Southern Lake levels: Update 11, 8-July 2021

Hi All,

This is the 11th email update sharing information about the flood situation for the Southern Lakes and Laberge. New flood info is highlighted in yellow. New flood response info is highlighted in blue.

As of Sunday morning 4-July, Marsh Lake surpassed the 2007 peak flood level. Laberge surpassed the 2007 peak late on Sunday. Bennett surpassed the peak on Monday and Tagish surpassed the 2007 peak on Tuesday. The Southern Lakes and the Yukon River in Whitehorse are now rising between 1 and 1-1/2"/day. As of yesterday, Laberge began to slow its rate of rise as well. I have added a new page which shows the rise per day over the past week as well as a forecast for the weather.

Flood response:

 *   Southern Lakes Flood Incident Management Team is being led by Mike Smith
 *   The Incident Management Team information line is: This email address is being protected from spambots. You need JavaScript enabled to view it. or 867-332-7084
 *   If you or a neighbour you know needs some help, please let me or the flood team know
 *   Sand and sand bags are now available at 8 locations
 *   1. South McClintock Rd at intersection of Army Beach Connector
 *   2. Boat launch at Nolan Dr
 *   3. Marsh Lake Community Centre in Judas Creek
 *   4. CTFN campground in Tagish
 *   5. Tagish cemetery in Taku subdivision
 *   6. CTFN yard by the airstrip in Carcross
 *   7. Jackfish Bay on Laberge
 *   8. Hootalinqua Fire Hall
 *   The flood team is prioritizing primary residences that are most at risk of flooding
 *   They have retained flood specialists from the prairies and Canadian Armed Forces and Ranger to assist with flood defences
 *   We now have 150 personnel to assist residents and volunteers
 *   We are working to extend landfill hours in support of flood defence activities
 *   7-July, EMO issued an evacuation alert to some residents in Army Beach and South McClintock - this is a precaution so residents prepare in case we hit an unexpected significant wind or rain event which overwhelms flood defences
 *   We are launching a campaign for no boat wake by properties

 *   Southern Lakes winter snow load was more than twice our average
 *   19-March 2021, Yukon Energy (YEC) opened the locks at the Lewes River control structure (roughly 2 months early)
 *   YEC reopened the boat lock and removed the gates completely
 *   YEC removed driftwood from in front of the control structure on Tuesday and they are working to raise and/or completely remove the gates
 *   YEC has dropped elevation of Schwatka by -0.93 m to try to increase flow through Miles Canyon
 *   Some roads are now flooded isolating access to some homes
 *   The current projection of lake level rise is 658m, which is an additional 50 cm / 20" of rise
 *   There remains a lot of uncertainty with all projections and we will need to monitor the rise closely
 *   Dr. Benoit Turcotte (research hydrologist) from Yukon University wrote an article explaining the flood (click here<>)
 *   Flood warning for Southern Lakes was updated on 2-July (click here<>)
 *   As of 7-July the boil water advisory was expanded for Southern Lakes, Laberge, Kusawa and Takhini River  (<>click here<>)

The attached graphs show the lake levels of Marsh, Tagish, Laberge and now Bennett over the past 20 years based on Government of Canada hydrometric data. Peak lake levels are typically reached in August. The 2007 flood year is indicated in purple and the average is shown in red. 2021 is shown as the dotted light blue line. I have added the full-supply and low-supply levels in yellow (please note that the Gov Canada hydro data uses relative elevations; I have adjusted the levels by their suggested datum conversions).

If you know of anyone else that would like to receive this update, please let me know. And if you have any questions / information about the flood response, please send them to me or This email address is being protected from spambots. You need JavaScript enabled to view it.



Click here for  pdf 2021 07 08 Southern Lake levels (412 KB)