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

Loggerhead Shrike In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

Loggerhead Shrike in Southern Rockies / Colorado Plateau has collapsed: down 78% on the route-weighted index since 1970.

-78%Since 1970
109Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Loggerhead Shrike has collapsed in Southern Rockies / Colorado Plateau: down 78% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Loggerhead Shrike in Southern Rockies / Colorado Plateau is projected to fall about 91% by 2029 — from 0.69 in 2024 to a central estimate of 0.06 (95% range 0.00–1.0). A 5-year backtest shows a typical error of ±75.3%, with 100% of held-out values landing inside the 95% band.

-91%Change by 2029
0.06Projected 2029 index
0.00–1.095% range
±75.3%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
20250.160.001.1
20260.140.001.1
20270.110.001.1
20280.090.001.1
20290.060.001.0

Routes In Southern Rockies / Colorado Plateau

Routes recording Loggerhead Shrike in Southern Rockies / Colorado Plateau.
JensenUTAH112024
ShivwitzUTAH112024
Salt Lake 2NEW-MEXICO82023
BlandingUTAH82024
SeligmanARIZONA72024
Sybille CynWYOMING72024
HuntARIZONA62018
WestwaterUTAH62024
BasinCOLORADO52024
CanyonlandsUTAH52024
Cane Spr DesUTAH52011
Lake PowellUTAH52009
Gilson Butte 2UTAH52018
KaibitoARIZONA42019
NageesiNEW-MEXICO42024
La Plata 2NEW-MEXICO42016
HanksvilleUTAH42024
EscalanteUTAH42024
The GapARIZONA31976
Cow SpringsARIZONA32017
CorreoNEW-MEXICO31982
CounselorNEW-MEXICO32023
Corona EastNEW-MEXICO31995
Salt LakeNEW-MEXICO32001
Willow CreekUTAH32024

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