BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Great Blue Heron In Sierra Nevada

All regionsSierra NevadaWetland birds

Great Blue Heron in Sierra Nevada has edged down: down 15% on the route-weighted index since 1976.

-15%Since 1976
18Routes In Region
35Years

Notable Signals

No notable trend signals for Great Blue Heron in Sierra Nevada. See the full index history below.

Forecast

If the recent trend holds, Great Blue Heron in Sierra Nevada is projected to fall about 35% by 2029 — from 0.16 in 2024 to a central estimate of 0.10 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±103.3%, with 100% of held-out values landing inside the 95% band.

-35%Change by 2029
0.10Projected 2029 index
0.00–0.2595% range
±103.3%Backtest error
19732029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.100.000.25
20260.100.000.25
20270.100.000.25
20280.100.000.25
20290.100.000.25

Routes In Sierra Nevada

Routes recording Great Blue Heron in Sierra Nevada.
Bass LakeCALIFORNIA42009
SattleyCALIFORNIA21992
Butte MeadowCALIFORNIA21995
LakeshoreCALIFORNIA22009
PaxtonCALIFORNIA22024
Eagle LakeCALIFORNIA12006
JohnsvilleCALIFORNIA11990
LumberyardCALIFORNIA12019
Silver CityCALIFORNIA12010
Kings CanyonCALIFORNIA11987
Tuolumne GroveCALIFORNIA12016
GeneseeCALIFORNIA12013
Higgins CornCALIFORNIA12003
DownievilleCALIFORNIA11984
Hat CreekCALIFORNIA12007
Chaos CraterCALIFORNIA11993
CoultervilleCALIFORNIA12013
WawonaCALIFORNIA12024

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