The 2007 accident at Six Flags Kentucky Kingdom involved a catastrophic mechanical failure on the Superman: Tower of Power ride. On June 21, 2007, a snapped cable severed the feet of 13-year-old Kaitlyn Lassiter. This incident led to a nationwide inspection of similar rides, a major lawsuit, and the eventual removal of the attraction before the park’s transition away from Six Flags management.
The Timeline of the June 21, 2007, Incident
The accident occurred on a Thursday afternoon at what was then Six Flags Kentucky Kingdom in Louisville, Kentucky. The Superman: Tower of Power was a "drop tower" ride, designed to lift passengers 177 feet into the air before plunging them back down at speeds reaching 54 miles per hour.
As the ride vehicle ascended with several passengers, a 3/8-inch steel cable snapped. Witnesses reported hearing a loud "crack" or "pop" followed by the sound of the cable whipping through the air. The cable became entangled around the legs of Kaitlyn Lassiter, who was seated on the ride. As the ride continued its programmed movement and the tension shifted, the cable tightened with enough force to sever both of her feet at the ankles.
Immediate chaos ensued as the ride vehicle returned to the loading bay. Park guests and staff rushed to provide first aid. Lassiter was rushed to Vanderbilt University Medical Center. While surgeons were able to successfully reattach her right foot, her left leg had to be amputated below the knee due to the severity of the tissue and bone damage.
Technical Analysis of the Mechanical Failure
To understand how such a catastrophic failure occurred, one must look at the engineering of the Intamin Giant Drop model. These rides rely on a complex system of cables, pulleys, and catch cars.
The Role of the Hoist Cables
The Superman: Tower of Power utilized several steel wire cables to lift the passenger gondola. These cables are subject to immense tension and cyclical stress. Over time, wire ropes can develop "fatigue," where individual strands of the steel wire break internally or externally. Standard maintenance protocols require daily visual inspections and periodic "magnetic flux" testing to identify internal degradations that aren't visible to the naked eye.
Why the Safety Systems Failed
In the Lassiter case, the snapped cable did not merely cause the ride to stop; it became a projectile. The investigation led by the Kentucky Department of Agriculture, which oversees amusement ride safety in the state, found that the cable had snapped and "bird-caged" (unraveled). Because the gondola was in motion, the loose cable wrapped around the rider.
The investigation highlighted a critical gap in ride design at the time: there was no physical barrier or "shroud" to prevent a snapped cable from entering the passenger seating area. While the ride's brakes and drop mechanisms functioned as intended to stop the car, the secondary effect of the cable failure was not mitigated by the ride's existing safety architecture.
Legal Proceedings and the Settlement
In the wake of the accident, the Lassiter family filed a lawsuit against Six Flags, alleging negligence in the maintenance and operation of the ride. The legal battle focused on whether park technicians had ignored signs of cable wear or if the manufacturer, Intamin, had provided inadequate maintenance guidelines.
Allegations of Negligence
The plaintiffs argued that the park failed to properly inspect the cables and that sensors, which should have detected a loss of tension or a cable break, did not stop the ride in time to prevent the injury. Internal maintenance logs became a focal point of the discovery process, with lawyers examining how often the cables were replaced and what type of lubrication was used to prevent corrosion.
The 2008 Settlement
In late 2008, Six Flags and the Lassiter family reached an out-of-court settlement. While the financial terms remained confidential, the settlement was intended to provide for Kaitlyn Lassiter’s lifetime medical care, including the cost of prosthetic limbs and ongoing physical therapy. As of 2026, Lassiter has remained a vocal advocate for amusement park safety, often sharing her story to push for more stringent federal oversight of the industry.
Broader Impact on the Amusement Park Industry
The accident at Six Flags Kentucky Kingdom sent shockwaves through the global theme park industry. The Superman: Tower of Power was not a unique ride; dozens of similar Intamin drop towers were in operation worldwide.
Immediate Industry Response
Following the incident, Six Flags voluntarily shut down all similar drop tower rides at its parks in Missouri, Illinois, and California for inspection. Other major operators, including Cedar Fair, followed suit. Many of these rides remained closed for weeks as engineers performed exhaustive metallurgical tests on the cables and hoist systems.
Changes to ASTM Standards
The incident influenced updates to the ASTM International F24 Committee standards, which govern amusement ride design and maintenance. Key changes included:
- Enhanced Cable Inspection: More rigorous requirements for the frequency and method of non-destructive testing (NDT) on wire ropes.
- Redundancy Systems: Requirements for secondary containment systems to prevent snapped cables from flailing into rider zones.
- Clearance Zones: Increasing the "envelope of protection" around moving parts to ensure that even in the event of a component failure, riders remain out of reach of mechanical debris.
