| Date: | 1959-06-29 |
| Time: | 0000 A |
| Geyser: | Fan and Mortar |
| Webcam: | No |
| Initial: | No |
| Major/Minor: | N/A |
| Duration: | |
| Time Entered: | 2022-06-24 21:40:34 |
| Time Uploaded: | 2022-06-24 21:40:34 |
| Entrant: | mhreed |
| Observer: | Marler (1959) annual report |
| Submitted to: | Geysertimes.org |
| Comments: | No time available. This and the eruption on 21 June are the only ones listed in Marler's report. After the August Hebgen Lake earthquake, temperatures increased in both features and "increased boiling in Fan was very noticeable for the first few weeks." |