Flow report
Maryland River Levels & Streamflow
As of Aug 9, 2026, Maryland rivers are running at 125% of normal across 93 USGS gauges — the highest is 11,900 cfs on the Susquehanna River At Conowingo. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in Maryland.
USGS gauges
93
State percent normal
125%
Paddle runs
0
Updated
Aug 9
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Every USGS streamgauge filtered to Maryland.
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August
9
2026
Flow briefing
Streamflow levels across Maryland are currently 125% of normal, with the Susquehanna River At Conowingo reporting the highest discharge in the state at 11,900 cfs and a gauge stage of 10.67 ft.
Meanwhile, the Big Elk Creek At Elk Mills is seeing a spike today — up 610% since yesterday and currently running near peak.
Tap any gauge below for the full hydrograph, paired weather forecast, and historical context. Use the rivers panel to jump into Maryland's named rivers.
River levels near Maryland towns
Active weather warnings for Maryland
# Maryland Storm Center Report
Maryland residents should remain alert for potential severe weather this weekend. A test monitoring message is currently active through August 9, 2026. Meteorologists are tracking storm systems that could produce flash flooding Saturday afternoon across the state. Severe thunderstorm and tornado warnings remain in effect for portions of Maryland, with residents in Baltimore, Annapolis, and surrounding communities urged to stay weather-aware. Prepare emergency supplies, monitor local weather alerts closely, and avoid driving through flooded areas. Recent updates to thunderstorm and tornado warning protocols aim to improve alert accuracy and response times.
Maryland residents should remain alert for potential severe weather this weekend. A test monitoring message is currently active through August 9, 2026. Meteorologists are tracking storm systems that could produce flash flooding Saturday afternoon across the state. Severe thunderstorm and tornado warnings remain in effect for portions of Maryland, with residents in Baltimore, Annapolis, and surrounding communities urged to stay weather-aware. Prepare emergency supplies, monitor local weather alerts closely, and avoid driving through flooded areas. Recent updates to thunderstorm and tornado warning protocols aim to improve alert accuracy and response times.
Maryland at a glance
State-wide streamflow overview
The Maryland flow picture in four data points -- where the state sits versus historical norms, what's flowing hardest, and what's spiking fastest.
Percent of normal
125%
100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.
Highest discharge
Susquehanna River At Conowingo
11,900 cfs
Gauge stage 10.67 ft
Biggest 24h spike
Big Elk Creek At Elk Mills
+610%
Now 350 cfs
Network coverage
Gauges + rivers tracked
93 + 0
USGS gauges feeding 0 named rivers in Maryland.
Full streamgauge inventory
Maryland USGS streamgauges
Every USGS gauge Snoflo tracks in Maryland. Sortable, quickly filterable. Numeric columns heat-mapped from light to deep. Tap any gauge for its full hydrograph and forecast.
