What you heard is right. Put in at High Bridge and head up river the Dix is just past the bridge on the right, can't miss it. You will not make it all the way to the dam in anything other than a canoe or kayak. You hit a shallow riffle at the spillway and you're as far as you can get unless you can drag your boat over a rock bar. Because of this, it seems like the best fishing is right up on the dam where there is little fishing pressure. Another thing to note is the no live bait restriction once you get up the Dix a certain ways.

Great trip. Hope you have fun.

Steve