Lostmans River Below Second Bay flow report
As of July 12, 2026, Lostmans River Below Second Bay is flowing at 4,650 cfs with a gage height of 0.01 ft, receding 62% over the past 24 hours. Source: USGS gauge #02290918, refreshed throughout the day.
Historical Data
Lostmans River Below Second Bay at a glance
How Lostmans River Below Second Bay is running right now, where it sits on the map, and the key gauge stats.
Lostmans River Below Second Bay is flowing at 4,650 cfs, with the water sitting 0.01 ft at the gage. Flow is down 62% since yesterday as the gauge recedes.
This is USGS gauge #02290918 in Florida. Over the past 10 days the average has been 8,471 cfs, peaking at 12,300 cfs.
Over the next 5 days, Lostmans River Below Second Bay is expected to hold near today's 4650 cfs, toward roughly 4537 cfs by 2026-07-17 (likely range 2575-7993 cfs) -- running well below the seasonal normal.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Florida flow report.
Streamflow Forecast
Powered by PULSE — Snoflo’s Predictive Unified Learning & Simulation Engine, which learns from how this river has answered every past storm, snowmelt, and dry spell to forecast where it’s headed with a precision generic models can’t match.
How does this compare to past years?
Year-over-year overlay, annual peak discharge, the full distribution of daily flows on record, and the gauge's rating curve.
Weather Forecast
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day forecast
Daily temperatures, snow, and rain projected over the next two weeks.
Lostmans River Below Second Bay
The main source of its flow is rainfall, with some contribution from groundwater. There are no significant tributaries or dams that affect the flow of the river. The hydrology of the Lostmans River is characterized by seasonal variations in flow, with high flows occurring during the wet season and low flows during the dry season. The river is also impacted by storm surge events, which can cause sudden and significant increases in flow. Interestingly, the Lostmans River is home to a unique ecosystem of mangrove forests and other wetland habitats that are adapted to the natural fluctuations in flow.
Nearby streamflow levels
Cross-check Lostmans River Below Second Bay's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Lostmans River Below Second Bay | 4,650 cfs |
| Broad River Near The Cutoff | 225 cfs |
| Chatham River Near The Watson Place | 1,410 cfs |
| Bottle Creek At Rookery Branch Nr Homestead | 12 cfs |
| North River Upstream Of Cutoff Near Flamingo | 156 cfs |
| Tamiami Canal Outlets | 1 cfs |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Lostmans River Below Second Bay.
Boat launches
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River levels & flood safety
- Read the level before you go
- A river that's runnable at one flow can be deadly at another. Check current discharge and gage height — like the values shown above — against the flood-stage thresholds, and remember levels can spike fast after rain or a dam release.
- Respect cold water
- Snowmelt rivers run cold even in summer. Sudden immersion triggers cold-water shock and saps strength within minutes. Wear a PFD, dress for the water temperature (not the air), and never wade or paddle alone.
- Watch for swiftwater hazards
- Strainers (downed trees), undercut rocks, and low-head dams are the deadliest features on moving water. High, fast, muddy water hides them. If in doubt, scout from shore and portage.
- Mind flash floods & releases
- Narrow canyons can flood from a storm miles upstream, and dam-controlled reaches can rise without warning. Know the forecast, the release schedule, and your exit before you launch.
Track Lostmans River Below Second Bay in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Lostmans River Below Second Bay crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Lostmans River Below Second Bay
Where does the streamflow data for Lostmans River Below Second Bay come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 02290918. Snoflo refreshes the time series throughout the day. Forecasts come from the NOAA / yr.no feed Snoflo's iOS app uses.
How often is the report updated?
USGS gauges report continuously (typically every 15 minutes). Snoflo pulls fresh values throughout the day — look for the "as of" timestamp on the streamflow hero card.
What's the difference between discharge and gage height?
Discharge (cubic feet per second, or cfs) is the volume of water flowing past the gauge each second. Gage height is how high the water sits at the gauge (feet). They're related by a rating curve specific to each gauge — higher water means more flow, but the exact ratio depends on channel shape.
How is "percent of median" calculated?
Today's discharge is compared to the historical median discharge on this calendar day across the gauge's full record. 100% = right on median; 200% = a very high year; 30% = a drought-level low.
What are flood stages, and is this river safe right now?
Flood stages are NWS-defined gage-height thresholds — Action, Minor, Moderate, Major — marking when nearby roads or floodplains start to be affected. "Safe" depends on your activity and skill: a level that's a fun paddle for an expert can be lethal for a wader. Always check the current level against the thresholds above and the safety links, and when in doubt, stay off the water.
Can I get alerts when Lostmans River Below Second Bay rises?
Yes — flow alerts are managed in the Snoflo iOS app. Favorite this gauge, set a streamflow threshold (e.g. "alert me when discharge crosses 5,000 cfs"), and you'll get a push the moment USGS reports the crossing.
Access the free Lostmans River Below Second Bay report
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