BirdAnalyst
Species · BCR 14 · BBS 2025 Release · 1966–2024

Double-crested Cormorant In Atlantic Northern Forest

All regionsAtlantic Northern ForestWetland birds

Double-crested Cormorant in Atlantic Northern Forest has surged: up 93% on the route-weighted index since 1971.

+93%Since 1971
50Routes In Region
51Years

Notable Signals

long arc increasecomputed index

Double-crested Cormorant has surged in Atlantic Northern Forest: up 93% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Double-crested Cormorant in Atlantic Northern Forest is projected to rise about 27% by 2029 — from 0.13 in 2024 to a central estimate of 0.16 (95% range 0.00–0.51). A 5-year backtest shows a typical error of ±539.2%, with 100% of held-out values landing inside the 95% band.

+27%Change by 2029
0.16Projected 2029 index
0.00–0.5195% range
±539.2%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
20250.170.000.52
20260.170.000.51
20270.170.000.51
20280.170.000.51
20290.160.000.51

Routes In Atlantic Northern Forest

Routes recording Double-crested Cormorant in Atlantic Northern Forest.
DebloisMAINE582007
JeffersonMAINE212007
CornvilleMAINE142023
HancockMASSACHUSETTS122013
New HartfordCONNECTICUT111986
EastbrookMAINE71996
St DavidMAINE72005
PeterboroughNEW-HAMPSHIRE61975
CambridgeMAINE51982
RomeMAINE52005
New HartfordCONNECTICUT42003
HartfordMAINE42000
HancockMAINE42024
MedwayMAINE42014
ChesterfieldMASSACHUSETTS42013
MiddlesexVERMONT42011
FreedomMAINE31975
HarmonyMAINE32024
HermonMAINE31983
CastineMAINE32006
MilanNEW-HAMPSHIRE32023
GreenwoodMAINE22009
ManchesterMAINE21983
BrooksMAINE21985
MarlowNEW-HAMPSHIRE21992

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