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

Olive-sided Flycatcher In Sierra Nevada

All regionsSierra NevadaAerial insectivores

Olive-sided Flycatcher in Sierra Nevada has collapsed: down 80% on the route-weighted index since 1970.

-80%Since 1970
38Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Olive-sided Flycatcher has collapsed in Sierra Nevada: down 80% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Olive-sided Flycatcher in Sierra Nevada is projected to fall about 100% by 2029 — from 4.8 in 2024 to a central estimate of 0.00 (95% range 0.00–6.2). A 5-year backtest shows a typical error of ±86.1%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–6.295% range
±86.1%Backtest error
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 index95% low95% high
20250.820.007.0
20260.570.006.8
20270.320.006.5
20280.080.006.3
20290.000.006.2

Routes In Sierra Nevada

Routes recording Olive-sided Flycatcher in Sierra Nevada.
Cottage SpgsCALIFORNIA251975
GeneseeCALIFORNIA232024
Lassen ParkCALIFORNIA201989
Eagle LakeCALIFORNIA172024
Hat CreekCALIFORNIA142018
Tahoe NfCALIFORNIA121994
Last ChanceCALIFORNIA122019
WestvilleCALIFORNIA92024
JohnsvilleCALIFORNIA92024
Pollock PinesCALIFORNIA72024
Pine MountainCALIFORNIA72017
Tuolumne GroveCALIFORNIA62024
RivertonCALIFORNIA62023
LumberyardCALIFORNIA52024
ChilcootCALIFORNIA52024
DardanelleCALIFORNIA42019
Little TruckeeCALIFORNIA42023
Greenhorn MtCALIFORNIA32008
Higgins CornCALIFORNIA32023
LakeshoreCALIFORNIA32024
Chaos CraterCALIFORNIA32019
ChesterCALIFORNIA32017
GoumazCALIFORNIA32011
Forest Hill 2CALIFORNIA32005
DownievilleCALIFORNIA22024

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