| Date: | 2008-04-29 |
| Time: | 1502 |
| Geyser: | Giant |
| Webcam: | No |
| Initial: | No |
| Major/Minor: | N/A |
| Duration: | 87 minutes |
| Standardized Duration: | 1h 27m |
| Time Entered: | 2013-01-14 22:55:36 |
| Time Updated: | 2013-01-14 22:59:33 |
| Time Uploaded: | 2019-05-13 21:47:40 |
| Entrant: | Tara |
| Observer: | Stephen Eide |
| Submitted to: | |
| Comments: | Mastiff erupted prior to Giant. Eruption occurred during Grotto marathon. Last eruption of the 2005-2008 active phase. |