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

Franklin's Gull In Great Basin

All regionsGreat BasinWetland birds

Franklin's Gull in Great Basin has surged: up 153% on the route-weighted index since 1972.

+153%Since 1972
39Routes In Region
52Years

Notable Signals

long arc increasecomputed index

Franklin's Gull has surged in Great Basin: up 153% on the route-weighted index since 1972.

Forecast

If the recent trend holds, Franklin's Gull in Great Basin is projected to rise about 31% by 2029 — from 5.7 in 2024 to a central estimate of 7.4 (95% range 0.24–15). A 5-year backtest shows a typical error of ±20%, with 100% of held-out values landing inside the 95% band.

+31%Change by 2029
7.4Projected 2029 index
0.24–1595% range
±20%Backtest error
19692029
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
20257.00.0014
20267.10.0014
20277.20.0814
20287.30.1614
20297.40.2415

Routes In Great Basin

Routes recording Franklin's Gull in Great Basin.
PromontoryUTAH7412024
PrestonIDAHO3782023
Bear RiverUTAH3042023
HenryIDAHO1161981
Blacks CreekIDAHO942015
Harney LakeOREGON752022
Cedar HillIDAHO612015
Tractor FlatIDAHO442024
DeltaUTAH432004
RirieIDAHO402019
Malheur NwrOREGON322022
Johnson CanUTAH301992
Modoc PointOREGON132009
PrincetonOREGON131985
Mud LakeIDAHO112023
LakeviewOREGON112022
BakerIDAHO71984
PocatelloIDAHO62015
Fish LakeOREGON62022
Warner VallyOREGON52023
Pasadena ValIDAHO41993
Catlow RimOREGON32024
ChinchaloOREGON32016
SpringfieldIDAHO22018
Daniels ResIDAHO22017

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