Species · BCR 4 · BBS 2025 Release · 1966–2024
Merlin In BCR 4
Merlin in BCR 4 has edged up: up 23% on the route-weighted index since 1988.
+23%Since 1988
35Routes In Region
36Years
Notable Signals
No notable trend signals for Merlin in BCR 4. See the full index history below.
Forecast
If the recent trend holds, Merlin in BCR 4 is projected to rise about 72% by 2029 — from 0.08 in 2024 to a central estimate of 0.14 (95% range 0.03–0.26). A 5-year backtest shows a typical error of ±58%, with 100% of held-out values landing inside the 95% band.
+72%Change by 2029
0.14Projected 2029 index
0.03–0.2695% range
±58%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.14 | 0.03 | 0.25 |
| 2026 | 0.14 | 0.03 | 0.25 |
| 2027 | 0.14 | 0.03 | 0.25 |
| 2028 | 0.14 | 0.03 | 0.25 |
| 2029 | 0.14 | 0.03 | 0.26 |
Routes In BCR 4
| Toklat | ALASKA | 4 | 2021 |
| Kalifonsky | ALASKA | 4 | 2018 |
| Ft. Richrdsn | ALASKA | 3 | 2008 |
| Tatalina | ALASKA | 3 | 2012 |
| Chistochina | ALASKA | 2 | 2023 |
| Maclaren | ALASKA | 2 | 2001 |
| Cohoe | ALASKA | 2 | 2023 |
| Caribou Mtn. | ALASKA | 2 | 2022 |
| Moose Creek | ALASKA | 2 | 2010 |
| Kuskulana | ALASKA | 2 | 2024 |
| Eagle | ALASKA | 1 | 2023 |
| Chatanika R | ALASKA | 1 | 2021 |
| Birch Lake | ALASKA | 1 | 2007 |
| Livengood | ALASKA | 1 | 2010 |
| Slana | ALASKA | 1 | 2014 |
| Monahan | ALASKA | 1 | 2018 |
| Cantwell | ALASKA | 1 | 2021 |
| L Salcha | ALASKA | 1 | 1988 |
| Chena Hot Sp | ALASKA | 1 | 1990 |
| Kenny Lake | ALASKA | 1 | 2017 |
| Chicken | ALASKA | 1 | 1994 |
| Savage | ALASKA | 1 | 2021 |
| Hatcher Pass | ALASKA | 1 | 2015 |
| Swan Lake Rd | ALASKA | 1 | 2004 |
| Anchor River | ALASKA | 1 | 2018 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.