Columbia Slough At Portland Flow Report
As of July 26, 2026, Columbia Slough At Portland is flowing at 535 cfs with a gage height of 3.27 ft, receding 35% over the past 24 hours. Source: USGS gauge #14211820, refreshed throughout the day.
Historical Data
Columbia Slough At Portland at a glance
How Columbia Slough At Portland is running right now, where it sits on the map, and the key gauge stats.
Columbia Slough At Portland is flowing at 535 cfs, with the water sitting 3.27 ft at the gage. Flow is down 35% since yesterday as the gauge recedes.
This is USGS gauge #14211820 in Oregon. Over the past 10 days the average has been 749 cfs, peaking at 886 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Oregon flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #14211820).
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, Columbia Slough At Portland is expected to recede from today's 535 cfs, toward roughly 415 cfs by 2026-07-24 (likely range 220-781 cfs) -- running well below the seasonal normal.
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.
Columbia Slough At Portland
The main flow providers to the Columbia Slough include Johnson Creek, Fairview Creek, and Whitaker Ponds. There are no major dams on this waterway. Seasonal trends show that the water levels are higher in the winter months due to increased rainfall, while the summer months experience lower water levels due to decreased precipitation. Interestingly, the Columbia Slough is a highly urbanized waterway, flowing through industrial and residential areas of Portland. Despite this, efforts have been made to improve water quality and restore natural habitats through community-based projects.
Nearby streamflow levels
Cross-check Columbia Slough At Portland's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Columbia Slough At Portland | 535 cfs |
| Burnt Bridge Creek Near Mouth At Vancouver | 37 cfs |
| Willamette River At Portland | 2,030 cfs |
| Fanno Creek At 56th Ave | 0 cfs |
| Johnson Creek At Milwaukie | 18 cfs |
| Tryon Creek Below Nettle Creek | 6 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Columbia Slough 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 |
|---|---|
| Hillsboro Airport Asos & Lawrs | 0 in |
| Seine Creek | 0 in |
| Saddle Mountain | 1 in |
| Calamity | 0 in |
| Headworks Portland Water Bureau | 0 in |
| Kelso-Longview Airport | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Columbia Slough At Portland.
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 Columbia Slough 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 Columbia Slough At Portland crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Columbia Slough At Portland
What is the Columbia Slough At Portland flow rate right now?
As of July 26, 2026, Columbia Slough At Portland is flowing at 535 cfs. The live value, gage height, and 24-hour trend are shown at the top of this page.
Is the Columbia Slough At Portland running high or low right now?
Check the percent of median figure on this page: above 100% means Columbia Slough At Portland 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 Columbia Slough At Portland come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 14211820. 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 Columbia Slough 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 Columbia Slough At Portland report
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