Grand River At Portland Flow Report
As of July 17, 2026, Grand River At Portland is flowing at 615 cfs with a gage height of 5.56 ft, receding 10% over the past 24 hours. Source: USGS gauge #04114000, refreshed throughout the day.
Historical Data
Grand River At Portland at a glance
How Grand River At Portland is running right now, where it sits on the map, and the key gauge stats.
Grand River At Portland is flowing at 615 cfs, with the water sitting 5.56 ft at the gage. Flow is down 10% since yesterday as the gauge recedes.
This is USGS gauge #04114000 in Michigan. Over the past 10 days the average has been 812 cfs, peaking at 902 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Michigan flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #04114000).
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, Grand River At Portland is expected to recede from today's 615 cfs, toward roughly 508 cfs by 2026-07-22 (likely range 302-854 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.
Grand River At Portland
The river's major constituents include agricultural runoff, urban stormwater runoff, and treated wastewater discharge. There are several tributaries that contribute to the flow of the Grand River, including the Red Cedar River and Maple River. The river's flow is highest in the spring due to snowmelt and precipitation, while summer and fall typically see lower flow rates. There are several dams along the Grand River, including the Portland dam, which was constructed in 1847 and has undergone several renovations. Interesting facts about the hydrology of the Grand River include its designation as a Michigan Natural River and its importance as a habitat for migratory fish species.
Nearby streamflow levels
Cross-check Grand River At Portland's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Grand River At Portland | 615 cfs |
| Looking Glass River Near Eagle | 58 cfs |
| Grand River At Ionia | 740 cfs |
| Grand River At Lansing | 293 cfs |
| Maple River At Maple Rapids | 29 cfs |
| Quaker Brook Near Nashville | 21 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Grand River At Portland. 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 |
|---|---|
| Grand Ledge | 0 in |
| Ionia 3 W | 0 in |
| Saranac 2.6 Ne | 0 in |
| Lansing Snow | 0 in |
| Lansing 4.7 Nw | 0 in |
| Capital Region Intl Arpt | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Grand River At Portland.
Boat launches
See all →
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 Grand River At Portland in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Grand River At Portland crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Grand River At Portland
Where does the streamflow data for Grand River At Portland come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 04114000. 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 Grand River At Portland 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 Grand River At Portland report
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