| Observation | Date | Location | Number of Birds | Data Source |
|---|---|---|---|---|
| Data | 2005-06-03 | Delevan T43 | 40000 | Statewide Survey, June 2005 (unpublished) |
| Data | 2000-04-25 | Road 99W at Road 39 | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-25 | Road 48 | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-25 | Road PP at Road 45 | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-25 | Road VV at Road 34 | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-25 | Road VV at Road 45 | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-24 | Delevan Blind 24 | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-24 | Sacramento NWR-Pool 11.3 | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-24 | Sacramento NWR-Norman Road | 0 | Statewide Survey, 2000 (unpublished) |