• The Mean Water Level datum at Britannia1 is 57.9 m.
  • The BYC gates cannot be removed until the water level drops to roughly 59.0 m.
  • During the 2017 flood, the water level reached a peak of 60.44 m.
  • During the 2019 flood, the water level reached a peak of 60.70 m on the evening of 2019-04-30. That’s 2.8 m, or 9′ 2″, above datum. The second peak was at 60.61 m in the early morning of 2019-05-14.
  • At a water level of 60.15 m, the water will be at the top of the south crane well; at 60.20 m, it will be at the top of the north crane well. The service docks cannot be attached if the water level is above approximately 59.7 m.

1 The Britannia water level and flow metering station 02KF005 is actually located at NSC!

Page updated: 2023-08-02.

Update log
12 Jan: HM: Created this update log. Updated link for
13 Jan: HM: Deleted duplicate link.
02 May: HM: Added notes about 2017 and 2019 floods.
08 Jun: HM: Added notes about water levels and crane well walls, and connecting service docks.
09 Apr: HM: Renamed second bullet from “Water Levels and Flows — Ottawa River level Forecasts” to “Lake Deschenes at Britannia – A graphical depiction of current & forecast water levels, along with median and historical high and low levels.” Updated links to second and third bullets.
20 Oct: HM: Re-ordered links. Added link to (past 48 hours). Updated link “” to “ Other editorial updates.


2021-06-11, HM: Updated publish date (was 2013-04-15) and added note below.
2021-11-29, HM: Added note about Britannia station located at NSC.

2022-05-01, HM: Added link to 3-day predictive water levels. Other editorial changes; notably standardizing on “Lac Dechenes” vs “Ottawa River”.
2022-08-16: DS: converted Water Level Monitoring link from post to page.

NOTE: Update the publish date and time when updating page.

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