BirdAnalyst
Species · South Dakota · BBS 2025 Release · 1966–2024

Wilson's Phalarope Population Trend in South Dakota

All statesShorebirds

Wilson's Phalarope in South Dakota has fallen sharply: down 61% on the route-weighted index since 1969.

-61%Since 1969
46Routes In State
57Years

Notable Wilson's Phalarope Trends in South Dakota

long arc declinecomputed index

Wilson's Phalarope has fallen sharply in South Dakota: down 61% on the route-weighted index since 1969.

Wilson's Phalarope Population Forecast in South Dakota

If the recent trend holds, Wilson's Phalarope in South Dakota is projected to rise about 18% by 2029 — from 0.36 in 2024 to a central estimate of 0.43 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±64.1%, with 80% of held-out values landing inside the 95% band.

+18%Change by 2029
0.43Projected 2029 index
0.00–1.395% range
±64.1%Backtest error
19672029
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
20250.460.001.3
20260.450.001.3
20270.450.001.3
20280.440.001.3
20290.430.001.3

Wilson's Phalarope Survey Routes in South Dakota

Routes recording Wilson's Phalarope in South Dakota.
White Lake3020111967
Maurine1020191969
Chamberlain820111968
Howard620122012
Lacreek620191991
Roswell520061969
Ft Thompson519681968
Reva520241987
Rosebud419681968
Pioneer420021993
Gorman420101995
Railroad Butte419981998
Conde319841967
Long Lake320171967
Promise319731973
Ottumwa319981967
Marcus320102001
Tripp220171986
Raymond220111967
Broadland220132001
Veblen220231972
Britton220231971
Harding220141968
Ardmore220191977
French Creek220032000

Wilson's Phalarope Population Trend in Other States

californiacoloradoidahoillinoisiowakansasminnesotamontananebraskanevadanew-mexiconorth-dakotaoklahomaoregontexasutahwashingtonwisconsinwyoming

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