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

Herring Gull Population Trend in Wisconsin

All statesWetland birds

Herring Gull in Wisconsin has collapsed: down 83% on the route-weighted index since 1968.

-83%Since 1968
23Routes In State
58Years

Notable Herring Gull Trends in Wisconsin

long arc declinecomputed index

Herring Gull has collapsed in Wisconsin: down 83% on the route-weighted index since 1968.

Herring Gull Population Forecast in Wisconsin

If the recent trend holds, Herring Gull in Wisconsin is projected to fall about 100% by 2029 — from 2.6 in 2024 to a central estimate of 0.00 (95% range 0.00–4.7). A 5-year backtest shows a typical error of ±206.2%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–4.795% range
±206.2%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
20250.000.004.7
20260.000.004.7
20270.000.004.7
20280.000.004.7
20290.000.004.7

Herring Gull Survey Routes in Wisconsin

Routes recording Herring Gull in Wisconsin.
Manitowoc18420241978
Washington I1920241967
Bayfield1319991968
Iron River420241967
Manawa419881988
Montreal219921983
Cochrane220051981
Elderon219821982
Pt Washingtn220171969
Chaffey119881988
Hudson119811981
Dresser119751975
Couderay119821982
Omro 2120212002
Wis Rapids119941994
Oconto Falls119911991
Omro120011968
Casco120241966
Grimms120212004
Brownsville120112011
Rolling Pr119861986
Mount Horeb119841984
Raymond120242004

Herring Gull Population Trend in Other States

alabamaalaskacaliforniacoloradoconnecticutdelawarefloridaidahoillinoisindianakansaslouisianamainemarylandmassachusettsmichiganminnesotamontananew-hampshirenew-jerseynew-yorknorth-carolinaohiooregonpennsylvaniarhode-islandsouth-carolinatexasvermontvirginiawashingtonwest-virginia

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