BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Black-billed Magpie In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

Black-billed Magpie in Southern Rockies / Colorado Plateau has edged down: down 11% on the route-weighted index since 1970.

-11%Since 1970
180Routes In Region
56Years

Notable Signals

No notable trend signals for Black-billed Magpie in Southern Rockies / Colorado Plateau. See the full index history below.

Forecast

If the recent trend holds, Black-billed Magpie in Southern Rockies / Colorado Plateau is projected to fall about 31% by 2029 — from 7.3 in 2024 to a central estimate of 5.1 (95% range 0.00–11). A 5-year backtest shows a typical error of ±20.3%, with 100% of held-out values landing inside the 95% band.

-31%Change by 2029
5.1Projected 2029 index
0.00–1195% range
±20.3%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
20255.60.0011
20265.50.0011
20275.30.0011
20285.20.0011
20295.10.0011

Routes In Southern Rockies / Colorado Plateau

Routes recording Black-billed Magpie in Southern Rockies / Colorado Plateau.
YampaCOLORADO1102023
HannaUTAH742024
KamasUTAH572024
AztecNEW-MEXICO541989
BufordCOLORADO452024
CastletonCOLORADO432024
Yellowjacket PassCOLORADO412024
FarmingtonNEW-MEXICO411987
AspenCOLORADO392024
Douglas PassCOLORADO362024
Stinking Lk.NEW-MEXICO351999
Deadman Rd.COLORADO322024
De BequeCOLORADO312024
Ojo SarcoNEW-MEXICO292024
Wilson CreekCOLORADO242024
Moon Lake 2UTAH242023
Rifle FallsCOLORADO232021
PaoniaCOLORADO222024
PowderhornCOLORADO222023
MoffatCOLORADO212024
Mcphee Res.COLORADO202024
DoloresCOLORADO191987
Fox CreekCOLORADO192024
AltonahUTAH192015
Hill CreekUTAH191995

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