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I was told by my dam Cousin that the island at the “Y” might be made of dredge material. In looking at the film at around 7 minutes that appears to be the case.
Great video! Thanks for posting it on here Brian! Too bad there wasn’t a little narration to go along with the images.
As for the dam island, I believe it is partially made of dredge material. Over the years I have looked at several old plat maps, survey maps, and pre lock and dam aerial photos and everything indicates that the approach canal to the lock from the downstream end is actually where the mouth of the Vermillion River was located. When building the dam I suspect they rerouted the Vermillion to exit where it does now – which would make sense given it is a ~1/2 mile straight stretch. Very few rivers naturally run straight after all! Plus, when you come down the Vermillion you can visualize where it used to come out – now there is a dike. The island was much smaller than it is now. If I recall, it was just a big sandbar in the air photo I looked at. The wing dam at the mouth of the Vermillion river was likely installed to direct main river flow to the north side of Diamond Island. Pre lock and dam the main channel went to the south of Diamond Island, hence its inclusion in WI and not MN.
Again, thanks for sharing the video. I love reading and look at anything related to river history, especially local information.