St. John River At Ninemile Bridge Flow Report
As of August 4, 2026, St. John River At Ninemile Bridge is flowing at 834 cfs with a gage height of 1.80 ft, rising 112% over the past 24 hours. Source: USGS gauge #01010000, refreshed throughout the day.
Historical Data
St. John River At Ninemile Bridge at a glance
How St. John River At Ninemile Bridge is running right now, where it sits on the map, and the key gauge stats.
St. John River At Ninemile Bridge is flowing at 834 cfs, with the water sitting 1.80 ft at the gage. Flow is up 112% since yesterday — a rising hydrograph.
This is USGS gauge #01010000 in Maine. Over the past 10 days the average has been 262 cfs, peaking at 834 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Maine flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #01010000).
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, St. John River At Ninemile Bridge is expected to recede from today's 834 cfs, toward roughly 600 cfs by 2026-08-09 (likely range 195-1847 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.
St. John River At Ninemile Bridge
John River at Ninemile Bridge, ME stream gauge is characterized by a flow that is primarily supplied by snowmelt and precipitation. The river is fed by several tributaries, including the Fish River and the Allagash River, and is subject to seasonal fluctuations, with higher flows occurring in the spring and lower flows in the summer and fall. There are several dams along the river that impact flow, including the Grand Falls Dam and the Fort Kent Dam. The hydrology of the river is unique in that it is part of both the Atlantic and Gulf of St. Lawrence watersheds. Interesting fact: The St. John River is one of the few rivers in the world that flows northward.
Nearby streamflow levels
Cross-check St. John River At Ninemile Bridge's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| St. John River At Ninemile Bridge | 834 cfs |
| Big Black River Near Depot Mountain | 221 cfs |
| Allagash River Near Allagash | 607 cfs |
| St. John River At Dickey | 1,230 cfs |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of St. John River At Ninemile Bridge.
Boat launches
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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 St. John River At Ninemile Bridge in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when St. John River At Ninemile Bridge crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About St. John River At Ninemile Bridge
What is the St. John River At Ninemile Bridge flow rate right now?
As of August 4, 2026, St. John River At Ninemile Bridge is flowing at 834 cfs. The live value, gage height, and 24-hour trend are shown at the top of this page.
Is the St. John River At Ninemile Bridge running high or low right now?
Check the percent of median figure on this page: above 100% means St. John River At Ninemile Bridge 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 St. John River At Ninemile Bridge come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 01010000. 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 St. John River At Ninemile Bridge 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 St. John River At Ninemile Bridge report
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