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Species · Utah · BBS 2025 Release · 1966–2024

Black-billed Magpie Population Trend in Utah

All statesGeneralists

Black-billed Magpie in Utah has fallen sharply: down 60% on the route-weighted index since 1970.

-60%Since 1970
90Routes In State
56Years

Notable Black-billed Magpie Trends in Utah

long arc declinecomputed index

Black-billed Magpie has fallen sharply in Utah: down 60% on the route-weighted index since 1970.

Black-billed Magpie Population Forecast in Utah

If the recent trend holds, Black-billed Magpie in Utah is projected to fall about 36% by 2029 — from 5.5 in 2024 to a central estimate of 3.5 (95% range 0.00–9.0). A 5-year backtest shows a typical error of ±19.9%, with 100% of held-out values landing inside the 95% band.

-36%Change by 2029
3.5Projected 2029 index
0.00–9.095% range
±19.9%Backtest error
19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20253.90.009.3
20263.80.009.2
20273.70.009.1
20283.60.009.1
20293.50.009.0

Black-billed Magpie Survey Routes in Utah

Routes recording Black-billed Magpie in Utah.
Hanna7420241997
Kamas5720241997
Woodruff5620242002
Moon Lake 22420232004
Randolph2120241992
Altonah1920151968
Hill Creek1919951993
Neponset Res1720181995
Hardware Ranch1620231994
Heber Mtn.1520242003
Promontory1420241969
Lost Cr. Res1420181995
Wellington 31320242012
Castleton1319851969
Saleratus Cr1220181995
Delta1120241987
E. Bear Lake1120221995
Wellington 21120112003
Leamington1020171992
Salt Springs920241986
Goshen920241968
Notom920241991
Gooseberry920241994
Goose Creek Mtn.820231998
Vernal820182003

Black-billed Magpie Population Trend in Other States

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