I've always called that the Denton Creek arm... the few times I've trekked up there we did ok, lots of t-posts in the water to gouge the bejesus out of your boat when you get way up there. I don't know the lane to get up there so it took me FOREVER at power idle speed to get where I wanted to go.
Used to fish the west arm and caught some nice fish but they were mainly south(on the dam side) of the first bridge. Used to go up there back in the late 90's and there's some awesome looking creek channels, but just didn't get near as many bites north of the bridge.
2018 Chevy Tahoe 2014 Legend Alpha 191 PB Largemouth 9.56 Ray Roberts