Grays Lake Outlet Near Herman Flow Report
As of July 21, 2026, Grays Lake Outlet Near Herman is flowing at 0 cfs with a gage height of 1.85 ft. Source: USGS gauge #13057500, refreshed throughout the day.
Historical Data
Grays Lake Outlet Near Herman at a glance
How Grays Lake Outlet Near Herman is running right now, where it sits on the map, and the key gauge stats.
Grays Lake Outlet Near Herman is flowing at 0 cfs, with the water sitting 1.85 ft at the gage.
This is USGS gauge #13057500 in Idaho. Over the past 10 days the average has been 0 cfs, peaking at 0 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Idaho flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #13057500).
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.
Grays Lake Outlet Near Herman
The outlet flows into Bear River, which eventually joins the Great Salt Lake. There are no dams along this stretch of the river. The flow is typically highest in May and June due to snowmelt, and lowest in the fall and winter. Interestingly, the outlet is known for its high concentration of cutthroat trout, which attract anglers and wildlife enthusiasts. The unique hydrology of the area also supports a diverse range of vegetation, including sagebrush, aspen, and willows.
Nearby streamflow levels
Cross-check Grays Lake Outlet Near Herman's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Grays Lake Outlet Nr Herman Id | 0 cfs |
| Grays Lk Div To Blackfoot R Basin Nr Wayan Id | 0 cfs |
| Snake River Nr Irwin Id | 13,700 cfs |
| Blackfoot River Ab Reservoir Nr Henry Id | 24 cfs |
| Salt River Ab Reservoir Nr Etna Wy | 322 cfs |
| Willow Creek Bl Tex Creek Nr Ririe Id | 10 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Grays Lake Outlet Near Herman. 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 Sheep Mountain Snotel | 0 in |
| Sheep Mtn. | 0 in |
| Somsen Ranch | 0 in |
| Nohrsc Somsen Ranch | 0 in |
| Swan Valley | 0 in |
| Alpine 5.9 S | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Grays Lake Outlet Near Herman.
Boat launches
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River runs
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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 Grays Lake Outlet Near Herman in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Grays Lake Outlet Near Herman crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Grays Lake Outlet Near Herman
Where does the streamflow data for Grays Lake Outlet Near Herman come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 13057500. 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 Grays Lake Outlet Near Herman 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 Grays Lake Outlet Near Herman 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
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