Species · BCR 5 · BBS 2025 Release · 1966–2024
American Tree Sparrow In Northern Pacific Rainforest
American Tree Sparrow in Northern Pacific Rainforest has collapsed: down 92% on the route-weighted index since 1985.
-92%Since 1985
6Routes In Region
28Years
Notable Signals
long arc declinecomputed index
American Tree Sparrow has collapsed in Northern Pacific Rainforest: down 92% on the route-weighted index since 1985.
Forecast
If the recent trend holds, American Tree Sparrow in Northern Pacific Rainforest is projected to stay roughly flat through 2028, near 0.03 (95% range 0.00–0.30). A 5-year backtest shows a typical error of ±263.4%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2028
0.03Projected 2028 index
0.00–0.3095% range
±263.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.04 | 0.00 | 0.32 |
| 2025 | 0.04 | 0.00 | 0.31 |
| 2026 | 0.04 | 0.00 | 0.31 |
| 2027 | 0.03 | 0.00 | 0.31 |
| 2028 | 0.03 | 0.00 | 0.30 |
Routes In Northern Pacific Rainforest
| Moose Pass | ALASKA | 6 | 1992 |
| Sheep Mtn | ALASKA | 2 | 2017 |
| Thorne Bay 2 | ALASKA | 2 | 2016 |
| Skagway | ALASKA | 2 | 2023 |
| Seward | ALASKA | 1 | 1992 |
| Thompson Pas | ALASKA | 1 | 2008 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.