Tides and water levels data archive

Archived information on tides and water levels.

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Tide and water level station data

Historical, downloadable tide and water level data for 968 gauges across Canada.

Benchmarks for vertical water levels control

Definition of water level gauge benchmarks.

Great Lakes monthly mean water level

Monthly mean water level in metres referred to chart datum.


Historical Great Lakes water level data

Historical monthly mean water levels for each of the Great Lakes from 1918 to 2023.


Tidal field and format descriptions

Tides and current format (TCF) header definition

The TCF is a format used to exchange tidal predictions, water levels, currents and tidal constituents data.

Tidal highs and lows

Sample record of tidal highs and lows data.

Daily means, monthly means and extremes for tides

Sample record of tidal daily mean levels, monthly mean levels and extremes data.


What we are doing


CHS Digital Transformation Initiative

CHS Digital Transformation Initiative

At the Canadian Hydrographic Service, innovation is a guiding principle for the bold digital transformation initiative now underway.

NONNA Version 3.0 Release

NONNA Version 3.0 Release

Client suggested enhancements have been implemented to the CHS NONNA Data Portal including migration to chart datum and enhanced tools for selecting and downloading large geographic areas.

2024 Tide Tables Available Now

2024 Tide Tables Available Now

Download your 2024 Canadian Tide and Current Tables now to help navigate safely through Canadian waters.