Perkiomen Creek At Graterford flow report
As of July 16, 2026, Perkiomen Creek At Graterford is flowing at 101 cfs with a gage height of 1.14 ft, rising 10% over the past 24 hours. Source: USGS gauge #01473000, refreshed throughout the day.
Historical Data
Perkiomen Creek At Graterford at a glance
How Perkiomen Creek At Graterford is running right now, where it sits on the map, and the key gauge stats.
Perkiomen Creek At Graterford is flowing at 101 cfs, with the water sitting 1.14 ft at the gage. Flow is up 10% since yesterday — a rising hydrograph.
This is USGS gauge #01473000 in Pennsylvania. Over the past 10 days the average has been 173 cfs, peaking at 341 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Pennsylvania flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #01473000).
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, Perkiomen Creek At Graterford is expected to recede from today's 101 cfs, toward roughly 87 cfs by 2026-07-20 (likely range 35-215 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.
Perkiomen Creek At Graterford
The creek's flow is influenced by precipitation and snowmelt in the surrounding area. There are no significant dams or tributaries in the immediate vicinity of the gauge. The creek experiences seasonal trends with higher flows in the spring and lower flows in the summer and fall. Interestingly, the Perkiomen Creek is one of the few waterways in Pennsylvania that flows south to north. The hydrology of the Perkiomen Creek plays an important role in the health of the surrounding ecosystem and is closely monitored by local and state agencies.
Nearby streamflow levels
Cross-check Perkiomen Creek At Graterford's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Perkiomen Creek At Graterford | 101 cfs |
| East Branch Perkiomen Creek Near Schwenksville | 38 cfs |
| French Creek Near Phoenixville | 13 cfs |
| Schuylkill River At Norristown | 585 cfs |
| Valley Creek At Pa Turnpike Br Near Valley Forge | 12 cfs |
| Schuylkill River At Pottstown | 561 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Perkiomen Creek At Graterford. 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 |
|---|---|
| Sellersville | 0 in |
| Conshohocken | 0 in |
| Glenmoore | 0 in |
| Morgantown 4.1 Nne | 0 in |
| Coatesville 1e | 0 in |
| Springtown 1 Nne | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Perkiomen Creek At Graterford.
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 Perkiomen Creek At Graterford in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Perkiomen Creek At Graterford crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Perkiomen Creek At Graterford
Where does the streamflow data for Perkiomen Creek At Graterford come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 01473000. 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 Perkiomen Creek At Graterford 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 Perkiomen Creek At Graterford report
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