Landslides risk in Louisiana

Landslide Characteristics in Louisiana

Louisiana is not the first state that comes to mind when thinking about landslides. Its landscape is defined by low-lying coastal plains, wide river deltas, and extensive wetlands, with very little topographic relief. According to the USGS Landslide Hazards Program, landslides require sloping ground and a trigger such as heavy rainfall, seismic shaking, or rapid erosion—all of which are less widespread in Louisiana than in mountainous states. The state’s overall risk is rated Level 1 of 5, meaning very low.

However, low risk does not mean zero risk. The most landslide-prone areas are the bluffs along the Mississippi River, especially in the eastern and central parts of the state. These steep, sediment-rich banks can become unstable when saturated by prolonged rain, river flooding, or when hurricanes push storm surge and heavy precipitation. Coastal areas also face bank and levee collapse due to wave action and fast-moving water. Some of these events are technically “bank failures” or “coastal bluff slumping” rather than classic landslides, but they cause similar ground movement.

There is no distinct landslide season in Louisiana, but the hurricane season (June through November) brings the highest risk. Storms like hurricanes and tropical storms can drop a foot or more of rain in a short time, saturating the ground and destabilizing slopes. Also, the New Madrid Seismic Zone in the northern portion of the state can produce ground shaking strong enough to trigger lateral spreading or slumping along riverbanks, although this is rare.

Because Louisiana’s subsurface is made up of loose sands, silts, and clays, many “landslide” reports in the state are actually subsidence or sinkhole-related events. These involve the ground sinking or collapsing rather than sliding down a slope. Still, the effects on a home can be similar: cracked foundations, shifted driveways, and broken utility lines.

How It Affects Homes

When a landslide or bank failure occurs, the damage can be severe. A home sitting on or near an unstable slope can experience:

• Foundation cracks and structural shifting as the ground moves away.
• Broken underground pipes for water, sewer, or gas.
• Collapsed retaining walls that support driveways or landscaping.
• Blocked access if mud, debris, or earth slides onto roads or driveways.
• Moisture intrusion and mold when water accumulates behind a failed slope.

In Louisiana, most landslide damage is tied to flood-induced erosion. During a flood, a river or bayou can undercut its banks, causing the soil above to slump. Coastal erosion from hurricanes can also eat away at the ground beneath homes, leading to collapse. These events often overlap with flood damage, making it difficult to separate causes.

From an insurance perspective, it is important to know that standard homeowners policies generally do not cover landslides or earth movement. The Louisiana Governor’s Office of Homeland Security and Emergency Preparedness (GOHSEP) advises residents to read their policies carefully. A separate flood insurance policy from the National Flood Insurance Program (NFIP) will cover flood water damage, but it will not cover the land movement itself. Some private insurers offer earth movement endorsements or standalone coverage, but they are not common in Louisiana and may be expensive. If you live near a bluff, riverbank, or levee, ask your agent about this option.

How to Prepare Your Home

Even with a low overall risk, taking simple steps can reduce the chance of damage. Ready.gov recommends the following approaches:

• Maintain drainage – Keep gutters, downspouts, and storm drains clear so rainwater flows away from slopes instead of soaking into them.
• Direct runoff away – Install a French drain or swale to carry water downslope in a controlled manner, especially around foundations.
• Inspect sloping property – If you live on or below a bluff, look for small cracks, bulges in the ground, or leaning trees. These can be early warning signs.
• Plant deep-rooted vegetation to help hold soil in place on gentle slopes. Avoid heavy watering on steep areas.
• Build retaining walls or other engineered structures if needed, but hire a geotechnical engineer to design them. Do not pile soil or boulders on the edge of a slope.
• Watch for changes after floods or storms – Walk your property and note any new cracks, tilting fences, or unusual mudflows.
• Have an evacuation plan – If you live in a high-risk bluff area, know how to reach higher ground quickly if warnings are issued during a hurricane or severe storm.

Frequently Asked Questions

Are landslides common in Louisiana?

No, they are rare. Louisiana is mostly flat, and the state is rated Level 1 of 5 for landslide risk. However, localized ground failures can occur along river bluffs, coastal escarpments, and man-made levees, especially during heavy rain or flooding events. These are often called bank failures or slumping rather than landslides.

Does homeowners insurance cover landslide damage?

Generally, no. Standard homeowners policies exclude earth movement, including landslides, mudflows, and sinkholes. Flood insurance from the NFIP covers damage from water but not the land movement itself. You may need a separate earth movement policy or endorsement, which is not common in Louisiana. Contact your insurance agent to understand your coverage.

What should I do if I see signs of a landslide?

If you notice new cracks in the ground, a tilted tree, a stuck door, or a bulge in a slope, treat it seriously. Keep family members and pets away from the area, and report the issue to your local emergency management or public works department. During a rainstorm or hurricane, if you see moving earth or hear unusual rumbling, evacuate immediately. The GOHSEP website has emergency guidance and contact numbers for each parish.

Official Resources

• Louisiana Governor's Office of Homeland Security and Emergency Preparedness
• USGS Landslide Hazards Program
• Ready.gov – Landslides & Debris Flow