| Streamgage | Streamflow | Gage height | Water temp | Air temp | Elevation | Watershed |
|---|---|---|---|---|---|---|
|
Susquehanna River At Conowingo, Md
6 hours ago · USGS 01578310 |
5,940 cfs | 9.50 ft | · | 71°F | 21 ft | Lower Susquehanna |
|
Potomac River At Point Of Rocks, Md
7 hours ago · USGS 01638500 |
2,780 cfs | 1.56 ft | 85°F | 72°F | 192 ft | Middle Potomac-Catoctin |
|
Potomac River Near Wash, Md
7 hours ago · USGS 01646500 |
2,070 cfs | 2.84 ft | 45°F | 75°F | 43 ft | Middle Potomac-Catoctin |
|
Potomac River At Hancock, Md
6 hours ago · USGS 01613000 |
954 cfs | 3.24 ft | · | 72°F | 396 ft | Conococheague-Opequon |
|
Potomac River At Paw Paw, Md
6 hours ago · USGS 01610000 |
666 cfs | 3.84 ft | · | 71°F | 501 ft | Cacapon-Town |
|
North Branch Potomac River Near Cumberland, Md
6 hours ago · USGS 01603000 |
420 cfs | 2.58 ft | · | 71°F | 589 ft | North Branch Potomac |
|
Youghiogheny River At Friendsville, Md
7 hours ago · USGS 03076500 |
276 cfs | 2.68 ft | 71°F | 68°F | 1,555 ft | Youghiogheny |
|
Monocacy River At Jug Bridge Near Frederick, Md
6 hours ago · USGS 01643000 |
246 cfs | 1.91 ft | · | 72°F | 231 ft | Monocacy |
|
Conococheague Creek At Fairview, Md
7 hours ago · USGS 01614500 |
234 cfs | 1.93 ft | · | 71°F | 438 ft | Conococheague-Opequon |
|
Patuxent River Near Bowie, Md
6 hours ago · USGS 01594440 |
217 cfs | 4.89 ft | · | 74°F | 20 ft | Patuxent |
|
Monocacy River At Monocacy Blvd At Frederick, Md
6 hours ago · USGS 01642190 |
178 cfs | 1.92 ft | · | 72°F | 259 ft | Monocacy |
|
Antietam Creek Near Sharpsburg, Md
6 hours ago · USGS 01619500 |
174 cfs | 2.61 ft | · | 71°F | 367 ft | Conococheague-Opequon |
|
Gunpowder Falls At Glencoe, Md
6 hours ago · USGS 01582500 |
172 cfs | 1.50 ft | · | 71°F | 247 ft | Gunpowder-Patapsco |
|
Big Elk Creek At Elk Mills, Md
7 hours ago · USGS 01495000 |
169 cfs | 4.09 ft | · | 72°F | 70 ft | Chester-Sassafras |
|
North Branch Potomac River At Kitzmiller, Md
6 hours ago · USGS 01595500 |
162 cfs | 2.42 ft | · | 69°F | 1,575 ft | North Branch Potomac |
|
Youghiogheny River Near Oakland, Md
6 hours ago · USGS 03075500 |
140 cfs | 2.48 ft | · | 65°F | 2,370 ft | Youghiogheny |
|
Gunpowder Falls Near Parkton, Md
7 hours ago · USGS 01581920 |
133 cfs | 2.09 ft | 58°F | 71°F | 352 ft | Gunpowder-Patapsco |
|
Deer Creek Near Darlington, Md
6 hours ago · USGS 01580520 |
132 cfs | 1.59 ft | · | 71°F | 49 ft | Lower Susquehanna |
|
North Branch Potomac River At Steyer, Md
6 hours ago · USGS 01595000 |
95 cfs | 2.53 ft | · | 65°F | 2,276 ft | North Branch Potomac |
|
Gwynns Falls At Washington Blvd At Baltimore, Md
6 hours ago · USGS 01589352 |
75 cfs | 2.85 ft | · | 75°F | 18 ft | Gunpowder-Patapsco |
|
Seneca Creek At Dawsonville, Md
7 hours ago · USGS 01645000 |
70 cfs | 2.07 ft | · | 72°F | 216 ft | Middle Potomac-Catoctin |
|
Patapsco River At Hollofield, Md
6 hours ago · USGS 01589000 |
69 cfs | 1.58 ft | · | 72°F | 190 ft | Gunpowder-Patapsco |
|
Antietam Creek Near Waynesboro, Md
7 hours ago · USGS 01619000 |
61 cfs | 2.40 ft | · | 71°F | 547 ft | Conococheague-Opequon |
|
