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Portland: water level history
Record1912–2025114 years
Sea level trend1.98 mm/yrNo. 62 of 88
Great diurnal range3.02 mNo. 16
Highest water level4.44 m2024-01-13
Annual mean water level vs. period average (cm)
Bars are relative to the lowest year on record.
Top 10 monthly highest water levels
| Month | Highest (m above MSL) |
|---|---|
| January 2024 | 2.931 |
| February 1978 | 2.800 |
| January 1978 | 2.742 |
| December 2022 | 2.637 |
| January 2018 | 2.613 |
| March 2024 | 2.553 |
| March 1976 | 2.538 |
| December 1990 | 2.535 |
| November 1944 | 2.532 |
| November 1945 | 2.532 |
- 2025
- 2024
- 2023
- 2022
- 2021
- 2020
- 2019
- 2018
- 2017
- 2016
- 2015
- 2014
- 2013
- 2012
- 2011
- 2010
- 2009
- 2008
- 2007
- 2006
- 2005
- 2004
- 2003
- 2002
- 2001
- 2000
- 1999
- 1998
- 1997
- 1996
- 1995
- 1994
- 1993
- 1992
- 1991
- 1990
Times and heights are NOAA astronomical predictions and do not include weather effects. Times are station local time (incl. daylight saving), heights in metres above MLLW. Not for navigation.
About this page
Monthly mean water levels at Portland since 1912. Long-term sea level trend: 1.98 mm per year.