I work for the county and live waaaaay to the north, like 215 north wiith 3 kids, so it would be easier for me to ask someone in the countys parks dept. than actually make it down there.
As a up date, I cut one stick to work for an arrow and picked up a few dry. I threw away the dry as they were too difficult to work. The wet was, obviously a lot easier, but it has so many small knots that it makes it hard to keep round. I also worked about 3 tamrisks today aged a few weeks. Debarking was a little more difficult but they look and feel like they will make much better arrows. Desert willow will work, but Im sure now tamarisk will be better.
I know there is a threat here or over at paleo about working a desert willow into a bow that indicated the wood was only so so, but I still would like to give it a shot. But it if it is in the part, I am sure they would frown on cutting it. I would bet they would let cutting of tamarisk though.