| Date: | 1986-08-15 |
| Time: | 1725 |
| Geyser: | Steamvalve Spring |
| Webcam: | No |
| Initial: | No |
| Major/Minor: | N/A |
| Duration: | 8m |
| Standardized Duration: | 8m |
| Time Entered: | 2017-08-02 09:30:19 |
| Time Uploaded: | 2019-05-13 21:38:00 |
| Entrant: | research-mab |
| Observer: | 1986 log |
| Submitted to: | |
| Comments: | 8/15/1986 17:25 Steamvalve “Geyser” erupted for 8 minutes and reached 10-12 ft. hts with a very large (for Steamvalve) overflow. After eruption it drained almost entirely. |