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Message: <blockquote data-quote="Allen" data-source="post: 145418" data-attributes="member: 389">Think about it, how could you possibly have an ice jam on the farthest downstream part of a reservoir like Sakakawea that is over 150 ft deep?  And no, there is no ice jam blocking the inlet to the dam's outlet either, they are a long ways below the water surface.Lycan, same kind of response for you.  Think about it critically when people say things like that.  One can just nod and smile, but please don't take them serious.  And no, there was no "ice jam" south of Bismarck a couple weeks ago.  It was nothing more than the normal icing over of the river. Sheets of ice form on the flowing river, collect in the meanders south of Bismarck, and eventually this collection of ice cubes forms all the way up through the Bismarck/Mandan area.  It's not a "jam" where the water can't get around/under it.  Instead, this is where a lot of the ice sheets get turned sideways (not horizontal) and create a tremendous amount of friction under the ice surface.  It also obstructs part of what was once a clear cross-section of the river that had water moving through it, so in order for the river to convey the same amount of water it did before the ice collected, the river level has to rise in order to get more channel capacity to make up for that which is now immovable ice.  Very different than an ice jam which often obstructs flow in the river all the way to the river bed and creates flooding as water backs up.  I am guessing the ice on either the Yellowstone or Missouri above Williston has shifted and is creating some concerns?And lastly, not much water in the Missouri River comes out of Canada.  There's the Milk which has a part of its drainage north of the border, but everything from Fortuna and east goes into either the Souris or Red River basins, both of which flow INTO Hudson's Bay drainage basin.Gotta love the internet at times.</blockquote>

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