You'll want to use the trim to intersection command to get it to the length you want, and then use the add node command to add a few extra nodes so the extended bit doesn't become a straight line.
Or, simply redraw the entire river in CC3. Just use the river drawing tool to follow the existing path, then delete the original river when done. As long as you use the river drawing tool, you can use the Trace functionality to follow the original exactly.
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Or, simply redraw the entire river in CC3. Just use the river drawing tool to follow the existing path, then delete the original river when done. As long as you use the river drawing tool, you can use the Trace functionality to follow the original exactly.