BirdAnalyst
Species · BCR 26 · BBS 2025 Release · 1966–2024

Great Blue Heron In Mississippi Alluvial Valley

All regionsMississippi Alluvial ValleyWetland birds

Great Blue Heron in Mississippi Alluvial Valley has surged: up 639% on the route-weighted index since 1969.

+639%Since 1969
69Routes In Region
57Years

Notable Signals

long arc increasecomputed index

Great Blue Heron has surged in Mississippi Alluvial Valley: up 639% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Great Blue Heron in Mississippi Alluvial Valley is projected to rise about 264% by 2029 — from 1.1 in 2024 to a central estimate of 4.0 (95% range 0.00–8.2). A 5-year backtest shows a typical error of ±242.3%, with 100% of held-out values landing inside the 95% band.

+264%Change by 2029
4.0Projected 2029 index
0.00–8.295% range
±242.3%Backtest error
19672029
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
20253.90.008.1
20263.90.008.1
20273.90.008.1
20283.90.008.1
20294.00.008.2

Routes In Mississippi Alluvial Valley

Routes recording Great Blue Heron in Mississippi Alluvial Valley.
Tchula 2MISSISSIPPI171994
HarrisburgARKANSAS92012
KraemerLOUISIANA72023
PawpawTENNESSEE72012
EnglandARKANSAS62024
BardwellKENTUCKY62003
FreetownLOUISIANA62009
Morgan CityLOUISIANA61986
AtchafalayaLOUISIANA62019
DundeeMISSISSIPPI62022
HaytiMISSOURI62021
IsolaMISSISSIPPI52022
Eagle LakeMISSISSIPPI52024
Delta N.F.MISSISSIPPI52018
RayvilleLOUISIANA42007
Morgan CityLOUISIANA42022
River RoadLOUISIANA42021
Panther Swamp NwrMISSISSIPPI42018
DeventerMISSOURI42023
Cp GirardeauMISSOURI42024
South BendARKANSAS32023
SaffellARKANSAS32019
MaynardARKANSAS32024
BelairLOUISIANA32024
BerwickLOUISIANA32018

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