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

Broad-winged Hawk Population Trend in Indiana

All statesGeneralists

Broad-winged Hawk in Indiana has fallen sharply: down 72% on the route-weighted index since 1969.

-72%Since 1969TrendPercent 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 →
16Routes 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 →
41YearsYears 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 IndianaNotable 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 declinecomputed 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 fallen sharply in Indiana: down 72% on the route-weighted index since 1969.

Broad-winged Hawk Population Forecast in Indiana

If the recent trend holds, Broad-winged Hawk in Indiana is projected to stay roughly flat through 2028, near 0.02 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±47.5%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028TrendPercent 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 →
0.02Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0995% 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 →
±47.5%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 Indiana is projected to stay roughly flat through 2028, near 0.02 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±47.5%, with 100% of held-out values landing inside the 95% band.19662028
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 →
20240.020.000.09
20250.020.000.09
20260.020.000.09
20270.020.000.09
20280.020.000.09

Broad-winged Hawk Survey Routes in Indiana

Routes recording Broad-winged Hawk in Indiana.
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 →
Vevay219691966
Hoosier220231990
Spencer219921992
Cumback119971982
Indian Spgs119931993
Celestine120181980
Clear Spring120071985
New Phila120031986
Columbia Cty120042004
Corydon120011978
Indiana Dune120072007
Georgia120092000
Berne119761976
Anderson120052005
Belmont120161998
Milroy119821969

Broad-winged Hawk Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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