Yeah, you can't use motors on Pass Lake period, electric or gas. I'd stay outta the salt under the bridge in a boat that small too. There are some rogue currents in there that do all kinds of weird stuff. The average tide change current is 6 knots with maximum is around 9 knots. Whirlpools open up that would look like a category 5 tornado (in reverse) in a boat that small.
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Mark Strand
aka - TC