East Branch Rock River Near Mayville Flow Report
As of July 19, 2026, East Branch Rock River Near Mayville is flowing at 43 cfs. Source: USGS gauge #05424000, refreshed throughout the day.
Historical Data
East Branch Rock River Near Mayville at a glance
How East Branch Rock River Near Mayville is running right now, where it sits on the map, and the key gauge stats.
East Branch Rock River Near Mayville is flowing at 43 cfs, with the water sitting ft at the gage.
This is USGS gauge #05424000 in Wisconsin. Over the past 10 days the average has been 43 cfs, peaking at 43 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Wisconsin flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #05424000).
Estimate flows at an ungauged site
Drainage-area ratio transfer from this gauge . Most reliable for hydrologically similar sites in the same watershed with area ratios between roughly 0.5 and 1.5.
Percentiles are flow-duration values computed from this gauge’s observed daily record as archived by Snoflo. Return periods are Weibull plotting-position estimates from observed annual maxima, provided as general reference context only. Always verify against official USGS NWIS records. Part of Snoflo for Engineering.
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.
East Branch Rock River Near Mayville
The Rock River is a part of the Mississippi River watershed, and its flow is influenced by rainfall and snowmelt. The river has several tributaries, including the Crawfish River and the Rubicon River, which can affect its flow. There are several dams along the river, including the Horicon Dam, which can also impact water levels. Seasonally, the river's flow tends to be highest in the spring due to snowmelt and lower in the summer and fall. The hydrology of the East Branch Rock River is interesting in that it has been affected by anthropogenic factors, such as agricultural runoff and urbanization.
Nearby streamflow levels
Cross-check East Branch Rock River Near Mayville's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| East Branch Rock River Near Mayville | 43 cfs |
| Rock River At Horicon | 135 cfs |
| West Branch Rock River @ State Hwy 49 Nr Waupun | 40 cfs |
| South Branch Rock River At Waupun | 6 cfs |
| Beaver Dam River At Beaver Dam | 21 cfs |
| Rock River At Watertown | 190 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near East Branch Rock River Near Mayville. Spring snowmelt is the dominant driver of streamflow in mountain basins -- a deep snowpack upstream means more runoff later in the season.
| SNOTEL station | Snowpack |
|---|---|
| Horicon Wwtp | 0 in |
| Fond Du Lac-Mid | 0 in |
| Allenton | 0 in |
| Beaver Dam 1 N | 0 in |
| Beaver Dam | 0 in |
| Fond Du Lac-Am | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of East Branch Rock River Near Mayville.
Boat launches
See all →
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 East Branch Rock River Near Mayville in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when East Branch Rock River Near Mayville crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About East Branch Rock River Near Mayville
Where does the streamflow data for East Branch Rock River Near Mayville come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 05424000. 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 East Branch Rock River Near Mayville 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 East Branch Rock River Near Mayville report
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