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Hi, not sure where you are or what river, but jet drives are not good for shallow sandy waters. The sand acts like sandpaper and poor performance and the longivity of the engine suffers greatly. Usually jet drive engines are used in relatively shallow waters with rocky or gravel bottoms. Even in gravel they sometimes run into problems with the impellers and intakes.
You may want to look into one of the more modern mud engines. Being air cooled four stroke they run well in sandy, weedy shallow waters. In my area they are being used extensively in flooded rice impoundments for duck hunting.
Thanks post back with further questions.