Casselman River river
Total streamflow across the Casselman River was last observed at 5,270 cfs, and is expected to yield approximately 10,453 acre-ft of water today; about 516% of normal. River levels are high. Average streamflow for this time of year is 1,020 cfs, with recent peaks last observed on 2025-05-14 when daily discharge volume was observed at 29,280 cfs.
Maximum discharge along the river is currently at the Casselman River At Markleton reporting a streamflow rate of 3,900 cfs. This is also the highest stage along the Casselman River, with a gauge stage of 5 ft at this location. This river is monitored from 2 different streamgauging stations along the Casselman River, the highest being situated at an altitude of 2,135 ft, the Casselman River At Grantsville.
River streamflow levels
Daily aggregate streamflow across every monitored gauge along the Casselman River. Use the range buttons to zoom in on a specific period.
Total streamflow
Sum of all monitored streamgauges · daily
Every streamgauge along the Casselman River
All 2 USGS gauges Snoflo tracks for this river, with current flow, stage, recent change, percent of normal, and the gauge's all-time min / max. Click any header to sort. Cells are heatmapped relative to the column min/max -- darker blue = higher.
| Streamgauge▾ | Streamflow (cfs)▾ | Gauge stage (ft)▾ | 24h Δ (%)▾ | % Normal▾ | Min (cfs)▾ | Max (cfs)▾ | Elevation (ft)▾ |
|---|---|---|---|---|---|---|---|
|
Casselman River At Grantsville
MD
USGS 03078000
|
1,370 | 3.85 | 298.3 | 1473% | 2 | 2,710 | 2,135 |
|
Casselman River At Markleton
PA
USGS 03079000
|
3,900 | 5.00 | 47.7 | 775% | 24 | 27,700 | 1,656 |
Maximum streamflow discharge by year
The single highest aggregate discharge recorded each year. Spotting the multi-year trend reveals droughts vs. wet cycles long before the headline daily flow does.
Annual peak discharge
From the river's full record · one point per water year
Streamflow elevation profile
Each bubble is one gauge along the river, plotted by current streamflow (x-axis) vs elevation (y-axis), sized by gauge stage. Reading top-to-bottom traces the river from headwaters down to its mouth -- you can see flow accumulate as elevation drops.
Elevation vs streamflow
One point per monitored gauge · bubble size = gauge stage
Casselman River
The Casselman River is a 56-mile long tributary of the Youghiogheny River located in western Maryland. The river was historically used for transportation and logging in the 1800s. Today, it is popular for fishing, kayaking, and other recreational activities. The river is fed by several tributaries and is home to several species of fish, including trout and smallmouth bass. The Deep Creek Dam on the river creates the Deep Creek Lake reservoir, which provides drinking water to the region and is a popular recreational area for boating and fishing. The Youghiogheny Reservoir, created by the Savage River Dam, also feeds into the Casselman River. The river is also used for agricultural purposes, with farms located along its banks. The Casselman River is an important natural resource for the region and its communities.
Recreation along the Casselman River
Fishing access and paddle runs Snoflo tracks within the watershed.
Track the Casselman River in the Snoflo app
Set per-gauge push alerts (e.g. "alert me when flow at the Russian R Nr Healdsburg crosses 5,000 cfs"), and Snoflo's iOS app pushes the moment USGS reports the crossing.
About the Casselman River
Where does the data for the Casselman River come from?
Streamflow and gauge stage data are sourced from the U.S. Geological Survey (USGS) National Water Information System. The aggregate flow shown at the top of the page is computed by Snoflo as the sum of all monitored gauges along the river.
How is "percent of normal" calculated?
Today's aggregate streamflow is compared to the historical average aggregate streamflow on this calendar day across the river's full record. 100% means right on average; values above 100% indicate above-normal flow (wet year); values below indicate below-normal (dry year or drought).
Why are some gauges showing very different flows?
Gauges along a river measure flow at different points: headwater gauges read what's coming off the snowpack or mountain runoff; downstream gauges integrate everything upstream, including tributary inputs. Wide spreads usually mean a tributary is contributing significantly between gauges.
What's the elevation profile chart showing?
Each bubble is one gauge along the river, plotted by streamflow (x-axis) and elevation (y-axis), sized by gauge stage. Reading top-down traces the river from headwaters to mouth -- you can see flow build as elevation drops.
Can I get alerts when a specific gauge crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app on a per-gauge basis. Open any individual streamgauge from the table above and favorite it to set a discharge threshold.