FloodRoute 2.5.1

FloodRoute shows which coastal roads will flood at high tide, and when, and lets neighbors post what they're seeing.

As featured in The Ark (Tiburon, CA), January 27, 2026.

WHAT IT DOES
• Street-by-street forecasts: see which roads and bike paths flood at each high tide, and when the water peaks and drains, 7 days ahead.
• Live water levels: forecasts follow the real water, catching surges the tide tables miss. Over the past year, forecasts made a day ahead typically landed within 2 inches of NOAA's gauge; the tide tables alone, 6. Every call is public at floodroute.com/accuracy.
• Flood photos from neighbors: see what's flooding right now. Tap any photo for the street, the time, who spotted it and the map.
• Post in seconds: snap the water and FloodRoute adds the street, the time and the tide height. Faces are blurred automatically. At high tide, one tap tells neighbors "Flooded" or "Looks dry."
• Warn your neighbors: share a forecast or a photo to Nextdoor, Instagram or a group text in one tap. Links open a live map in any browser, no app needed.
• Alerts: a heads-up before your town floods, a ping when a neighbor posts flooding in your town, and a check-in at the peak.
• A map that learns: neighbor reports correct the forecast, so streets seen dry stop showing as flooded.
• Call it: guess how high the next big tide will get. NOAA's gauge decides who was closest, and the best callers top a 30-day leaderboard.

FREE FOR EVERYONE
• The live flood map and 7-day flood windows
• Town alerts and neighbor flood pings
• Posting and sharing flood photos
• No account or login

FLOODROUTE PRO
• Alerts for your street: the roads around your home, hours ahead
• Commute alerts: we check your actual route and tell you when to leave
• Surge alerts: when the water runs high, before the tide tables catch on
• Up to 3 places: home, work and one more
• 30-day flood planner
• What-if simulator: see any tide or storm before it happens
• A PRO badge on your posts

New users get every Pro feature through their town's next big tide. After that, everything free stays free, and Pro is monthly or yearly.

WHERE IT WORKS
• Marin County, CA: 11 towns, from Sausalito to Novato
• San Francisco, CA
• Boston, MA
• New York City, NY
• Miami and Miami Beach, FL
• Tampa, FL
• In beta: much of South Florida, St. Petersburg, Charleston, Norfolk, Virginia Beach and more

HOW IT WORKS
FloodRoute combines NOAA tide predictions and live water levels with high-resolution USGS lidar elevations for every low-lying road. Predictions are calibrated against documented king tides and neighbor reports, and factor in recent rainfall. Every town also has 30 years of flood history at floodroute.com.

DATA SOURCES
• NOAA CO-OPS: tide predictions and live water levels
• USGS 3D Elevation Program: road elevations
• OpenStreetMap and Overture Maps: road geometry
• FEMA National Flood Hazard Layer: flood zones
• Open-Meteo: rainfall and barometric pressure
• Neighbor reports and documented king tide flooding: calibration

WHY I BUILT IT
FloodRoute started with my Nextdoor neighbors in Marin County. I shared the idea and got nearly 200 requests in 24 hours. It's still built by one person, and Pro keeps the free map free.

IMPORTANT SAFETY NOTICE
FloodRoute provides estimates only and is not a substitute for official warnings. Conditions change quickly. Never drive or walk through flood water: turn around, don't drown.

SUBSCRIPTION DETAILS
Payment is charged to your Apple ID at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings.

Support: marc@floodroute.com
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