| Date: | 2021-09-29 |
| Time: | 1557 |
| Geyser: | Grotto Fountain |
| Webcam: | No |
| Initial: | No |
| Major/Minor: | N/A |
| Duration: | 8m |
| Standardized Duration: | 8m |
| Time Entered: | 2021-09-29 15:58:07 |
| Time Updated: | 2021-09-29 16:08:56 |
| Time Uploaded: | 2021-09-29 16:08:56 |
| Entrant: | Graham |
| Observer: | |
| Submitted to: | GeyserTimes for Android |
| Comments: | Erupted on first boil after the SGF series. Boiled before the series but didn't boil during the series for at least 2.5h. |