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Species · BCR 4 · BBS 2026 Release · 1966–2025

Lesser Yellowlegs In BCR 4

All regionsBCR 4Shorebirds

Lesser Yellowlegs in BCR 4 has declined: down 26% on the route-weighted index since 1982.

-26%Since 1982TrendPercent 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 →
61Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
45YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Lesser Yellowlegs in BCR 4. See the full index history below.

Lesser Yellowlegs In BCR 4 Population Forecast

If the recent trend holds, Lesser Yellowlegs in BCR 4 is projected to fall about 16% by 2030 — from 1.4 in 2025 to a central estimate of 1.2 (95% range 0.00–3.8). A 5-year backtest shows a typical error of ±17.4%, with 100% of held-out values landing inside the 95% band.

-16%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 →
1.2Projected 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 →
0.00–3.895% 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 →
±17.4%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, Lesser Yellowlegs in BCR 4 is projected to fall about 16% by 2030 — from 1.4 in 2025 to a central estimate of 1.2 (95% range 0.00–3.8). A 5-year backtest shows a typical error of ±17.4%, 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 →
20261.40.004.0
20271.30.003.9
20281.30.003.9
20291.20.003.8
20301.20.003.8

Routes In BCR 4

Routes recording Lesser Yellowlegs in BCR 4.
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 →
Nicholai SlALASKA122025
Lake LouiseALASKA102025
Bear CreekALASKA91991
Mud RiverALASKA92024
Kenny LakeALASKA82004
Pinoche Tral (Short)ALASKA81984
CantwellALASKA72025
SourdoughALASKA72025
Koyukuk Riv.ALASKA62001
Kanuti LakeALASKA62024
Paxson LakeALASKA61997
ChistochinaALASKA42025
Chena RiverALASKA41988
Hather CreekALASKA42024
Mccarthy Rd2ALASKA41999
McgrathALASKA32022
Porcupine R.ALASKA32002
Kobuk River (Short)ALASKA31992
Galena (Short)ALASKA32025
EagleALASKA22008
CircleALASKA22024
MaclarenALASKA22024
MonahanALASKA22025
Goose BayALASKA21982
HomerALASKA21982

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