BirdAnalyst
Species · Maine · BBS 2025 Release · 1966–2024

Common Loon Population Trend in Maine

All statesWetland birds

Common Loon in Maine has surged: up 111% on the route-weighted index since 1968.

+111%Since 1968
65Routes In State
57Years

Notable Common Loon Trends in Maine

long arc increasecomputed index

Common Loon has surged in Maine: up 111% on the route-weighted index since 1968.

Common Loon Population Forecast in Maine

If the recent trend holds, Common Loon in Maine is projected to fall about 23% by 2029 — from 1.4 in 2024 to a central estimate of 1.1 (95% range 0.61–1.6). A 5-year backtest shows a typical error of ±19.3%, with 100% of held-out values landing inside the 95% band.

-23%Change by 2029
1.1Projected 2029 index
0.61–1.695% range
±19.3%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
20251.10.571.6
20261.10.581.6
20271.10.591.6
20281.10.601.6
20291.10.611.6

Common Loon Survey Routes in Maine

Routes recording Common Loon in Maine.
Kittery Pt720241986
Lake Moxie720222006
Seboomook Lk620141972
St David620041985
Newcastle420081971
Eastbrook420241971
Carrying Pl420241979
Wilson Mills320241984
Greenwood320241972
Northfield319811976
Weeks Brook320161996
Reeds220142014
Harmony220241970
Brooks220171977
Castine220051976
Cooper220191975
Greenville220221976
Grnd Lk Strm220001966
Clayton Lake220011984
Ludlow219961986
Horse Mtn220111983
Cornville220242012
Telos220061995
Priestly Br.219981995
Baker Lake220091995

Common Loon Population Trend in Other States

alaskaidahomassachusettsmichiganminnesotamontananew-hampshirenew-yorknorth-dakotaoregonvermontwashingtonwisconsinwyoming

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