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

Olive-sided Flycatcher Population Trend in Wisconsin

All statesAerial insectivores

Olive-sided Flycatcher in Wisconsin has collapsed: down 81% on the route-weighted index since 1968.

-81%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 →
41Routes 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 →
47YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Olive-sided Flycatcher 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 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 →

Olive-sided Flycatcher has collapsed in Wisconsin: down 81% on the route-weighted index since 1968.

Olive-sided Flycatcher Population Forecast in Wisconsin

If the recent trend holds, Olive-sided Flycatcher in Wisconsin is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±85%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.01Projected 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 →
0.00–0.0895% 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 →
±85%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, Olive-sided Flycatcher in Wisconsin is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±85%, 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 →
20250.020.000.08
20260.020.000.08
20270.010.000.08
20280.010.000.08
20290.010.000.08

Olive-sided Flycatcher Survey Routes in Wisconsin

Routes recording Olive-sided Flycatcher 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 →
Union Twp319861985
Minong220041983
Exeland219881972
Stetsonville219971994
Chaffey120151968
Iron River119931967
Grand View119931977
Bayfield119941967
Shanagolden120051977
Montreal120211977
Land O Lakes120021979
Hudson119701970
Dresser119681968
Loraine120091974
Cumberland120052005
Weyerhauser119661966
Couderay120092009
Gilman120152009
Phillips119971993
Rib Lake119951986
Irma120092009
Mcnaughton119971970
Eagle River120041968
Popple River119951971
Crandon119811981

Olive-sided Flycatcher Population Trend in Other States

alaskaarizonacaliforniacoloradoidahomainemarylandmassachusettsmichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorknorth-carolinaohiooregonpennsylvaniasouth-dakotautahvermontwashingtonwest-virginiawyoming

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