Williamson Creek At Manchaca Flow Report
As of August 3, 2026, Williamson Creek At Manchaca is flowing at 0 cfs with a gage height of 1.90 ft. Source: USGS gauge #08158930, refreshed throughout the day.
Historical Data
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #08158930).
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.
Williamson Creek At Manchaca
The main flow providers are rainfall and runoff, with additional inputs from urbanization and irrigation. The creek is affected by several tributaries, including Bear Creek and Onion Creek, and is impounded by the Williamson Creek Dam. Seasonal trends show higher flow in the wetter months of May to October, with potential for flash flooding during heavy rain events. Interestingly, the creek has been the site of multiple restoration projects aimed at improving water quality and wildlife habitat. Overall, the Williamson Creek at Manchaca Rd streamgauge provides important information for managing water resources in the region.
Nearby streamflow levels
Cross-check Williamson Creek At Manchaca's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Williamson Creek At Manchaca Rd | 0 cfs |
| Barton Creek At Loop 360 | 0 cfs |
| Kincheon Branch At William Cannon Blvd | 0 cfs |
| W Bouldin Creek At Oltorf Rd | 0 cfs |
| Barton Creek Above Barton Spgs At Austin | 0 cfs |
| Williamson Creek At Oak Hill | 0 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Williamson Creek At Manchaca. 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 |
|---|---|
| Austin Great Hills | 0 in |
| Fischers Store | 0 in |
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 Williamson Creek At Manchaca in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Williamson Creek At Manchaca crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Williamson Creek At Manchaca
What is the Williamson Creek At Manchaca flow rate right now?
As of August 3, 2026, Williamson Creek At Manchaca is flowing at 0 cfs. The live value, gage height, and 24-hour trend are shown at the top of this page.
Is the Williamson Creek At Manchaca running high or low right now?
Check the percent of median figure on this page: above 100% means Williamson Creek At Manchaca is running higher than normal for the date, below 100% means lower. The 24-hour trend shows whether it's rising or falling.
Where does the streamflow data for Williamson Creek At Manchaca come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 08158930. 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 Williamson Creek At Manchaca 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 Williamson Creek At Manchaca report
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