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Species · Utah · BBS 2026 Release · 1966–2025

Bewick's Wren Population Trend in Utah

All statesForest birds

Bewick's Wren in Utah has risen sharply: up 51% on the route-weighted index since 1981.

+51%Since 1981TrendPercent 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 →
59Routes 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 UtahNotable 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 risen sharply in Utah: up 51% on the route-weighted index since 1981.

Bewick's Wren Population Forecast in Utah

If the recent trend holds, Bewick's Wren in Utah is projected to fall about 36% by 2030 — from 0.87 in 2025 to a central estimate of 0.55 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±135.9%, with 100% of held-out values landing inside the 95% band.

-36%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 →
0.55Projected 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 →
0.00–1.195% 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 →
±135.9%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, Bewick's Wren in Utah is projected to fall about 36% by 2030 — from 0.87 in 2025 to a central estimate of 0.55 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±135.9%, with 100% of held-out values landing inside the 95% band.19722030
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 →
20260.550.001.1
20270.550.001.1
20280.550.001.1
20290.550.001.1
20300.550.001.1

Bewick's Wren Survey Routes in Utah

Routes recording Bewick's Wren in Utah.
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 →
Wellington 3920252016
Monticello920252025
Cane Spr Des819921992
Jericho Junction720252001
Fayette620252005
Blanding620252005
Arches Np520061996
Vernon520241992
Newcastle420251997
Alton420171997
Aneth320082008
Richfield320182000
Glen Canyon320232009
Westwater320241997
Tule Valley320251999
Jensen320002000
Bonanza319921992
Wah Wah320031989
Willow Creek220242000
Hanksville220232023
Navajo Lake220162016
Gooseberry220092003
Shivwitz220251992
Vernal220172003
La Sal 3220242007

Bewick's Wren Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoidahoillinoisindianaiowakansaskentuckymarylandmississippimissourinevadanew-mexiconorth-carolinaohiooklahomaoregonpennsylvaniatennesseetexasvirginiawashingtonwest-virginiawisconsinwyoming

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