Savage Riv Bl Savage Riv Dam Near Bloomington, Md
6 hours ago · USGS 01597500 |
60 cfs | · | 56°F | 68°F | 1,382 ft | North Branch Potomac |
|
Little Patuxent River At Savage, Md
6 hours ago · USGS 01594000 |
57 cfs | 3.28 ft | · | 73°F | 126 ft | Patuxent |
|
Monocacy River At Bridgeport, Md
6 hours ago · USGS 01639000 |
55 cfs | 2.84 ft | · | 71°F | 332 ft | Monocacy |
|
Deer Creek At Rocks, Md
6 hours ago · USGS 01580000 |
55 cfs | 2.12 ft | · | 71°F | 262 ft | Lower Susquehanna |
|
Wills Creek Near Cumberland, Md
7 hours ago · USGS 01601500 |
50 cfs | 1.96 ft | · | 70°F | 703 ft | North Branch Potomac |
|
Little Patuxent River At Guilford, Md
7 hours ago · USGS 01593500 |
33 cfs | 2.37 ft | · | 73°F | 267 ft | Patuxent |
|
Gwynns Falls At Villa Nova, Md
6 hours ago · USGS 01589300 |
33 cfs | 1.09 ft | · | 72°F | 367 ft | Gunpowder-Patapsco |
|
Western Run At Western Run, Md
6 hours ago · USGS 01583500 |
28 cfs | · | · | 72°F | 265 ft | Gunpowder-Patapsco |
|
Winters Run Near Benson, Md
6 hours ago · USGS 01581700 |
28 cfs | 1.40 ft | · | 72°F | 190 ft | Gunpowder-Patapsco |
|
North Branch Patapsco River At Cedarhurst, Md
7 hours ago · USGS 01586000 |
28 cfs | 1.42 ft | · | 71°F | 423 ft | Gunpowder-Patapsco |
|
Western Branch At Upper Marlboro, Md
6 hours ago · USGS 01594526 |
26 cfs | 1.85 ft | · | 74°F | 9 ft | Patuxent |
|
Little Falls At Blue Mount, Md
6 hours ago · USGS 01582000 |
26 cfs | · | · | 70°F | 306 ft | Gunpowder-Patapsco |
|
Bennett Creek At Park Mills, Md
6 hours ago · USGS 01643500 |
26 cfs | 1.59 ft | · | 72°F | 304 ft | Monocacy |
|
Tuckahoe Creek Near Ruthsburg, Md
7 hours ago · USGS 01491500 |
25 cfs | · | · | 74°F | 14 ft | Choptank |
|
Casselman River At Grantsville, Md
6 hours ago · USGS 03078000 |
23 cfs | · | · | 66°F | 2,135 ft | Youghiogheny |
|
Patuxent River Below Brighton Dam Near Brighton, Md
7 hours ago · USGS 01591610 |
21 cfs | 1.40 ft | 70°F | 72°F | 310 ft | Patuxent |
|
Patuxent Riv Near Laurel, Md
6 hours ago · USGS 01592500 |
19 cfs | 4.32 ft | · | 73°F | 160 ft | Patuxent |
|
North East Branch Anacostia River At Riverdale, Md
6 hours ago · USGS 01649500 |
19 cfs | · | 79°F | 74°F | 14 ft | Middle Potomac-Anacostia-Occoquan |
|
Bear Creek At Friendsville, Md
6 hours ago · USGS 03076600 |
18 cfs | 1.19 ft | · | 68°F | 1,640 ft | Youghiogheny |
|
Zekiah Swamp Run Near Newtown, Md
6 hours ago · USGS 01660920 |
18 cfs | 1.01 ft | · | 73°F | 37 ft | Lower Potomac |
|
Little Gunpowder Falls At Laurel Brook, Md
6 hours ago · USGS 01584500 |
17 cfs | 1.08 ft | · | 72°F | 260 ft | Gunpowder-Patapsco |
|
Jones Falls At Sorrento, Md
6 hours ago · USGS 01589440 |
15 cfs | 7.87 ft | · | 73°F | 236 ft | Gunpowder-Patapsco |
|
Big Pipe Creek At Bruceville, Md
7 hours ago · USGS 01639500 |
14 cfs | · | · | 71°F | 370 ft | Monocacy |
|
Georges Creek At Franklin, Md
7 hours ago · USGS 01599000 |
14 cfs | 1.95 ft | · | 69°F | 975 ft | North Branch Potomac |
|
Patuxent River Near Unity, Md
7 hours ago · USGS 01591000 |
13 cfs | 2.00 ft | · | 71°F | 383 ft | Patuxent |
|
Catoctin Creek Near Middletown, Md
7 hours ago · USGS 01637500 |
13 cfs | 1.62 ft | · | 71°F | 436 ft | Middle Potomac-Catoctin |
