N Middleton Drain (Mill Slough) At Middleton flow report
As of July 13, 2026, N Middleton Drain (Mill Slough) At Middleton is flowing at 41 cfs with a gage height of 5.37 ft. Source: USGS gauge #13210824, refreshed throughout the day.
Historical Data
N Middleton Drain (Mill Slough) At Middleton at a glance
How N Middleton Drain (Mill Slough) At Middleton is running right now, where it sits on the map, and the key gauge stats.
N Middleton Drain (Mill Slough) At Middleton is flowing at 41 cfs, with the water sitting 5.37 ft at the gage.
This is USGS gauge #13210824 in Idaho. Over the past 10 days the average has been 38 cfs, peaking at 43 cfs.
Over the next 5 days, N Middleton Drain (Mill Slough) At Middleton Id is expected to recede from today's 41 cfs, toward roughly 34 cfs by 2026-07-18 (likely range 24-48 cfs) -- about normal for the date.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Idaho 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.
N Middleton Drain (Mill Slough) At Middleton
The flow of the stream is primarily provided by agricultural drainage and stormwater runoff. There are multiple tributaries that flow into the N Middleton Drain, including the Middle Fork and Lower Willow Creek. There are no dams on the stream. Seasonal trends show that the stream's flow is highest during the spring months due to snowmelt and precipitation, and lowest during the summer months. Interestingly, the N Middleton Drain has been found to have elevated levels of nutrients, which can lead to harmful algal blooms and negatively impact aquatic life.
Nearby streamflow levels
Cross-check N Middleton Drain (Mill Slough) At Middleton's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| N Middleton Drain (Mill Slough) At Middleton Id | 41 cfs |
| South Middleton Drain At Middleton Id | 98 cfs |
| Mason Creek At Caldwell Id | 110 cfs |
| Fifteenmile Creek Nr Midland Blvd Nr Middleton | 81 cfs |
| Mason Creek Nr Caldwell Id | 46 cfs |
| W Hartley Gulch Nr Caldwell Id | 23 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near N Middleton Drain (Mill Slough) At Middleton. 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 |
|---|---|
| Emmett 2e | 0 in |
| Meridian 3.9 Se | 0 in |
| Homedale 1 Se | 0 in |
| Meridian 4.8 Sse | 0 in |
| Homedale 4.0 Wnw | 0 in |
| Boise | 14 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 N Middleton Drain (Mill Slough) At Middleton in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when N Middleton Drain (Mill Slough) At Middleton crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About N Middleton Drain (Mill Slough) At Middleton
Where does the streamflow data for N Middleton Drain (Mill Slough) At Middleton come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 13210824. 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 N Middleton Drain (Mill Slough) At Middleton 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 N Middleton Drain (Mill Slough) At Middleton report
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