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

Broad-winged Hawk Population Trend in Wisconsin

All statesGeneralists

Broad-winged Hawk in Wisconsin has surged: up 90% on the route-weighted index since 1968.

+90%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
62Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Broad-winged Hawk Trends in WisconsinNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Broad-winged Hawk has surged in Wisconsin: up 90% on the route-weighted index since 1968.

Broad-winged Hawk Population Forecast in Wisconsin

If the recent trend holds, Broad-winged Hawk in Wisconsin is projected to fall about 31% by 2029 — from 0.27 in 2024 to a central estimate of 0.19 (95% range 0.03–0.34). A 5-year backtest shows a typical error of ±22.9%, with 100% of held-out values landing inside the 95% band.

-31%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.19Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.03–0.3495% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±22.9%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Broad-winged Hawk in Wisconsin is projected to fall about 31% by 2029 — from 0.27 in 2024 to a central estimate of 0.19 (95% range 0.03–0.34). A 5-year backtest shows a typical error of ±22.9%, with 100% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.190.030.35
20260.190.030.35
20270.190.030.35
20280.190.030.34
20290.190.030.34

Broad-winged Hawk Survey Routes in Wisconsin

Routes recording Broad-winged Hawk in Wisconsin.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Irma420241968
Minong220191976
Grand View220231966
Shanagolden220241977
Land O Lakes220151967
Cumberland220241972
Rib Lake220171969
Amberg220241983
Unity219981972
Elderon220021968
Casco219761967
Bashaw220152002
Flambeau220242010
Cavour220231998
Land O' Lakes 2220242017
Stetsonville220241993
Chaffey120241972
Iron River120241974
Bayfield120241967
Montreal120221975
Hudson119911991
Dresser120221998
Union Twp120221981
Loraine120041990
Weyerhauser120242008

Broad-winged Hawk Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawyoming

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