Species · BCR 10 · BBS 2025 Release · 1966–2024
Black-crowned Night Heron In Northern Rockies
Black-crowned Night Heron in Northern Rockies has fallen sharply: down 58% on the route-weighted index since 1979.
-58%Since 1979
18Routes In Region
31Years
Notable Signals
long arc declinecomputed index
Black-crowned Night Heron has fallen sharply in Northern Rockies: down 58% on the route-weighted index since 1979.
Forecast
If the recent trend holds, Black-crowned Night Heron in Northern Rockies is projected to stay roughly flat through 2024, near 0.01 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±88.4%, with 80% of held-out values landing inside the 95% band.
n/aChange by 2024
0.01Projected 2024 index
0.00–0.1095% range
±88.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2020 | 0.02 | 0.00 | 0.11 |
| 2021 | 0.02 | 0.00 | 0.11 |
| 2022 | 0.01 | 0.00 | 0.10 |
| 2023 | 0.01 | 0.00 | 0.10 |
| 2024 | 0.01 | 0.00 | 0.10 |
Routes In Northern Rockies
| Neponset Res | UTAH | 12 | 2018 |
| Harmony | WYOMING | 6 | 1988 |
| Saleratus Cr | UTAH | 2 | 2012 |
| Crane Creek | IDAHO | 1 | 2006 |
| Beaverhead | MONTANA | 1 | 1992 |
| Red Rock | MONTANA | 1 | 2015 |
| Sparta | OREGON | 1 | 1992 |
| Randolph | UTAH | 1 | 2019 |
| Woodruff | UTAH | 1 | 2016 |
| Fontenelle | WYOMING | 1 | 2007 |
| Elk Horn | WYOMING | 1 | 2000 |
| Riverside | WYOMING | 1 | 1989 |
| Hunter Peak | WYOMING | 1 | 2003 |
| Mtn View | WYOMING | 1 | 1989 |
| Green River | WYOMING | 1 | 1982 |
| Rawlins | WYOMING | 1 | 1992 |
| Rock River | WYOMING | 1 | 1996 |
| Yellowstone | WYOMING | 1 | 1989 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.