BirdAnalyst
Species · Oregon · BBS 2025 Release · 1966–2024

Loggerhead Shrike Population Trend in Oregon

All statesGeneralists

Loggerhead Shrike in Oregon has held roughly steady: down 3% on the route-weighted index since 1970.

-3%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 →
37Routes 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 →
56YearsYears 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 2029, near 0.56 (95% range 0.21–0.92). A 5-year backtest shows a typical error of ±19.5%, with 100% of held-out values landing inside the 95% band.

-6%Change by 2029TrendPercent 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 →
0.56Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.21–0.9295% 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 →
±19.5%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 2029, near 0.56 (95% range 0.21–0.92). A 5-year backtest shows a typical error of ±19.5%, with 100% of held-out values landing inside the 95% band.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 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 →
20250.560.200.91
20260.560.200.91
20270.560.210.91
20280.560.210.92
20290.560.210.92

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
Mikkalo1120231996
Malheur Nwr920221986
Bowden Hills820241999
Alvord Lake620241968
Crooked Riv.620191994
Trout Creek620211996
Madras520241997
Blitzen 2420241994
Fandango Can420241977
Warner Vally420241993
Lone Rock320192015
Buchanan220181976
Crowley220241983
Willow Spg219711969
Joseph219791979
Eightmile220211991
Clover Creek220211972
Princeton219851972
Adrian220181984
Green Mtn.220241995
Crane220241993
Sheaville220222013
Flook Lake220161996
Three Forks120242003

Loggerhead Shrike Population Trend in Other States

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

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