BirdAnalyst
Species · Wisconsin · BBS 2026 Release · 1966–2025

Brown Creeper Population Trend in Wisconsin

All statesForest birds

Brown Creeper in Wisconsin has surged: up 232% on the route-weighted index since 1969.

+232%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 →
40Routes 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 Brown Creeper 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 →

Brown Creeper has surged in Wisconsin: up 232% on the route-weighted index since 1969.

Brown Creeper Population Forecast in Wisconsin

If the recent trend holds, Brown Creeper in Wisconsin is projected to fall about 20% by 2030 — from 0.23 in 2025 to a central estimate of 0.18 (95% range 0.09–0.27). A 5-year backtest shows a typical error of ±34.3%, with 100% of held-out values landing inside the 95% band.

-20%Change by 2030TrendPercent 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 →
0.18Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.09–0.2795% 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 →
±34.3%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, Brown Creeper in Wisconsin is projected to fall about 20% by 2030 — from 0.23 in 2025 to a central estimate of 0.18 (95% range 0.09–0.27). A 5-year backtest shows a typical error of ±34.3%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.170.080.26
20270.180.090.27
20280.180.090.27
20290.180.090.27
20300.180.090.27

Brown Creeper Survey Routes in Wisconsin

Routes recording Brown Creeper 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 →
Land O' Lakes 2720252017
Land O Lakes420161967
Popple River420251976
Montreal220241988
Eagle River220241966
Cavour220252000
Chaffey120131993
Iron River120192007
Grand View120241972
Bayfield120162012
Shanagolden120211979
Union Twp119841984
Loraine119671967
Weyerhauser120192004
Couderay120141974
Rib Lake120152012
Merrill120231991
Irma120231973
Mcnaughton120121973
Crandon120221967
Hollister120251980
Amberg120251982
Wausaukee120231981
Washington I120251998
Esdaile119971996

Brown Creeper Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutidahoillinoisindianaiowamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.