I have a possibility of getting on a San Juan trip starting at Mexican Hat around April 19 or so. Seems like I've heard 500cfs is a minimum flow for rafts -- and even that may require some dragging, right?. Also seems like I heard that the flows around then will likely be 500 to 1000, sound right? I'm thinking about waiting for another opportunity on the San Juan in hopes of a more reliable flow/fun trip. Thoughts?