i am thinking of putting my boat in tomorrow and finally tying it up to our dock for the season. not looking to cruise around yet until the river clears up. i stopped by the dock today and talked to a guy there that said he won't even start his boat in these waters so not to suck dirty water into his engine. is this a concern? i would be dropping in about a mile up river from the dock. its a smaller river that is all no wake area. our marina is right at the end where it dumps into the ohio river. so i'm not too concerned with debris as it is all no-wake through there but will the dirty water hurt the engine?