You should get the book Arkansas River Guide by Thomas G. Rampton. It has mile-by-mile descriptions from Granite to Canon City.
I've never scouted every rapid on Brown's, as most are read and run. Some are also pretty close together so it's hard to get out and get back in. If you wait until 10am to put on, you can just follow the hoards of commercial boats. Oh yeah, and smile at Zoom flume - they're taking your picture