How Shallow Can A Boat Go? [Feet?]

There are a few key points about owning a boat that every boat owner must know.

One of those key points is knowing how deep your boat can go in water. What is too shallow for your boat and what to know about navigating shallow waters.

Every boat is different, but let’s give you a general idea of how deep of water your boat can navigate.

3 Feet – Don’t Go Below This!

Every boat is different, but in general, you should not drive your boat in no less than 3 feet of water.

Every boat is different, sail boats and large cruisers need more, pontoons can go a little lower, and ski boats can be split. But overall, 3 feet is a good starting point for most average boat owners.

There are several good reasons for 3 feet, even though your boat draft maybe 18 or 24 inches. Let’s go over why 3 feet is a good starting point and why you should not go lower.

Why 3 Feet For Depth?

The lowest point of your boat will be the lower-unit from your boat engine. If your boat is going to hit anything, that will mostly be the thing to get hit. Better yet, the skeg will get hit, as it’s the little fin/rudder below the prop.

For many boats, they only need 2 feet, or even less, to float.

But floating and driving are two very different things.

When the engine is on and the boat put into gear, the prop spins and kicks up everything around it. This means rocks, sand, sea life, plant life and more gets kicked up and can beat or jam up the prop. Not only that, but your boat’s water pump can suck it up and get clogged. The water pump on your boat is used to keep your boat engine cooled, and the intake is near the prop.

It also makes it harder to see the bottom of the water, which is usually hard enough to see.

Shallow Water Boats

Of course, all this depth talk depends on the boat, and some boats are made to go in shallow water.

For example, an airboat can go in the most shallow of water, even land if you like, as it has a flat bottom and uses a large impeller to propel it.

When I give the 3 feet advice, it’s for most general purpose boats. Not the airboats, not the sail boats, and definitely not the large cruisers, even though it’s still good advice for some outliers.

We’re talking about the average person’s pontoon, bowrider, skiboat and similar.

Don’t Trust Depth Finders

Modern digital depth finders are quite good, but a lot of them have a dirty secret.

You need to know if your depth finder works while underway or when standing still. Many depth finders can only take a measurement when standing still, which makes it hard if you operate your boat in shallow waters.

I suggest sticking with the fish finder and depth finder combos as they work better and ten to update even when the boat is in motion. Avoid the cheaper options, and get something good, as the cheaper ones often only read when standing still or going really slow.

I would not make my depth finder my one true source for depth, especially when getting below 5 feet. Your eyes and gut feeling need to be given more weight, as I’ve had depth finders read too late or read the wrong depth far too many times.

Trolling In Shallow Waters

If you raise your engine out drive or motor and put down the trolling motor, you can get away with more shallow waters. It then comes down to the draft of your hull, which your owner’s manual tells you the depth.

This is a common thing for fisherman to do, but they also have boats that can go in shallower waters.

For most boats, I would not start the engine and move away until you get above 3 feet of water to protect your boat.

Jet Boats Need To Stick To 3FT, Too

Since a jet boat impeller is tucked inside, that must mean it can go in shallow water, right?

No, a jet boat should stay above the 3 feet water rule too.

A jet boat is just a giant vacuum, and going in shallow water will suck up sand and rocks, which will jam up the jet drive system and even stop the engine.

While a jet boat may not have anything hanging low like other boats, it still can only go so deep in the water.

I know there are outboards that have the jet drive setup, but I still suggest staying above 3 feet. Too low, and you suck up sand and rocks, and you’ll learn the lesson the hard way eventually.

More Great Info

How shallow a boat can go is a simple topic, but can get complicated fast.

So, when I found this great video, I had to add it, as it really expands even more on the subject: