The air gap measurements have been updated to reflect the ongoing long-term construction on the Ben Franklin Bridge. The real-time air gap data displayed on CO-OPS’ web page now represents the distance from the bottom of the Safespan scaffolding to the water surface AT the green center channel navigation light. For additional information specific to the navigation channel, please see the latest local USCG Notice to Mariners.

PORTS®: 8545556 Ben Franklin Bridge Air Gap, PA

For information on missing data, go to the PORTS Station Status or call (301) 713-2540.
DISCLAIMER: The air gap systems have been created by NOAA/NOS to provide the maritime community with improved information of bridge clearances. These real-time data are accurate to within ±1 inch. They are released for limited public use as preliminary data to be used only with appropriate caution when clearing the bridge.

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