Source timestamp
Live tool results show when NOAA observed or predicted the value and when BoatWaypoint retrieved it.
NOAA-backed · U.S. coastal waters
Know the water window before you cast off.
BoatWaypoint turns NOAA tide and bridge air-gap feeds into practical passage-planning answers — with the source, timestamp and assumptions kept visible.
Live NOAA observationsHigh/low predictionsNo account required
One decision, multiple feeds
Stop stitching the answer together tab by tab.
Bridge passage planning often means jumping between a bridge page, tide chart, weather tab and your own boat specs. BoatWaypoint starts with the pieces NOAA can answer reliably and keeps every calculation transparent.
01Pick a stationSearch the NOAA station network or open a known bridge.
02Add your boatEnter air draft and the planning buffer you want to preserve.
03Read the marginSee observation time, measured air gap, required clearance and remaining margin.
Measured bridge air gap
Start with bridges that publish NOAA sensor data.
These are not generic bridge-height pages. Each card is tied to a specific NOAA CO-OPS air-gap station.
NOAA air-gap stationVerrazzano-Narrows BridgeThe Narrows · New YorkCheck latest observation →NOAA air-gap stationBayonne BridgeKill Van Kull · New JerseyCheck latest observation →NOAA air-gap stationBen Franklin BridgeDelaware River · PennsylvaniaCheck latest observation →NOAA air-gap stationDelaware Memorial BridgeDelaware River · DelawareCheck latest observation →NOAA air-gap stationReedy Point BridgeChesapeake & Delaware Canal · DelawareCheck latest observation →NOAA air-gap stationChesapeake City BridgeChesapeake & Delaware Canal · MarylandCheck latest observation →NOAA air-gap stationBay Bridge — 170 ft East of CenterChesapeake Bay · MarylandCheck latest observation →NOAA air-gap stationChesapeake Bay Bridge — Center ChannelChesapeake Bay · MarylandCheck latest observation →NOAA air-gap stationDon Holt BridgeCooper River · South CarolinaCheck latest observation →NOAA air-gap stationRavenel BridgeCooper River · South CarolinaCheck latest observation →NOAA air-gap stationTalmadge Memorial BridgeSavannah River · GeorgiaCheck latest observation →NOAA air-gap stationDames Point BridgeSt. Johns River · FloridaCheck latest observation →NOAA air-gap stationSunshine Skyway BridgeTampa Bay · FloridaCheck latest observation →NOAA air-gap stationCrescent City Connection BridgeMississippi River · LouisianaCheck latest observation →NOAA air-gap stationHuey Long BridgeMississippi River · LouisianaCheck latest observation →NOAA air-gap stationI-10 Horace Wilkinson BridgeMississippi River · LouisianaCheck latest observation →NOAA air-gap stationLake Charles I-210 BridgeCalcasieu River · LouisianaCheck latest observation →NOAA air-gap stationVincent Thomas BridgeLos Angeles Harbor · CaliforniaCheck latest observation →NOAA air-gap stationLong Beach International Gateway BridgePort of Long Beach · CaliforniaCheck latest observation →NOAA air-gap stationSan Francisco–Oakland Bay BridgeSan Francisco Bay · CaliforniaCheck latest observation →
Tides
The next useful low may matter more than today’s headline tide.
Use a NOAA prediction station to scan the next 24–72 hours of high and low water. We preserve the MLLW datum label so a number never floats free of its reference.
Open Tide Window →Florida ICW
A better pre-departure routine for bridge-heavy cruising.
Use one checklist for air draft, bridge references, tide timing, opening restrictions, weather and notices — then verify the critical items at the source.
Florida ICW planner →Built to show its work
Numbers with provenance, not mystery scores.
Your assumptions
Air draft and buffer stay visible beside the result. Change either input and the margin recalculates.
Hard limits
We flag what the data cannot establish: exact position across a span, temporary restrictions, vessel motion or an official navigation clearance.
Start with your limiting dimension
Run the clearance checkWhat’s your boat’s air draft?
If a fixed bridge is the question, that one number plus your preferred buffer is the fastest place to start.