| Date: | 2015-12-10 |
| Time: | 1223 |
| Geyser: | Old Faithful |
| Webcam: | Yes |
| Initial: | No |
| Long/Short: | Long |
| Duration: | ~3.75m |
| Standardized Duration: | ~3.75m |
| Time Entered: | 2015-12-10 12:23:31 |
| Time Updated: | 2015-12-10 14:28:20 |
| Time Uploaded: | 2019-05-13 21:45:03 |
| Entrant: | JSJ |
| Observer: | James St. John |
| Submitted to: | Geysertimes.org |
| Comments: | Preplay low spouting/splashing at 1217 and 1222. Eruption start at ~earliest 1223. Done between 1226 + 44s and 1226 + 50s. |