I'm sure that Boatcop will give some direction. It is my understanding that there is no defined speed limit on Federal Waterways. A vessals speed is determined by 'conditions'. If you hot rod at night, especialy on a crowded waterway like the Parker Strip, you can be sited for 'careless & reckless operation of a watercraft'. This is pretty subjective as the officer can impound your boat if you are naughty!
Speed is "Reasonable and prudent for the conditions, taking into account all hazards that may be present."
Day or night.
The only way we could impound the boat, is if it was used in the commission of a Felony, involved in a collision, or has altered or fictitious registration, hull or engine/drive numbers. If the operator is arrested and there is no one to release the boat to, we'll have it towed and stored, but the owner can pick it up at any time.