St. Vrain Creek Below Longmont Flow Report
As of July 26, 2026, St. Vrain Creek Below Longmont is flowing at -999,999 cfs. Source: USGS gauge #06725450, refreshed throughout the day.
Historical Data
St. Vrain Creek Below Longmont at a glance
How St. Vrain Creek Below Longmont is running right now, where it sits on the map, and the key gauge stats.
St. Vrain Creek Below Longmont is flowing at -999,999 cfs, with the water sitting ft at the gage.
This is USGS gauge #06725450 in Colorado. Over the past 10 days the average has been -999,999 cfs, peaking at -999,999 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Colorado flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #06725450).
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.
St. Vrain Creek Below Longmont
Vrain Creek below Longmont, CO is a stream with flow provided by snowmelt and precipitation in the surrounding area. The creek runs through Boulder and Weld counties, with some tributaries contributing to its flow, including Left Hand Creek and Boulder Creek. There are also a few dams along the creek, including Button Rock Dam and Ralph Price Reservoir. Seasonal trends show the highest flow occurring during the spring and early summer months, while the lowest flow occurs in the winter. The hydrology of St. Vrain Creek is interesting due to historic flooding events, including the 2013 flood that caused significant damage to the surrounding communities.
Nearby streamflow levels
Cross-check St. Vrain Creek Below Longmont's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| St. Vrain Creek Below Longmont | — |
| St Vrain Creek Below Boulder Creek At Hwy 119 Near Longmont | 68 cfs |
| Boulder Creek At Mouth | 1 cfs |
| Left Hand Creek At Hover Road Near Longmont | 2 cfs |
| St. Vrain Creek At Mouth | 63 cfs |
| South Platte River At Fort Lupton | 115 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near St. Vrain Creek Below Longmont. 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 |
|---|---|
| Longmont 5.1 E | 0 in |
| Firestone | 0 in |
| Longmont 1.8 E | 0 in |
| Longmont 8.2 Ese | 0 in |
| Longmont 1.8 Ene | 0 in |
| Longmont 2.1 N | 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 St. Vrain Creek Below Longmont in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when St. Vrain Creek Below Longmont crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About St. Vrain Creek Below Longmont
What is the St. Vrain Creek Below Longmont flow rate right now?
As of July 26, 2026, St. Vrain Creek Below Longmont is flowing at -999,999 cfs. The live value, gage height, and 24-hour trend are shown at the top of this page.
Is the St. Vrain Creek Below Longmont running high or low right now?
Check the percent of median figure on this page: above 100% means St. Vrain Creek Below Longmont 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 St. Vrain Creek Below Longmont come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 06725450. 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 St. Vrain Creek Below Longmont 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 St. Vrain Creek Below Longmont report
Create your free account to track this river — and everything else you love on the water.
- Flow alerts — get pinged the moment this river hits your range
- Save favorites — every river, lake & snowpack in one place
- Full history & forecasts — plus the free iPhone app