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Message: <blockquote data-quote="Allen" data-source="post: 479335" data-attributes="member: 389">That's all fine and dandy for now that the headwaters area is around 100% of normal, but you have to put that into a little context.  We are not quite halfway through the winter and we usually expect the snowpack to be about 35-40% of the total it will receive during the snow accumulation season.  So, basically...the headwaters have only 35-40% of what is should have come roughly April (when the snowpack peaks).As far as Garrison Dam work, I am not aware of any need to lower Lake Sakakawea to accommodate the upcoming work.  Essentially, updated Probable Maximum Flood (PMF) studies have suggested the dam needs to be able to pass almost 1.2 million cubic feet per second to avoid losing the dam.  The dam is currently able to pass a little under 900,000 cfs.  The actual spillway modification doesn't start this summer, I want to say it's 2028, or later and will take a few years to complete.  The plan is to expand the emergency spillway to accommodate the expected PMF and will be quite the undertaking.If there's other maintenance that will require lower water levels, I am not in the loop on that.For reference, the maximum flow out of Garrison Dam in 2011 was around 152,000 cfs.  A PMF on the Missouri would be nothing short of hell for the Missouri River corridor through ND. Lastly, since 1929, there have been seven floods on the Missouri River bigger than the 2011 event as measured at Bismarck, all before the construction of Garrison Dam.[ATTACH=full]82470[/ATTACH]Here's the full peak streamflow data for Bismarck.https://nwis.waterdata.usgs.gov/nwis/peak?site_no=06342500&agency_cd=USGS&format=html</blockquote>

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