BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Great Blue Heron In Great Basin

All regionsGreat BasinWetland birds

Great Blue Heron in Great Basin has held roughly steady: up 9% on the route-weighted index since 1970.

+9%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 →
148Routes 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 →
57YearsYears 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 Great Blue Heron in Great Basin. See the full index history below.

Great Blue Heron In Great Basin Population Forecast

If the recent trend holds, Great Blue Heron in Great Basin is projected to rise about 62% by 2030 — from 0.40 in 2025 to a central estimate of 0.64 (95% range 0.15–1.1). A 5-year backtest shows a typical error of ±80.7%, with 100% of held-out values landing inside the 95% band.

+62%Change by 2030TrendPercent 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 →
0.64Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.15–1.195% 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 →
±80.7%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, Great Blue Heron in Great Basin is projected to rise about 62% by 2030 — from 0.40 in 2025 to a central estimate of 0.64 (95% range 0.15–1.1). A 5-year backtest shows a typical error of ±80.7%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20260.650.161.1
20270.650.151.1
20280.650.151.1
20290.650.151.1
20300.640.151.1

Routes In Great Basin

Routes recording Great Blue Heron 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 →
Iron GateCALIFORNIA242019
Modoc Point 2OREGON212025
BakerIDAHO82024
PrestonIDAHO62023
OthelloWASHINGTON61991
DorrisCALIFORNIA42019
Clear Lk ResCALIFORNIA42018
CratersIDAHO41988
Pasadena ValIDAHO42015
BatesIDAHO42019
Davis LakeOREGON42024
Malheur NwrOREGON41998
Crowder FlatCALIFORNIA32017
Cedar HillIDAHO32022
Rye PatchNEVADA31974
GardnervilleNEVADA32006
Ruby Valley 2NEVADA32024
Modoc PointOREGON32018
JosephOREGON32025
PrincetonOREGON31985
Fish LakeOREGON32025
PromontoryUTAH32024
ReardanWASHINGTON32021
OdessaWASHINGTON32023
YakimaWASHINGTON32025

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.