Green River Below Howard A Hanson Dam flow report
As of July 12, 2026, Green River Below Howard A Hanson Dam is flowing at 363 cfs with a gage height of 4.61 ft. Source: USGS gauge #12105900, refreshed throughout the day.
Historical Data
Green River Below Howard A Hanson Dam at a glance
How Green River Below Howard A Hanson Dam is running right now, where it sits on the map, and the key gauge stats.
Green River Below Howard A Hanson Dam is flowing at 363 cfs, with the water sitting 4.61 ft at the gage.
This is USGS gauge #12105900 in Washington. Over the past 10 days the average has been 353 cfs, peaking at 366 cfs.
Over the next 5 days, Green River Below Howard A Hanson Dam is expected to hold near today's 363 cfs, toward roughly 332 cfs by 2026-07-17 (likely range 251-437 cfs) -- drier than normal for the date.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Washington flow report.
Streamflow Forecast
Powered by PULSE — Snoflo’s Predictive Unified Learning & Simulation Engine, which learns from how this river has answered every past storm, snowmelt, and dry spell to forecast where it’s headed with a precision generic models can’t match.
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.
Green River Below Howard A Hanson Dam
It is fed by tributaries such as the White River and has a flow rate that is highly dependent on seasonal trends. During the summer, the flow is typically low due to reduced snowmelt and increased demand for water. However, in the winter, the flow can be high due to increased precipitation and snowmelt. The Howard A Hanson Dam plays a crucial role in regulating the water flow, with a capacity of over 240,000 acre-feet. Interestingly, the Green River is also known for its rich history in the logging industry, with logs once floated down the river to sawmills downstream.
Nearby streamflow levels
Cross-check Green River Below Howard A Hanson Dam's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Green River Below Howard A Hanson Dam | 363 cfs |
| Green River At Purification Plant Near Palmer | 245 cfs |
| Taylor Creek Near Selleck | 29 cfs |
| Boulder Creek Near Cedar Falls | 0 cfs |
| Rex River Near Cedar Falls | 11 cfs |
| Cedar River At Cedar Falls | 91 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Green River Below Howard A Hanson Dam. 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 |
|---|---|
| Lynn Lake | 0 in |
| Lynn Lake | 0 in |
| Nohrsc Cougar Mountain | 1 in |
| Cougar Mountain | 0 in |
| Nohrsc Rex River | 0 in |
| Rex River | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Green River Below Howard A Hanson Dam.
Nearby reservoirs
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Boat launches
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River runs
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Nearby fishing
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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 Green River Below Howard A Hanson Dam in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Green River Below Howard A Hanson Dam crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Green River Below Howard A Hanson Dam
Where does the streamflow data for Green River Below Howard A Hanson Dam come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 12105900. 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 Green River Below Howard A Hanson Dam 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 Green River Below Howard A Hanson Dam report
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