Snake River Above Jackson Lake At Flagg Ranch Flow Report
As of August 2, 2026, Snake River Above Jackson Lake At Flagg Ranch is flowing at 325 cfs with a gage height of 2.51 ft, holding steady over the past 24 hours. Source: USGS gauge #13010065, refreshed throughout the day.
Historical Data
Snake River Above Jackson Lake At Flagg Ranch at a glance
How Snake River Above Jackson Lake At Flagg Ranch is running right now, where it sits on the map, and the key gauge stats.
Snake River Above Jackson Lake At Flagg Ranch is flowing at 325 cfs, with the water sitting 2.51 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #13010065 in Wyoming. Over the past 10 days the average has been 380 cfs, peaking at 443 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 #13010065).
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, Snake River Ab Jackson Lake At Flagg Ranch Wy is expected to hold near today's 325 cfs, toward roughly 307 cfs by 2026-08-07 (likely range 195-481 cfs) -- drier than normal for the date.
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.
Snake River Above Jackson Lake At Flagg Ranch
The river is also impacted by several tributaries, including the Gros Ventre River and the Hoback River. The flow of the river varies seasonally, with peak flows typically occurring in the late spring and early summer due to snowmelt. There are several dams along the river that impact the flow, including the Jackson Lake Dam and the Palisades Dam. One quirky fact about the hydrology of the area is that many of the rivers and streams in the region are popular destinations for fly fishing.
Nearby streamflow levels
Cross-check Snake River Above Jackson Lake At Flagg Ranch's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Snake River Above Jackson Lake At Flagg Ranch Wy | 325 cfs |
| Snake River Near Moran Wy | 4,940 cfs |
| Pacific Creek At Moran Wy | 66 cfs |
| Buffalo Fork Above Lava Creek Near Moran Wy | 403 cfs |
| Falls River Above Yellowstone Canal Near Squirrel Id | 493 cfs |
| Falls River Near Squirrel Id | 219 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Snake River Above Jackson Lake At Flagg Ranch. 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 |
|---|---|
| Nohrsc South Entrance Ynp Snake River Station - Snotel | 0 in |
| Snake River Station | 0 in |
| Snake River Rs - Coop | 0 in |
| Nohrsc Lewis Lake Divide Snotel | 0 in |
| Lewis Lake Divide | 0 in |
| Grassy Lake | 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 Snake River Above Jackson Lake At Flagg Ranch in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Snake River Above Jackson Lake At Flagg Ranch crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Snake River Above Jackson Lake At Flagg Ranch
What is the Snake River Above Jackson Lake At Flagg Ranch flow rate right now?
As of August 2, 2026, Snake River Above Jackson Lake At Flagg Ranch is flowing at 325 cfs. The live value, gage height, and 24-hour trend are shown at the top of this page.
Is the Snake River Above Jackson Lake At Flagg Ranch running high or low right now?
Check the percent of median figure on this page: above 100% means Snake River Above Jackson Lake At Flagg Ranch 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 Snake River Above Jackson Lake At Flagg Ranch come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 13010065. 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 Snake River Above Jackson Lake At Flagg Ranch 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 Snake River Above Jackson Lake At Flagg Ranch report
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