We had a lovely weekend on Odell Lake.  Fully booked campground on the weekend of 4th of July.  Reserve early.  Well maintained.  We stayed in site 23.  We didn't have lake access, but an easy walk down to the boat dock, or the trail that runs along creeks and to the lake.  There is beach area for swimming just off the trail.  This is a powerboat friendly lake.  It got a bit chilly still in early July at night, but there are plenty of firewood to purchase.  There are some interesting fish restoration projects happening from the lake up the creek that runs along the campground.  There are several nice sites by the water that I made notes for future reference:

14 is a good single lakeside site

18/17 would be great to reserve side/by/side as they are a bit open to each other

20 is nice, but right next to the boat ramp.