The river has been low and clear nearly all Spring and Summer, so yea, the river grass has grown thicker than normal. It has on French Creek as well. Actually, it's thicker, and has grown in more places, than I have ever seen. Numerous things start the grass breaking loose, but the main thing is a drop in water temperature this time of year causing die off to begin, and dead grass to break loose.
It's worse after a rain, one that actually raises the water level, because the floating grass will gather in slow pockets and eddies when water level is low. The rising water causes it to move out and wash down.
We actually need a deluge to wash the river out and I was hoping for the remnants of Hurrican Isaac to wash us out, but sadly it looks as if that probably won't happen.
If you think the grass makes fishing miserable, try running a jet drive outboard in it! You have to stop and clean the jet out constantly!