BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Black-billed Magpie In Great Basin

All regionsGreat BasinGeneralists

Black-billed Magpie in Great Basin has declined: down 44% on the route-weighted index since 1970.

-44%Since 1970
210Routes In Region
56Years

Notable Signals

No notable trend signals for Black-billed Magpie in Great Basin. See the full index history below.

Forecast

If the recent trend holds, Black-billed Magpie in Great Basin is projected to rise about 16% by 2029 — from 6.6 in 2024 to a central estimate of 7.7 (95% range 4.3–11). A 5-year backtest shows a typical error of ±32.3%, with 100% of held-out values landing inside the 95% band.

+16%Change by 2029
7.7Projected 2029 index
4.3–1195% range
±32.3%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
20258.04.611
20267.94.511
20277.84.511
20287.84.411
20297.74.311

Routes In Great Basin

Routes recording Black-billed Magpie in Great Basin.
PocatelloIDAHO1102019
MesaWASHINGTON902008
LeadoreIDAHO792024
Cedar HillIDAHO712024
PicaboIDAHO652021
Toiyabe NfNEVADA602024
OthelloWASHINGTON591991
OrdnanceOREGON581979
Chimney Res.NEVADA552024
SpringfieldIDAHO542018
BakerIDAHO452024
BatesIDAHO432023
FallonNEVADA412024
YakimaWASHINGTON372024
Modoc PointOREGON362018
MacdoelCALIFORNIA352019
NighthawkWASHINGTON352024
Trout CreekOREGON342021
HarwoodWASHINGTON341997
AdrianOREGON312021
GardnervilleNEVADA262012
Modoc Point 2OREGON262024
CedarvilleCALIFORNIA242024
PrestonIDAHO242023
DeschutesOREGON242024

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