BirdAnalyst
Species · BCR 30 · BBS 2025 Release · 1966–2024

Double-crested Cormorant In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastWetland birds

Double-crested Cormorant in New England / Mid-Atlantic Coast has surged: up 25× on the route-weighted index since 1970.

25×Since 1970
111Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Double-crested Cormorant has surged in New England / Mid-Atlantic Coast: up 25× on the route-weighted index since 1970.

Forecast

If the recent trend holds, Double-crested Cormorant in New England / Mid-Atlantic Coast is projected to rise about 580% by 2029 — from 0.22 in 2024 to a central estimate of 1.5 (95% range 0.52–2.5). A 5-year backtest shows a typical error of ±127.7%, with 80% of held-out values landing inside the 95% band.

+580%Change by 2029
1.5Projected 2029 index
0.52–2.595% range
±127.7%Backtest error
19662029
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
20251.40.452.5
20261.50.462.5
20271.50.482.5
20281.50.502.5
20291.50.522.5

Routes In New England / Mid-Atlantic Coast

Routes recording Double-crested Cormorant in New England / Mid-Atlantic Coast.
MadisonMARYLAND562023
ShannockRHODE-ISLAND542023
PomfretMARYLAND301998
St. George'S IslandMARYLAND252017
Port RoyalVIRGINIA242019
ChilmarkMASSACHUSETTS221983
HughesvilleMARYLAND202009
NortheastMARYLAND202008
SharpsVIRGINIA132013
Cape CharlesVIRGINIA122018
NewburyportMASSACHUSETTS112022
PedricktownNEW-JERSEY102006
Chincoteag WVIRGINIA102022
LittletonMASSACHUSETTS92000
Ocean CityNEW-JERSEY82024
DanburyCONNECTICUT72013
FredericaDELAWARE62007
Block IslandRHODE-ISLAND62010
Cape Cod NsMASSACHUSETTS51996
WesthamptonNEW-YORK52006
Quonset PtRHODE-ISLAND52022
Mid HaddamCONNECTICUT42022
Bethany BchDELAWARE41990
BrocktonMASSACHUSETTS42018
Bennett MillNEW-JERSEY41998

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