The Evolution of Kentucky Kingdom (2010–2026)
The 2007 accident marked the beginning of a difficult period for the Louisville park. In 2010, amid broader financial struggles and a bankruptcy filing, Six Flags ended its lease with the Kentucky State Fair Board and closed the park.
The Superman: Tower of Power ride was dismantled in 2008, shortly after the investigation concluded. It was never reopened. For several years, the park sat abandoned, a decaying landmark in the heart of Louisville.
Reopening and New Management
In 2014, the park was reopened as Kentucky Kingdom under the leadership of Ed Hart and a group of local investors. The new management took great pains to distance the park from the Six Flags era, investing millions in new, modern attractions with state-of-the-art safety features.
As of 2026, Kentucky Kingdom is owned and operated by Herschend Family Entertainment, the same company that manages Dollywood and Silver Dollar City. Under Herschend’s stewardship, the park has maintained an exemplary safety record. The area where the Superman: Tower of Power once stood has been repurposed for newer attractions that utilize magnetic braking and modern hoist technologies that eliminate many of the risks associated with older cable-driven towers.
Comparison of Ride Safety Technology: 2007 vs. 2026
The technology used in drop towers has evolved significantly since the 2007 accident. The following table compares the safety features of the era with the standards found in modern 2026 attractions.
| Feature | 2007 Standards (Six Flags Era) | 2026 Standards (Modern Era) |
|---|---|---|
| Primary Lift Mechanism | Traditional Steel Wire Rope (Steel Cable) | Linear Induction Motors (LIM) or Carbon-Fiber Reinforced Cables |
| Braking System | Early Magnetic or Friction Brakes | Permanent Magnet Braking (Fail-safe, no power required) |
| Inspection Protocol | Daily Visual / Periodic Magnetic Flux | Real-time Electronic Stress Monitoring & AI-driven Wear Analysis |
| Cable Containment | Open Pulley Systems | Fully Enclosed Cable Raceways and Shrouded Hoists |
| State Oversight | Variable by State (Kentucky Dept. of Ag) | Unified National Safety Data Sharing & Mandatory ASTM Compliance |
| Ride Logic | Basic Limit Switches | Integrated PLC (Programmable Logic Controllers) with redundant "Check-Back" loops |
Frequently Asked Questions
Is the Superman: Tower of Power ride still at Kentucky Kingdom?
No. The ride was permanently closed immediately after the 2007 accident and was dismantled in 2008. The site has since been cleared and replaced by other attractions as part of the park's 2014 reopening and subsequent expansions.
What caused the cable to snap on the ride?
The investigation identified fatigue and wear in the steel cable as the primary cause. Factors such as the constant stress of lifting the gondola and potential inadequacies in the lubrication and inspection of the wire rope contributed to the failure.
How is Kaitlyn Lassiter doing today?
As of 2026, Kaitlyn Lassiter has transitioned into a role as a safety advocate. Following years of surgeries and rehabilitation, she uses a prosthetic limb and has worked with various organizations to highlight the importance of "Kaitlyn's Law" or similar state-level legislation aimed at increasing ride inspection transparency.
Is Kentucky Kingdom safe to visit in 2026?
Yes. Since the park was acquired by Herschend Family Entertainment, it has adhered to some of the highest safety standards in the industry. Modern rides undergo rigorous daily inspections and are subject to oversight by both state inspectors and independent third-party safety auditors.
Did Six Flags own the park when the accident happened?
Yes. At the time of the 2007 incident, the park was branded as Six Flags Kentucky Kingdom and was operated by the Six Flags corporation under a lease agreement. Six Flags surrendered the lease in 2010.
Recommendations for Park Guests
While modern theme parks are statistically among the safest forms of entertainment, guests can take proactive steps to ensure their safety:
- Observe Posted Restrictions: Always adhere to height, weight, and health restrictions. These are engineered based on the ride’s physics and restraint systems.
- Report Abnormalities: If you see a frayed cable, hear an unusual grinding noise, or notice a restraint that feels loose, notify a ride operator immediately.
- Check Inspection Decals: In many jurisdictions, including Kentucky, rides must display a current inspection permit from the Department of Agriculture.
- Follow Operator Instructions: The most common injuries in theme parks today are not mechanical failures but guest-behavior issues (e.g., standing up or reaching out of the vehicle).
The Six Flags Kentucky accident remains a somber chapter in amusement park history, but it serves as the foundation for the rigorous safety culture that defines the industry in 2026. Through better engineering, stricter oversight, and a commitment to transparency, the lessons learned from that day continue to protect millions of park visitors every year.
