9%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.080.000.16
20260.080.000.16
20270.080.000.16
20280.080.000.16
20290.080.000.16

Routes In Southern Rockies / Colorado Plateau

Routes recording Pied-billed Grebe in Southern Rockies / Colorado Plateau.
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 →
CortezCOLORADO102008
Stinking Lk.NEW-MEXICO81996
M Warner ResUTAH62018
DulceNEW-MEXICO52019
BrookhurstWYOMING32019
WaldenCOLORADO22022
Rio Grnds RsCOLORADO22016
Steamboat L.COLORADO22002
Baxter PassCOLORADO22016
Cortez 2COLORADO22017
Main CanyonUTAH22017
Dixie NfUTAH22014
Douglas PassCOLORADO12022
DoloresCOLORADO11985
FalfaCOLORADO11997
Pagosa SpgsCOLORADO11976
DoylevilleCOLORADO12006
AlamosaCOLORADO12024
San LuisCOLORADO12024
Groundhog RsCOLORADO12018
PiedraCOLORADO12024
DinosaurCOLORADO12017
BasinCOLORADO12009
Mcphee Res.COLORADO12024
Yellowjacket PassCOLORADO12023

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