|
Beaverdam Run At Cockeysville, Md
6 hours ago · USGS 01583600 |
12 cfs | 2.23 ft | · | 72°F | 245 ft | Gunpowder-Patapsco |
|
Hawlings River Near Sandy Spring, Md
7 hours ago · USGS 01591700 |
12 cfs | · | · | 73°F | 307 ft | Patuxent |
|
Morgan Run Near Louisville, Md
7 hours ago · USGS 01586610 |
11 cfs | 1.43 ft | · | 71°F | 430 ft | Gunpowder-Patapsco |
|
Cattail Creek Near Glenwood, Md
7 hours ago · USGS 01591400 |
11 cfs | · | · | 71°F | 382 ft | Patuxent |
|
Choptank River Near Greensboro, Md
6 hours ago · USGS 01491000 |
10 cfs | 1.99 ft | 82°F | 73°F | 5 ft | Choptank |
|
Town Creek Near Oldtown, Md
6 hours ago · USGS 01609000 |
9 cfs | 1.84 ft | · | 70°F | 567 ft | Cacapon-Town |
|
Gunpowder Falls At Hoffmanville, Md
6 hours ago · USGS 01581810 |
9 cfs | 1.08 ft | · | 70°F | 550 ft | Gunpowder-Patapsco |
|
Mattawoman Creek Near Pomonkey, Md
7 hours ago · USGS 01658000 |
9 cfs | 2.23 ft | 73°F | 73°F | 46 ft | Lower Potomac |
|
Unicorn Branch Near Millington, Md
7 hours ago · USGS 01493000 |
9 cfs | 1.39 ft | · | 73°F | 8 ft | Chester-Sassafras |
|
Bynum Run At Bel Air, Md
6 hours ago · USGS 01581500 |
8 cfs | · | · | 72°F | 260 ft | Gunpowder-Patapsco |
|
Marsh Run At Grimes, Md
6 hours ago · USGS 01617800 |
8 cfs | 1.12 ft | · | 70°F | 405 ft | Conococheague-Opequon |
|
Piscataway Creek At Piscataway, Md
6 hours ago · USGS 01653600 |
6 cfs | 2.43 ft | · | 74°F | 16 ft | Middle Potomac-Anacostia-Occoquan |
|
Savage River Near Barton, Md
6 hours ago · USGS 01596500 |
6 cfs | · | 70°F | 67°F | 1,659 ft | North Branch Potomac |
|
Nw Branch Anacostia River Near Colesville, Md
7 hours ago · USGS 01650500 |
6 cfs | 1.52 ft | · | 73°F | 271 ft | Middle Potomac-Anacostia-Occoquan |
|
Pocomoke River Near Willards, Md
7 hours ago · USGS 01485000 |
6 cfs | 4.52 ft | · | 77°F | 22 ft | Pocomoke |
|
Georges Run Near Beckleysville, Md
6 hours ago · USGS 01581870 |
5 cfs | · | · | 71°F | 521 ft | Gunpowder-Patapsco |
|
Beaver Run Near Finksburg, Md
7 hours ago · USGS 01586210 |
5 cfs | · | · | 72°F | 431 ft | Gunpowder-Patapsco |
|
Beetree Run At Bentley Springs, Md
6 hours ago · USGS 01581960 |
5 cfs | · | · | 71°F | 491 ft | Gunpowder-Patapsco |
|
Piney Run At Dover, Md
6 hours ago · USGS 01583100 |
5 cfs | 1.45 ft | · | 71°F | 380 ft | Gunpowder-Patapsco |
|
Sawmill Creek At Glen Burnie, Md
7 hours ago · USGS 01589500 |
5 cfs | 1.96 ft | · | 74°F | 34 ft | Gunpowder-Patapsco |
|
Plumtree Run Near Bel Air, Md
6 hours ago · USGS 01581752 |
5 cfs | 1.27 ft | 75°F | 72°F | 187 ft | Gunpowder-Patapsco |
|
Morgan Creek Near Kennedyville, Md
7 hours ago · USGS 01493500 |
4 cfs | 1.29 ft | · | 73°F | 4 ft | Chester-Sassafras |
|
St Marys River At Great Mills, Md
6 hours ago · USGS 01661500 |
4 cfs | 1.38 ft | · | 76°F | 13 ft | Lower Potomac |
|
Long Green Creek At Glen Arm, Md
6 hours ago · USGS 01584050 |
4 cfs | 1.02 ft | · | 72°F | 290 ft | Gunpowder-Patapsco |
|
Nassawango Creek Near Snow Hill, Md
6 hours ago · USGS 01485500 |
4 cfs | 1.52 ft | · | 78°F | 21 ft | Pocomoke |
|
Chicamacomico River Near Salem, Md
6 hours ago · USGS 01490000 |
