| Observation | Date | Location | Number of Birds | Data Source |
|---|---|---|---|---|
| Data | 1999-05-13 | Arena Plains Unit, Merced NWR - Bear Creek | 500 | Personal Observation |
| Data | 1999-04-26 | Bose Road | 500 | Statewide Survey, 1999 (unpublished) |
| Data | 1999-04-26 | San Luis Island | 40 | Statewide Survey, 1999 (unpublished) |
| Data | 1999-04-26 | Kesterson NWR- Freitas Units | 0 | Statewide Survey, 1999 (unpublished) |
| Data | 1999-04-26 | Northrup Road | 0 | Statewide Survey, 1999 (unpublished) |
| Data | 1999-04-26 | San Joaquin River at Highway 165 | 0 | Statewide Survey, 1999 (unpublished) |
| Data | 1999-04-26 | Nelander Road | 40 | Personal Observation |
| Data | 1999-04-24 | Arena Plains Unit, Merced NWR - Bear Creek | 0 | Statewide Survey, 1999 (unpublished) |
| Data | 1994-04-22 | Arena Plains Unit, Merced NWR - Bear Creek | 15000 | Statewide Survey, 1994 (unpublished) |
| Data | 1994-04-13 | Duck Slough #2 | 500 | Personal Observation |