| JA | FE | MR | AL | MA | JN | JL | AU | SE | OC | NO | DE | Extremes
All times are Pacific Standard Time (PST), to convert to Pacific Daylight Time (PDT), add one hour to the listed time.
| Maximum water levels(metres) | Minimum water levels(metres) | |||||
| Day | Time | Height | Day | Time | Height | |
| January | 13 | 07:52 | 5.3 | 9 | 22:14 | 0.2 |
| February | 10 | 06:37 | 5.1 | 7 | 22:00 | 0.6 |
| March | 9 | 04:49 | 4.8 | 30 | 14:07 | 0.8 |
| April | 27 | 20:35 | 4.8 | 27 | 12:58 | 0.3 |
| May | 27 | 21:13 | 5.0 | 25 | 11:55 | 0.1 |
| June | 25 | 20:39 | 5.1 | 23 | 11:39 | 0.0 |
| July | 23 | 19:22 | 5.1 | 21 | 10:37 | 0.2 |
| August | 21 | 18:33 | 5.0 | 18 | 09:32 | 0.7 |
| September | 17 | 16:41 | 4.8 | 15 | 08:16 | 1.1 |
| October | 14 | 14:43 | 4.7 | 20 | 00:16 | 0.8 |
| November | 5 | 08:07 | 4.9 | 5 | 00:31 | 0.5 |
| December | 5 | 08:42 | 5.2 | 2 | 23:31 | 0.2 |
