Streamflow data for whitewater paddlers.
H2OFlows is a free, open source gauge dashboard built by paddlers. Monitor your favorite rivers, set flow alerts, and explore reach data — all in one place.
Everything you need to check the river
Live Gauge Dashboard
CFS readings, sparklines, trend indicators, and 48-hour flow history for every gauge on your watchlist. Multi-dashboard support keeps different runs organized.
Flow Band Labels
Community-defined flow ranges (Too Low / Minimum / Optimal / Pushy) overlaid on live CFS. See at a glance if your run is on.
Reach Pages
Put-in and take-out coordinates, rapid inventory, access notes, and current conditions — all tied to live gauge data.
Flow Alerts
Get notified when a gauge crosses a threshold you care about. SMS, push, and Discord alerts coming in Phase 3.
KMZ Import
Build a reach in Google My Maps and import it directly. The importer reads pin prefixes and folder names — no SQL required.
Public API
All reach and gauge data is freely accessible via API. Build your own tools on top of the H2OFlows data layer.