What is the clearance of the swing span of the Irondequoit Bay Outlet bridge?

The clearance of the swing span of the Irondequoit Bay Outlet bridge is indeed 8 feet. This measurement is crucial for navigation as it determines the maximum height of vessels that can pass underneath the bridge without requiring the span to be opened. The clearance is especially important for smaller boats, which need to be aware of these dimensions to ensure they can safely navigate under the bridge without risking damage.

Vessels that are taller than the clearance height would either need to wait for the bridge to swing open, which is not always feasible or sometimes might need to find an alternate route to avoid the bridge entirely. Understanding the bridge clearance assists boaters in planning their journeys and maintaining safety while navigating the waterways.

Larger options for clearance mentioned in the choices do not apply, as they exceed the actual specifications of the bridge; therefore, they would be inaccurate representations of the navigational height available beneath the structure.