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

Greater Yellowlegs In BCR 4

All regionsBCR 4Shorebirds

Greater Yellowlegs in BCR 4 has fallen sharply: down 60% on the route-weighted index since 1982.

-60%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 →
30Routes 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Greater Yellowlegs has fallen sharply in BCR 4: down 60% on the route-weighted index since 1982.

Greater Yellowlegs In BCR 4 Population Forecast

If the recent trend holds, Greater Yellowlegs in BCR 4 is projected to fall about 97% by 2030 — from 0.51 in 2025 to a central estimate of 0.01 (95% range 0.00–0.91). A 5-year backtest shows a typical error of ±77.4%, with 100% of held-out values landing inside the 95% band.

-97%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 →
0.01Projected 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 →
0.00–0.9195% 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 →
±77.4%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, Greater Yellowlegs in BCR 4 is projected to fall about 97% by 2030 — from 0.51 in 2025 to a central estimate of 0.01 (95% range 0.00–0.91). A 5-year backtest shows a typical error of ±77.4%, with 100% of held-out values landing inside the 95% band.19752030
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 →
20260.100.000.99
20270.080.000.97
20280.060.000.95
20290.040.000.93
20300.010.000.91

Routes In BCR 4

Routes recording Greater 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 →
MonahanALASKA121993
SourdoughALASKA102018
Paxson LakeALASKA81993
KalifonskyALASKA72025
Mud RiverALASKA72004
Hather CreekALASKA62004
WillowALASKA42025
ChistochinaALASKA32021
PetersvilleALASKA32023
Seven LakesALASKA32025
Ft. RichrdsnALASKA32023
NebesnaALASKA21975
NorthwayALASKA22018
CantwellALASKA22025
L SalchaALASKA21989
CohoeALASKA22023
ToklatALASKA11999
Skilak LakeALASKA11985
HomerALASKA11978
Hatcher PassALASKA12012
Swan Lake RdALASKA12025
Anchor RiverALASKA12021
Lake LouiseALASKA12025
KachemakALASKA12019
Burma RoadALASKA12025

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