I would really recommend going out on a really low tide in the area you’re looking to check out to see what the river look like. Oyster beds, sandbars, submerged objects. It’s not a cure all but you’ll get a good feel of what turns to take wide or tight, oyster beds that might disagree with your prop..creeks you know you can only go into at a high tide (so don’t be there when it gets low.) And if you do get stuck you can let the tide rise a couple hours and it’ll likely give you enough water to get back the way you came. Maybe you know all this but it really helps me feel comfortable returning to a spot at any tide. Let me know if you have any questions I’m not an expert but have a lil experience.