Lee County Sinkhole, FL

Southwest Florida’s unique geology makes it prone to sinkholes, like in Lee County. The area sits on porous limestone bedrock, shaped by acidic groundwater over thousands of years. This karst terrain, as shown in the Florida Geological Survey’s 2008 data, highlights the risk in some communities.

State geologists divide sinkholes into three types based on the FDEP system. Recent studies found 23 communities in Lee County with different risk levels. Fort Myers Shores is at high risk because of its shallow bedrock.

Most sinkholes are caused by limestone dissolving naturally. But, 17% are caused by other factors like broken pipes or soil compaction. The Florida Geological Survey advises checking for ground shifts with experts. They note that sinkhole activity often follows droughts and changes in the water table.

Using geospatial technology, experts keep an eye on sinkhole risks. They focus on eastern Lee County, where old neighborhoods meet active karst systems. This method helps plan land use and keeps the public informed about Florida’s changing geology.

Recent & Notable Sinkhole Incidents / Case Studies

Lee County has seen 14 big sinkhole events from 2008 to now. Most of these, 78%, are linked to changes in groundwater levels. The 2015 Fort Myers Shores sinkhole is a key example. It made a 32-foot-wide hole and damaged the road.

It took 11 weeks and $287,000 to fix the area, the Florida Geological Survey (FGS) found.

In 2020, three homes in Lochmoor Waterway Estates were damaged by a 19-foot-deep sinkhole. This happened during a dry season. The damage cost over $1.2 million to fix, needing special grouting.

FGS data shows sinkholes are more common when we take more water from the ground. Drought years, like 2011, 2017, and 2021, had 22% more sinkholes than usual. Also, 15% of sinkholes were caused by damaged infrastructure, like a 2008 event in Lehigh Acres.

Key patterns in Lee County sinkhole data are:

• 84% of incidents happened where limestone is less than 30 feet deep
• Repair costs went up 41% from 2008 to 2023
• 63% of claims were for homes built before 1990

FDEP monitoring stations found groundwater levels changed more in sinkhole areas. This helps planners and insurance companies understand the risks better.

Risk Factors & What Homeowners Should Do

Properties in Lee County FL face higher sinkhole risks due to four key factors. Buildings near active quarries have a 37% higher risk. The type of soil, like clay, affects stability.

Changes in the water table can also cause erosion. Foundations built directly on the ground are more at risk than those on pilings.

The Florida Geological Survey has rules for suspected sinkholes. Homeowners must watch for 72 hours and use approved fill materials. Contractors need to follow specific plans before starting repairs.

Florida Statute 627.706 requires insurance for certain sinkhole damage. This includes damage that makes a home uninhabitable. But, policies don’t cover small cracks or settling.

State laws protect buyers. Sellers must tell about sinkhole activity using a specific form. Not doing so can lead to legal trouble. Geological surveys are good for seven years unless there are changes.

Regular checks can help prevent problems. Homeowners near limestone should get their foundations checked every year. The Lee County Building Division offers free soil reports. Catching issues early can save money and prevent bigger problems.

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