| Date: | 1955-08-20 |
| Time: | 1200 A |
| Geyser: | Union |
| Webcam: | No |
| Initial: | No |
| Major/Minor: | N/A |
| Duration: | |
| Time Entered: | 2024-03-17 01:28:55 |
| Time Uploaded: | 2024-03-17 01:28:55 |
| Entrant: | mhreed |
| Observer: | Beal |
| Submitted to: | Geysertimes.org |
| Comments: | Photos of a Union eruption labeled with this date on page 177–178 of black album 3a from the Yellowstone archives. Available here: http://purl.clemson.edu/FF99996CB7D0DE767BF649099FD0F731 |