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

Common Loon Population Trend in Wisconsin

All statesWetland birds

Common Loon in Wisconsin has edged up: up 20% on the route-weighted index since 1968.

+20%Since 1968
47Routes In State
58Years

Notable Common Loon Trends in Wisconsin

No notable trend signals for Common Loon in Wisconsin. See the full index history below.

Common Loon Population Forecast in Wisconsin

If the recent trend holds, Common Loon in Wisconsin is projected to rise about 51% by 2029 — from 0.43 in 2024 to a central estimate of 0.65 (95% range 0.29–1.0). A 5-year backtest shows a typical error of ±75.3%, with 80% of held-out values landing inside the 95% band.

+51%Change by 2029
0.65Projected 2029 index
0.29–1.095% range
±75.3%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
20250.640.281.00
20260.640.291.0
20270.650.291.0
20280.650.291.0
20290.650.291.0

Common Loon Survey Routes in Wisconsin

Routes recording Common Loon in Wisconsin.
Conover620241998
Loraine520181966
Land O' Lakes 2420242017
Grand View320241967
Land O Lakes320161967
Union Twp320231968
Weyerhauser320241969
Cadott320112011
Oconto Falls320231969
Flambeau320241999
Hudson220241997
Dresser220211966
Couderay220191969
Gilman220241987
Irma220231967
Mcnaughton220241966
Eagle River220241966
Popple River220241966
Crandon220241967
Hatfield219951995
Mather220131995
Elderon220212021
Rhinelander220221998
Chaffey120132000
Iron River120241971

Common Loon Population Trend in Other States

alaskaidahomainemassachusettsmichiganminnesotamontananew-hampshirenew-yorknorth-dakotaoregonvermontwashingtonwyoming

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