Greys River Above Reservoir Near Alpine Flow Report
As of July 16, 2026, Greys River Above Reservoir Near Alpine is flowing at 442 cfs with a gage height of 1.70 ft, holding steady over the past 24 hours. Source: USGS gauge #13023000, refreshed throughout the day.
Historical Data
Greys River Above Reservoir Near Alpine at a glance
How Greys River Above Reservoir Near Alpine is running right now, where it sits on the map, and the key gauge stats.
Greys River Above Reservoir Near Alpine is flowing at 442 cfs, with the water sitting 1.70 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #13023000 in Wyoming. Over the past 10 days the average has been 469 cfs, peaking at 507 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Wyoming flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #13023000).
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.
Streamflow Forecast
Over the next 5 days, Greys River Ab Reservoir Nr Alpine Wy is expected to hold near today's 442 cfs, toward roughly 475 cfs by 2026-07-21 (likely range 331-682 cfs) -- running well below the seasonal normal.
Powered by PULSE — Snoflo’s forecast engine, trained on this gauge’s full record of storms, snowmelt, and dry spells.
| Date | Expected (p50) | Likely range (p25–p75) | vs normal | Projected stage |
|---|
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.
Greys River Above Reservoir Near Alpine
The reservoir is formed by a dam and is used for irrigation purposes. The flow in the river is typically highest in the spring due to snowmelt and lowest in the fall. One unique feature of the hydrology in this area is the potential for flash floods during thunderstorms. Additionally, the Greys River is a popular destination for fly fishing and camping, attracting many outdoor enthusiasts each year.
Nearby streamflow levels
Cross-check Greys River Above Reservoir Near Alpine's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Greys River Ab Reservoir Nr Alpine Wy | 442 cfs |
| Salt River Ab Reservoir Nr Etna Wy | 333 cfs |
| Snake River Ab Reservoir Nr Alpine Wy | 7,820 cfs |
| Snake River Nr Irwin Id | 13,900 cfs |
| Snake River Bl Flat Creek Nr Jackson Wy | 7,610 cfs |
| Flat Creek Bel Cache Creek | 170 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Greys River Above Reservoir Near Alpine. 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 |
|---|---|
| Snake River | 0 in |
| Alpine 5.9 S | 0 in |
| Star Valley Ranch 1.0 S | 0 in |
| Thayne 1.5 Se | 1 in |
| Mount Baird - Snow | 10 in |
| Bedford - Coop | 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 Greys River Above Reservoir Near Alpine in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Greys River Above Reservoir Near Alpine crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Greys River Above Reservoir Near Alpine
Where does the streamflow data for Greys River Above Reservoir Near Alpine come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 13023000. 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 Greys River Above Reservoir Near Alpine 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 Greys River Above Reservoir Near Alpine report
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