Evacuation by Boat: Waterway Evacuation Planning

When Waterway Evacuation Makes Sense

Roads flood faster than waterways rise to dangerous levels. In flood scenarios, hurricanes, and coastal emergencies, water-based evacuation is sometimes the only option — and sometimes the fastest.

The context where boat evacuation is clearly appropriate:

• Roads are flooded and impassable by vehicle
• Your primary location is coastal or waterside with water access but compromised road access
• Your primary evacuation destination is accessible by water more reliably than by road
• You have a vessel, the skills to operate it, and a pre-planned route

Boat evacuation for someone without boating experience, without a planned route, and without a vessel suited to the conditions is a survival scenario, not a preparedness solution. The preparation has to happen before the emergency.

Vessel Selection for Evacuation

Flat water (ponds, calm lakes, flooded fields, slow rivers):

A kayak, canoe, or flat-bottom jon boat handles flat, calm water. Kayaks and canoes are human-powered, quiet, and capable in 4-8" of water — useful for flooded streets and fields. A 10-foot aluminum jon boat (50-100 lbs, trailer-storable) with a 5-9.9 hp outboard motor covers flat water at 10-15 mph and can carry 400-600 lbs of load.

Moving rivers:

River evacuation requires a vessel appropriate to current speed and depth. Class I-II water (gentle current, easy obstacles) is manageable in a stable canoe or jon boat. Class III+ water (rapids, significant current) requires whitewater kayaking skills that most people don't have. Know the flood-stage behavior of any river in your route — a river that's Class I at normal flow may be Class III-IV at flood stage.

Coastal and open water:

Coastal evacuation by water requires a keel-equipped vessel suited to open water conditions. A flat-bottom boat in ocean conditions is dangerous. Wind, wave height, and weather windows matter. If your evacuation route involves coastal or open-water navigation, the boat and skills required are substantially different from inland water scenarios.

Vessel maintenance:

An emergency-use boat that hasn't run in 18 months has a high probability of not starting when you need it. Outboard motors require periodic maintenance: fresh fuel (stabilized), flushing after salt water use, impeller checks. A boat motor that fails on flooded, debris-filled water is not just inconvenient — it's a dangerous scenario.

Route Planning

Before any emergency:

Identify your waterway evacuation routes using:

• USGS topographic maps (available free at the National Map, maps.usgs.gov)
• Nautical charts for coastal and large inland water areas (NOAA charts for US coastal waters)
• Google Earth/Maps with satellite view to identify waterway routes and obstacles
• Local knowledge (talk to people who fish, paddle, or boat your area's waterways)

Key information for each route:

• Distance in nautical miles or statute miles
• Significant obstacles (bridges with limited clearance, dams, locks, rapids)
• Expected current direction and flood-stage behavior
• Access points and put-in/take-out locations
• Destination access: can you get out of the water at your destination?

Bridge clearance matters in flood conditions. A bridge you pass under easily at normal water level may have 12 inches of clearance at flood stage. Know the bridge heights on your route.

Current direction during flooding:

Flood currents move faster than normal and in directions that may not match the normal river flow. Tributaries can run backward (upstream) during major flood events as they back up. Know where the water goes in your area when a major event hits — this is different from where it normally goes.

Loading and Capacity

The capacity rule:

Never load a small boat to capacity during emergency evacuation. Rated capacity assumes calm conditions and no wave action. In emergency conditions (debris, current, wind), operating at 60-70% of rated capacity provides needed stability margin.

A typical 12-foot aluminum jon boat rated for 2-3 people at 500-600 lbs should carry 3-4 people maximum in calm emergency conditions, with no more than 350-400 lbs total in rough water.

Loading priority for boats:

People first, then essential go-bags, then fuel. Boats that get water over the gunwale (the sides) can capsize in seconds. High-sided loads that raise the center of gravity dramatically increase this risk. Keep loads low and centered.

Life jackets:

Every person in the boat needs a properly fitted life jacket that is on their body, not stored under a seat. Children: Coast Guard-approved Type II or III jacket, properly sized. In swift-water or coastal conditions, a Type III or V jacket with whitewater features provides significantly better protection.

Navigation Without Technology

GPS and smartphones can fail — dead batteries, water damage, network outage. Navigation without technology on water:

Compass and bearing:

Know the direction of travel from your origin to your destination. A magnetic compass (not a phone compass) remains functional without power. A boat compass or handheld compass and a paper chart allows you to follow bearings.

Landmark navigation:

On rivers, follow the current (downstream typically). On inland lakes, navigate by identifiable landmarks. Know major geographic features of your route well enough to recognize them from the water level.

Pre-downloaded offline maps:

Apps like Navionics, Gaia GPS, and NOAA Chart Viewer allow downloading chart sections for offline use. Download your routes before an emergency while connectivity exists.

The Specific Dangers

Submerged obstacles in flood water:

Flooded areas contain invisible fences, vehicles, playground equipment, debris, and downed power lines. Move slowly in flood water. A trolling motor or paddling allows you to feel obstacles before running into them at speed. Running an outboard motor at full throttle through flooded residential areas can result in striking submerged objects that destroy propellers, puncture hulls, or capsize boats.

Downed power lines on water:

Electrified water is lethal. If you see a power line down near or in water, treat the surrounding water as energized and avoid it. The zone of electrification extends significantly from the entry point.

Hypothermia in cold water:

Cold water extracts body heat 25 times faster than cold air. Immersion in 50°F water causes loss of useful movement in 30-60 minutes. A dry suit or neoprene wetsuit dramatically extends survival time. Immersion during a cold-weather boat evacuation is a medical emergency. Prevention (stable boat, life jackets, not overloading) is the plan.

Night navigation:

Avoid night evacuation by water if possible. Obstacles are invisible, navigation is difficult, and cold exposure risk increases. If night navigation is unavoidable: move slowly, use a spotlight, have someone at the bow watching for obstacles.

After the Water Evacuation

Once you reach your destination:

• Secure the vessel if you may need it again
• Note any route obstacles or conditions that were different from expected
• Report any dangerous conditions (downed lines, major debris blockages) to emergency management via radio or when communications are restored