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southern MN | Mankato, 12 miles downstream, had terrible flooding in the 60s. They built a pretty expensive levee in the 70s. It has been tested in the past decade to about 30 feet. Which it probably will get to now.
They are comfortable holding back a flood of 32 feet. They should be fine within that unless something else happens here. There was a thunderstorm just went over them again.
There are provisions with a wall on top of the levee to handle 39 feet of river, but there is some head scratching if that will all work as planned. It looks good on paper, but I’d not want to be on the back side of that thin wall on that tall levee with that much water pressure on it. At the least they need to shore up a lot of bits here and there if the river ever got that high.
More and more roads are closing in southern Minnesota, under water, as the rain water moves into the streams and rivers. State roads, 4 lanes, big roads. This isn’t so much the dam, it is the widespread rain we got for several weeks.
Paul
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Rapidan Dam Breached
