Water Levels

Before criticizing the management of the water level, let’s not forget … that it is thanks to this reservoir of Hydro-Québec that we can enjoy our sites on the water’s edge. Without this reservoir we would all be in a field or just near a stream. We must accept that the reservoir’s level fluctuates regularly depending on the circumstances.

For questions or additional information contact us: HERE

Water Level:

  • To see current water level on lake Poisson Blanc: click here
  • Forecast of future water level for 2 days: click here
  • To find specific points of water level in Québec waterways on the map: click here

Here is a study concerning water level policies for dams: Huaringa_Alvarez_Uriel_Francisco_MScA_2014

What are the legal & environmental concerns about water levels on a reservoir like our lake: click here

Don’t forget! Our lake is a reservoir and is part of the Ottawa river watershed which is govern by Ontario Hydro & Hydro-Québec

Here is a link to get current information about our regional watershed.

Click: http://ottawariver.ca/forecast.php

EVOLUGEN Power and the other dam managers operating in the Lièvre River watershed have a primary objective of preventing flooding on the Lièvre River as well as on the Thousand Islands River. In flood and drought periods, the goal is to manage water in a way that minimizes damage to all involved stakeholders, including riparian owners.

In the watershed of the Lièvre River, 16 riparian municipalities, their citizens and the relevant departments and agencies are now better prepared to act in the event of a disaster. Supported by Dam Managers and Regional Emergency Organization, municipalities and departments completed an emergency response planning process and shared the results of their work with the public in the fall of 2010. Although this joint plan may be useful for any type of disaster, the scenario used for the approach was that of an exceptional flood or dam failure. For more details, consult your local municipality.

If you have any comments or questions, do not hesitate to email them:  infolalievre@brookfieldrenewable.com

or leave a message at 819-986-4628 / toll free: 1-877-986-4364.

Normal water level 201,03 meters (from June to August)

Maximum water level: 201,09 meters (usually in April and May)

Flooding: over 202 meters

Why our Water Levels keep Fluctuating:

What is a Watershed?

The big picture is that we are part of the Ottawa River Watershed, do you know what it means?

**Word of the day: WATERSHED AKA drainage basin, catch basin, hydrographic basin, etc. **

Definition: A watershed is defined as an area of land where all the surface water drains into the same place, whether it’s a creek, a stream, a river or an ocean. Therefore, all precipitation, such as rain or snow, that falls on a watershed ends up flowing to the same place.

Source: http://www.canadiangeographic.com/watersheds/map/…

We’re part of the La Lièvre watershed

Our watershed

We are trying our best to keep you inform threw our Facebook page!

Some of you don’t understand why our water keeps fluctuating?

Here is a video clip explaining why? https://www.facebook.com/hydroquebec1944/videos/2252068134856789/

About the Poisson Blanc Reservoir:

Our reservoir effects many municipalities along La lièvre to Gatineau then combines with other reservoirs of the Ottawa river watershed. There are three authorities governing the dams so there must be coordination between all of them.

Sadly, for us, what is considered the most important for them is the safety & security of those living in the urban areas: Gatineau, Ottawa and Montréal. For us, there is a understanding that the water level should be stable till Labour Day afterwards the water level could go down rapidly for many reasons including maintenance of the different dams.

History of Legal Procedures to Regulate the Water Level & Other Communications:

Legally, another association (which no longer exist) tried to regulate the level of our reservoir by legal means. The reason of the legal procedures was for the shoreline erosion but not really to prolong the period when the water level is stable till the end of September. So, presently for us, If we want to guarantee a certain level we must reach all owners affected including those living up north of the Poisson Blanc. For this to happen we must prepare our case which is a long process.

Sources are from the archives of the «Association les amis de la lièvre» (this association is no longer active) and  also COBALI.

The official act of 1992 defining our water level:

To download: Download

Legal procedure to stop the erosion of the reservoir presented by :


To download: Download

In 2006 a plan was approved for the management of the water level:

To download: Download

Last official document from the Association «Les amis de la Lièvre» which include information about the legal procedures and also history of our reservoir:

To download: Download

General snapshot of our watershed in 2013:

To download: Download

Official communication in 2015 by our Association had concerning the water level.

The letter was send by Ronald Thomas (Representative for Newton Bay)

To download: Download


Since 2020, the Association is receiving weekly forecasts for the months of September and October.

This is the result of many months of discussion done, in 2019, by our committee concerning this issue (members: Jeff, Larry, Margaret and JoAnn).

To download: Download