Dam #3 above Harpers to 340 bridge …
… is considered a class lll WW section . It’s also considered hazardous . Don’t get those two confused as if they mean the same thing exacly .
The bottom of that section has many very deep rock ridges and canyons with crazy under water currents much differnt than what you see on top … some of them are 25’-30’ and maybe deeper down under .
I’ve heard of large suck holes that tunnel below the river bed , seriuos undercuts , and frankly because of the 20 or more times I’ve been up there all day fishing and just hanging out in general , the place intimidates me a little bit when I think about running a canoe on it … hence , I’ve not run it and have no intention to do so … I suppose as long as you stay on top the water and can keep breathing you win . I know someone personally who got taken for a loooong swim down through that section and he got beat to hell , but he’s still breathing today .
Here’s the same links I posted in reply to your other post about safe gage levels and camp for Potomac .
ps., … Harpers Ferry USGS gage hasn’t been operational for some years now .