Species · Oregon · BBS 2025 Release · 1966–2024
Glaucous-winged Gull Population Trend in Oregon
Glaucous-winged Gull in Oregon has edged down: down 17% on the route-weighted index since 1973.
-17%Since 1973
5Routes In State
26Years
Notable Glaucous-winged Gull Trends in Oregon
No notable trend signals for Glaucous-winged Gull in Oregon. See the full index history below.
Glaucous-winged Gull Population Forecast in Oregon
If the recent trend holds, Glaucous-winged Gull in Oregon is projected to fall about 66% by 2020 — from 0.11 in 2015 to a central estimate of 0.04 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±111.1%, with 40% of held-out values landing inside the 95% band.
-66%Change by 2020
0.04Projected 2020 index
0.00–0.1295% range
±111.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2016 | 0.04 | 0.00 | 0.12 |
| 2017 | 0.04 | 0.00 | 0.12 |
| 2018 | 0.04 | 0.00 | 0.12 |
| 2019 | 0.04 | 0.00 | 0.12 |
| 2020 | 0.04 | 0.00 | 0.12 |
Glaucous-winged Gull Survey Routes in Oregon
| Glasgow | 7 | 2015 | 1987 |
| Tualatin | 1 | 1997 | 1968 |
| Nicolai Mtn. | 1 | 2001 | 1993 |
| Wedderburn | 1 | 2000 | 1972 |
| Hazel Camp | 1 | 2011 | 1975 |
Glaucous-winged Gull Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.