BirdAnalyst
Species · Oregon · BBS 2026 Release · 1966–2025

Loggerhead Shrike Population Trend in Oregon

All statesGrassland birds

Loggerhead Shrike in Oregon has held roughly steady: up 2% on the route-weighted index since 1970.

+2%Since 1970TrendPercent 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 →
38Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Loggerhead Shrike Trends in OregonNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Loggerhead Shrike in Oregon. See the full index history below.

Loggerhead Shrike Population Forecast in Oregon

If the recent trend holds, Loggerhead Shrike in Oregon is projected to stay roughly flat through 2030, near 0.57 (95% range 0.22–0.92). A 5-year backtest shows a typical error of ±16.2%, with 100% of held-out values landing inside the 95% band.

-1%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 →
0.57Projected 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 →
0.22–0.9295% 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 →
±16.2%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, Loggerhead Shrike in Oregon is projected to stay roughly flat through 2030, near 0.57 (95% range 0.22–0.92). A 5-year backtest shows a typical error of ±16.2%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20260.560.210.91
20270.560.210.91
20280.560.210.91
20290.570.220.92
20300.570.220.92

Loggerhead Shrike Survey Routes in Oregon

Routes recording Loggerhead Shrike in Oregon.
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 →
Harney Lake1620241993
Malheur Nwr920221986
Three Forks720252003
Mikkalo520251996
Blitzen 2420251994
Alvord Lake420251968
Madras420251997
Warner Vally420241993
Catlow Rim420251994
Bowden Hills420251999
Sheaville420252013
Lone Rock320192015
Clover Creek320251972
Flook Lake320251996
Trout Creek320251996
Buchanan220251976
Crowley220251983
Willow Spg219711969
Joseph219791979
Princeton219851972
Green Mtn.220241995
Crane220241993
Ordnance119791975
Deschutes120241968
Fandango Can120251977

Loggerhead Shrike Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradofloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanevadanew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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