O-4
Bascule drawbridgeO-4 is a bascule drawbridge with 7 ft of clearance closed, measured to a local datum. Open, it is charted at 20 ft.
Clearances are from NOAA chart US5NY6EX, measured to a local datum. Actual clearance is lower whenever the water stands above that level. Always confirm against your vessel's air draft and the posted clearance gauge before transiting.
Pathr nautical charts
O-4 on the chart
Find the bridge and its charted vertical clearance in one view. Select a pin to compare nearby bridges, see open and closed clearances where charted, and open its operating details.
How to request an opening
We don't have this bridge's operating rule yet. Many drawbridges open on a schedule or need advance notice. Check 33 CFR 117 for New York or call the tender before you plan around it.
Frequently asked
What is the clearance under O-4?+
O-4 is a bascule drawbridge with 7 ft of clearance closed, measured to a local datum. Open, it is charted at 20 ft. These figures are from NOAA chart data. Real clearance drops whenever the water stands above the level they are measured to, so leave a margin for your air draft.
How do I get O-4 to open?+
Contact the bridge tender on VHF-FM, or sound the required signal. We don't have this bridge's operating rule yet. Many drawbridges open on a schedule or need advance notice. Check 33 CFR 117 for New York or call the tender before you plan around it.
