A spinning crane alarmed Ottawa residents during Thursday’s storm. Experts explain why it’s normal—and vital—for tower cranes to rotate in high winds.
Crane Spins in Ottawa Storm Raise Eyebrows
During a severe storm on Thursday evening, residents across Ottawa were startled by the sight of a construction crane’s boom spinning freely in the wind. Several social media users shared videos of the crane rotating rapidly, prompting concern over the safety of such towering structures during extreme weather.
What Looked Dangerous Was Actually by Design
Despite its dramatic appearance, the spinning movement—known as “weathervaning”—is a built-in safety feature of tower cranes. According to André Brisson, founder and president of Objective Engineering and a leading expert in crane safety, the boom is designed to rotate freely when unattended to reduce wind pressure on the crane’s structure.
Free-Spinning Prevents Structural Collapse
Brisson explained that when a crane is not in use, its rotation mechanism is disengaged, allowing the boom to spin with the wind rather than resist it. “If we didn’t allow it to freewheel, the wind could apply enough force to twist or even collapse the crane,” he said. “This is especially true during intense summer storms with unpredictable gusts.”
When Movement Signals a Real Risk
Although rotation during storms is expected, Brisson notes there are scenarios that could indicate danger. “If the crane is active and materials are being lifted unsafely or parts are shifting unpredictably, especially when the site is closed, it may warrant investigation,” he said. However, passive spinning during high winds is generally no cause for alarm.
Rigorous Inspections Keep Cranes in Check
Crane safety in Canada is tightly regulated. Brisson emphasized that cranes remain on-site for years but undergo thorough inspections daily, weekly, monthly, and annually. These checks cover everything from mechanical components to structural integrity. “Crane safety is not taken lightly,” he added. “They’re maintained with the highest standards in mind.”
Public Concern Understandable, But Unwarranted
The unsettling visuals seen during Thursday’s storm are, in reality, a normal and crucial part of tower crane operations. As urban skylines grow and weather events intensify, understanding these mechanisms can help the public feel more secure. For now, experts assure: if you see a crane spinning during a storm, it’s likely doing exactly what it’s supposed to.
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