BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

American Dipper In Sierra Nevada

All regionsSierra NevadaGeneralists

American Dipper in Sierra Nevada has fallen sharply: down 58% on the route-weighted index since 1974.

-58%Since 1974
18Routes In Region
51Years

Notable Signals

long arc declinecomputed index

American Dipper has fallen sharply in Sierra Nevada: down 58% on the route-weighted index since 1974.

Forecast

If the recent trend holds, American Dipper in Sierra Nevada is projected to fall about 77% by 2029 — from 0.32 in 2024 to a central estimate of 0.07 (95% range 0.00–0.32). A 5-year backtest shows a typical error of ±54.6%, with 80% of held-out values landing inside the 95% band.

-77%Change by 2029
0.07Projected 2029 index
0.00–0.3295% range
±54.6%Backtest error
19722029
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
20250.100.000.34
20260.090.000.34
20270.090.000.33
20280.080.000.32
20290.070.000.32

Routes In Sierra Nevada

Routes recording American Dipper in Sierra Nevada.
Bass LakeCALIFORNIA21974
WoodfordsCALIFORNIA22024
Kings CanyonCALIFORNIA22024
Butte MeadowCALIFORNIA22000
Meadow ValleyCALIFORNIA22024
DardanelleCALIFORNIA12018
JohnsvilleCALIFORNIA12019
LumberyardCALIFORNIA12007
Tuolumne GroveCALIFORNIA12018
GeneseeCALIFORNIA12023
DownievilleCALIFORNIA12017
RivertonCALIFORNIA12012
Hat CreekCALIFORNIA12016
LakeshoreCALIFORNIA11997
Chaos CraterCALIFORNIA12001
PaxtonCALIFORNIA12022
WawonaCALIFORNIA11998
ChilcootCALIFORNIA12009

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