4WD river and water crossings: how to cross safely

To cross a creek or river safely in a 4WD, stop and assess it first: know your vehicle's manufacturer wading depth, check the depth, current and bottom (walking it only where it is safe and never in crocodile country), engage low range, then enter slowly and drive at a steady pace that creates a small bow wave without pushing water over the bonnet. If in doubt, wait for the water to drop or take another route.

Water crossings can damage vehicles and endanger lives. This guide is general information, not professional training. It is part of our 4WD beginner's guide.

Floodwater is different

A known creek crossing on a 4WD track is not the same as floodwater over a road. Floodwater can hide washed-out surfaces and debris, and fast-moving water can float a vehicle. State emergency services consistently advise people never to drive into floodwater. This guide is about planned crossings in normal conditions.

Know your wading depth

Your owner's manual should list a maximum wading depth. It is the starting point for every decision, but it is a figure for still water. In real crossings:

• Moving water pushes against the side of the vehicle and can shift it.
• Soft or rocky bottoms can drop a wheel into a hole.
• Bow waves raise the water level at the front.

Treat the manufacturer's figure as an absolute limit, not a target. Modifications such as a snorkel do not change your diff or gearbox breathers, electrics or door seals unless they have been specifically addressed.

Assess the crossing

Stop well back and look. Then:

1. Check depth. Look for a depth marker; use a long stick; watch another vehicle cross.
2. Check current. Throw a stick upstream and watch how fast it travels. If the water is moving quickly, do not cross.
3. Check the bottom. Is it sand, gravel, rock or mud? Are there holes or logs?
4. Check entry and exit points. A steep or slippery exit can trap you halfway out.
5. Walk it, but only where it is safe. In southern Australia, walking a slow, shallow crossing is common practice. Never walk crossings in crocodile country.

Crocodile country

Saltwater crocodiles live in rivers, creeks, estuaries and billabongs across northern Australia, including northern Queensland, the Northern Territory and the Kimberley in WA. Government agencies such as the Queensland Government advise visitors to be "crocwise".

In crocodile country:

• Never walk a crossing to check its depth.
• Do not stand at the water's edge or clean fish or dishes there.
• Use depth markers or watch other vehicles cross instead.
• Obey all signage.

See our Kimberley, NT and Queensland pages for regional planning.

Prepare the vehicle

• Low range, usually first or second gear in a manual, or low range drive in an automatic. See low range and diff locks.
• Water bra or tarp over the front to reduce water into the engine bay, if you carry one and know how to fit it. Remove it straight after.
• Fan: some older vehicles have a fan that can be damaged in water; follow your manual.
• Windows: many drivers crack a window so they can exit if the electrics fail.
• Recovery gear rigged and ready on the exit side, with another vehicle positioned to help. See recovery basics.

Driving the crossing

1. Enter slowly to avoid a big splash into the engine bay.
2. Build a gentle, steady pace that creates a small bow wave in front of the bumper. That lowers the water level just behind it around the engine.
3. Keep a steady throttle. Do not stop or change gear mid-crossing.
4. Follow your planned line.
5. Exit steadily and keep moving until you are clear.

One vehicle crosses at a time. Others wait until it is safely out.

If it goes wrong

• If the engine stalls, do not try to restart it. Water in the cylinders can cause severe engine damage. Get everyone to safety, then recover the vehicle backwards.
• If the vehicle starts to float or slide, get out on the upstream side only if it is safe, and move to safety. A vehicle can be replaced.

After the crossing

• Dry the brakes by applying them gently while driving slowly.
• Check for water in the air filter, engine oil, diffs and gearbox if the crossing was deep.
• Remove the water bra if you used one.
• Wash salt water off as soon as possible after tidal or beach crossings.

Members post crossing conditions on the tracks and parks board.

Respect the waterway

Creek and river crossings are sensitive environments. Cross only at established crossings, do not drive along creek beds, and avoid crossing when water is high. The Tread Lightly guide explains how to minimise your impact.

Where to go next

• Back to the 4WD beginner's guide
• Remote area 4WD safety
• Recovery basics
• Kimberley and outback driving
• 4WD FAQ