Species · BCR 16 · BBS 2025 Release · 1966–2024
Grasshopper Sparrow In Southern Rockies / Colorado Plateau
Grasshopper Sparrow in Southern Rockies / Colorado Plateau has collapsed: down 99% on the route-weighted index since 1973.
-99%Since 1973
25Routes In Region
33Years
Notable Signals
long arc declinecomputed index
Grasshopper Sparrow has collapsed in Southern Rockies / Colorado Plateau: down 99% on the route-weighted index since 1973.
Forecast
If the recent trend holds, Grasshopper Sparrow in Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±2226.8%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.00Projected 2029 index
0.00–1.395% range
±2226.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 1.3 |
| 2026 | 0.00 | 0.00 | 1.3 |
| 2027 | 0.00 | 0.00 | 1.3 |
| 2028 | 0.00 | 0.00 | 1.3 |
| 2029 | 0.00 | 0.00 | 1.3 |
Routes In Southern Rockies / Colorado Plateau
| Altonah | UTAH | 52 | 1993 |
| Pastura | NEW-MEXICO | 6 | 2015 |
| Moffat | COLORADO | 4 | 2016 |
| Gardner | COLORADO | 4 | 2002 |
| Buford | COLORADO | 3 | 2023 |
| Steamboat L. | COLORADO | 3 | 2013 |
| Capulin | NEW-MEXICO | 3 | 1994 |
| Brookhurst | WYOMING | 3 | 2022 |
| Round Rock | ARIZONA | 2 | 1971 |
| Gallinas | NEW-MEXICO | 2 | 1993 |
| Kamas | UTAH | 2 | 1998 |
| Vernal | UTAH | 2 | 2018 |
| Yampa | COLORADO | 1 | 2015 |
| Delta | COLORADO | 1 | 1980 |
| Parlin | COLORADO | 1 | 2010 |
| Wilson Creek | COLORADO | 1 | 2014 |
| Uncompahgre | COLORADO | 1 | 2003 |
| San Luis | COLORADO | 1 | 1993 |
| Jensen | UTAH | 1 | 2022 |
| Heber Mtn. | UTAH | 1 | 2012 |
| Alton | UTAH | 1 | 1997 |
| Buford | WYOMING | 1 | 2009 |
| Warbonnet | WYOMING | 1 | 1990 |
| Fletcher Pk | WYOMING | 1 | 2024 |
| Sybille Cyn | WYOMING | 1 | 2015 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.