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Species · Nevada · BBS 2026 Release · 1966–2025

Bewick's Wren Population Trend in Nevada

All statesForest birds

Bewick's Wren in Nevada has surged: up 13× on the route-weighted index since 1971.

13×Since 1971TrendPercent 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 →
28Routes 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 →
43YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bewick's Wren Trends in NevadaNotable 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 →

Bewick's Wren has surged in Nevada: up 13× on the route-weighted index since 1971.

Bewick's Wren Population Forecast in Nevada

If the recent trend holds, Bewick's Wren in Nevada is projected to fall about 40% by 2030 — from 2.2 in 2025 to a central estimate of 1.3 (95% range 0.11–2.5). A 5-year backtest shows a typical error of ±32.3%, with 100% of held-out values landing inside the 95% band.

-40%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 →
1.3Projected 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 →
0.11–2.595% 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 →
±32.3%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, Bewick's Wren in Nevada is projected to fall about 40% by 2030 — from 2.2 in 2025 to a central estimate of 1.3 (95% range 0.11–2.5). A 5-year backtest shows a typical error of ±32.3%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20261.30.042.5
20271.30.062.5
20281.30.082.5
20291.30.102.5
20301.30.112.5

Bewick's Wren Survey Routes in Nevada

Routes recording Bewick's Wren in Nevada.
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 →
Sand Pass1120251989
Caliente1120251988
Meadow Vally1020251996
Gardnerville1020121992
Ash Meadows620251993
Rye Patch519871987
Toiyabe Nf420032003
Calico Spr319691969
Chimney Res.320252013
Gardnerville 2320252013
Hawthorne320012001
Ranchogrande220242009
Illipah220211997
Hiko220231972
Beatty220241993
Jean Lake220131973
Jarbidge220132007
Piute Mdws120192019
Desert Nwr119931993
Dinner Sta119681968
Fish Creek120211999
Carson River120052001
Virgin Creek120172017
Dobbin Creek120001971
Willis120091994

Bewick's Wren Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoidahoillinoisindianaiowakansaskentuckymarylandmississippimissourinew-mexiconorth-carolinaohiooklahomaoregonpennsylvaniatennesseetexasutahvirginiawashingtonwest-virginiawisconsinwyoming

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