Dvorak Expeditions wrote the book on the Ark river experience.    Knowledgeable, flexible and LOCAL.  Don't trust out of town outfitters to know the river, it's flow-rate and it's put-in/take-outs like the staff at Dvorak.   Rented a Mini Max raft and was assisted by the staff to safely secure the craft to the roof.  Staff was waiting at the take-out to take the gear back HQ.   Bill's team of extended family is the best in the business.  We will be back.