UTProf
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Word from USFS is Noli rose over 20 feet in 6 hours, 8 feet above the highest ever recorded, all way back to 1913 when Dam was built
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The train trestle in Gorge has different stages spray painted (swatches) on the bridge. Stage 1-4. Stage 4 is above the train tracks. Ive seen tires above the Sycamores from devastating flooding back in 2010's. This dwarfed that. Think about that, water above the tree line.
Helene measured over 62 ft. high
I think we actually built better on some things when we didn't have it all mathed out. What I mean is if I give you an exact measurement you'll meet it. If I tell you to build this to stop a flood but I don't give you any measurements, you'll go bigger than you think you need just to be safe.