I don't leave anything in my car. I take my registration and proof of insurance with me in a waterproof bag and leave glove box and compartments open. Hopefully they will look in, see there is nothing, and move on to the next car. Probably just fooling myself, but haven't been broken into yet.
Let's be real, the cedar has been public fodder since it opened some years ago. Because of accessibility there are going to be a ton of people out on the river. Low flows just means fewer will drown when they try wading in tennis shoes and cut off shorts.
From being there I didn't find it to be crowded or public fodder until the 3rd or 4th season after opening. Kind of interesting, it fished like a dream and the only crowds to contend with were innertubers. Herds of anglers didn't show simply because a 10 year closure reopened in our backyard. They came much later once the porn was posted. Not surprising I guess.