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

Boat-tailed Grackle In Mississippi Alluvial Valley

All regionsMississippi Alluvial ValleyGeneralists

Boat-tailed Grackle in Mississippi Alluvial Valley has fallen sharply: down 73% on the route-weighted index since 1976.

-73%Since 1976
13Routes In Region
35Years

Notable Signals

long arc declinecomputed index

Boat-tailed Grackle has fallen sharply in Mississippi Alluvial Valley: down 73% on the route-weighted index since 1976.

Forecast

If the recent trend holds, Boat-tailed Grackle in Mississippi Alluvial Valley is projected to rise about 69% by 2029 — from 0.33 in 2024 to a central estimate of 0.56 (95% range 0.00–1.7). A 5-year backtest shows a typical error of ±826.9%, with 100% of held-out values landing inside the 95% band.

+69%Change by 2029
0.56Projected 2029 index
0.00–1.795% range
±826.9%Backtest error
19682029
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
20250.560.001.7
20260.560.001.7
20270.560.001.7
20280.560.001.7
20290.560.001.7

Routes In Mississippi Alluvial Valley

Routes recording Boat-tailed Grackle in Mississippi Alluvial Valley.
BerwickLOUISIANA392018
GibsonLOUISIANA262019
LaroseLOUISIANA141992
FreetownLOUISIANA71987
River RoadLOUISIANA72024
KeystoneLOUISIANA61992
CarlisleLOUISIANA51988
Morgan CityLOUISIANA31976
KraemerLOUISIANA22024
MayflowerLOUISIANA11971
RamahLOUISIANA12024
BelairLOUISIANA12024
Morgan CityLOUISIANA12013

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