BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Swainson's Hawk In Great Basin

All regionsGreat BasinGeneralists

Swainson's Hawk in Great Basin has surged: up 369% on the route-weighted index since 1970.

+369%Since 1970
173Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Swainson's Hawk has surged in Great Basin: up 369% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Swainson's Hawk in Great Basin is projected to rise about 46% by 2029 — from 1.0 in 2024 to a central estimate of 1.5 (95% range 1.0–1.9). A 5-year backtest shows a typical error of ±24.7%, with 40% of held-out values landing inside the 95% band.

+46%Change by 2029
1.5Projected 2029 index
1.0–1.995% range
±24.7%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
20251.40.941.8
20261.40.961.8
20271.40.981.9
20281.41.01.9
20291.51.01.9

Routes In Great Basin

Routes recording Swainson's Hawk in Great Basin.
AcequiaIDAHO292012
PicaboIDAHO212021
PocatelloIDAHO202019
Mud LakeIDAHO142023
SnowvilleUTAH132024
BatesIDAHO122023
Cedar HillIDAHO122024
DuboisIDAHO102024
Twin ButtesIDAHO92024
UmatillaOREGON82023
KeystoneWASHINGTON82024
RirieIDAHO62023
Columbia NwrWASHINGTON62022
CedarvilleCALIFORNIA52024
SquirrelIDAHO52024
Blacks CreekIDAHO52017
MerrillOREGON52022
SheavilleOREGON52022
Trout CreekOREGON52021
HattonWASHINGTON51994
SulphurWASHINGTON52022
LikelyCALIFORNIA42024
PrestonIDAHO42023
Majors PlaceNEVADA42024
Ruby Valley 2NEVADA42017

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