| Date: | 2015-12-20 |
| Time: | 1358 |
| Geyser: | Old Faithful |
| Webcam: | Yes |
| Initial: | No |
| Long/Short: | Long |
| Duration: | ~3.75m |
| Standardized Duration: | ~3.75m |
| Time Entered: | 2015-12-20 13:59:08 |
| Time Updated: | 2015-12-20 16:03:25 |
| Time Uploaded: | 2019-05-13 21:37:59 |
| Entrant: | JSJ |
| Observer: | James St. John |
| Submitted to: | Geysertimes.org |
| Comments: | Eruption start at late 1358. Done at 1402. |