4 cfs | · | · | 76°F | 2 ft | Blackwater-Wicomico |
|
Gwynns Falls Near Delight, Md
7 hours ago · USGS 01589197 |
3 cfs | · | · | 72°F | 536 ft | Gunpowder-Patapsco |
|
Chesterville Branch Near Crumpton, Md
7 days ago · USGS 01493112 |
3 cfs | 1.42 ft | 51°F | 73°F | 10 ft | Chester-Sassafras |
|
Honeygo Run Near White Marsh, Md
7 hours ago · USGS 01585104 |
3 cfs | · | · | 74°F | 25 ft | Gunpowder-Patapsco |
|
Grave Run Near Beckleysville, Md
7 hours ago · USGS 01581830 |
3 cfs | · | · | 71°F | 560 ft | Gunpowder-Patapsco |
|
Whitemarsh Run Near Fullerton, Md
7 hours ago · USGS 01585090 |
3 cfs | 1.21 ft | · | 74°F | 138 ft | Gunpowder-Patapsco |
|
St Clement Creek Near Clements, Md
6 hours ago · USGS 01661050 |
2 cfs | · | · | 74°F | 11 ft | Lower Potomac |
|
Sallie Harris Creek Near Carmichael, Md
7 hours ago · USGS 01492500 |
2 cfs | · | · | 75°F | 14 ft | Chester-Sassafras |
|
Dead Run At Franklintown, Md
6 hours ago · USGS 01589330 |
2 cfs | · | · | 73°F | 313 ft | Gunpowder-Patapsco |
|
Sideling Hill Creek Near Bellegrove, Md
7 hours ago · USGS 01610155 |
2 cfs | · | · | 71°F | 482 ft | Cacapon-Town |
|
Whitemarsh Run At White Marsh, Md
6 hours ago · USGS 01585100 |
1 cfs | 3.21 ft | · | 74°F | 42 ft | Gunpowder-Patapsco |
|
Manokin Branch Near Princess Anne, Md
6 hours ago · USGS 01486000 |
1 cfs | 1.54 ft | · | 78°F | 14 ft | Pocomoke |
|
East Branch Herbert Run At Arbutus, Md
6 hours ago · USGS 01589100 |
1 cfs | · | · | 74°F | 49 ft | Gunpowder-Patapsco |
|
West Branch Herring Run At Idlewylde, Md
7 hours ago · USGS 01585200 |
1 cfs | · | · | 73°F | 286 ft | Gunpowder-Patapsco |
|
Birch Branch At Showell, Md
7 hours ago · USGS 0148471320 |
1 cfs | 3.11 ft | · | 77°F | 6 ft | Chincoteague |
|
Baisman Run At Broadmoor, Md
6 hours ago · USGS 01583580 |
0 cfs | 1.12 ft | · | 73°F | 333 ft | Gunpowder-Patapsco |
|
Cranberry Branch Near Westminster, Md
6 hours ago · USGS 01585500 |
0 cfs | 1.21 ft | · | 71°F | 672 ft | Gunpowder-Patapsco |
|
Minebank Run Near Glen Arm, Md
6 hours ago · USGS 0158397967 |
0 cfs | 4.10 ft | · | 72°F | 225 ft | Gunpowder-Patapsco |
|
South Fork Jabez Branch At Millersville, Md
7 hours ago · USGS 01589795 |
0 cfs | 3.19 ft | · | 74°F | 60 ft | Severn |
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Flow report FAQ
About Maryland streamflow
What are river levels like in Maryland right now?
As of August 9, 2026, Maryland rivers are running at 125% of normal across 93 USGS streamgauges, and the Susquehanna River At Conowingo is reporting the highest discharge at 11,900 cfs. The full sortable gauge table is below.
Which Maryland river is running highest right now?
As of August 9, 2026, the highest discharge in Maryland is 11,900 cfs on the Susquehanna River At Conowingo. See the sortable gauge table for the full statewide ranking.
Are Maryland rivers high or low right now?
Compare the statewide percent-of-normal on this page: above 100% means Maryland rivers are running higher than the seasonal average for the date, below 100% means lower (a dry spell or drought). Each gauge also shows its own percent of median.
Where does the Maryland streamflow data come from?
The U.S. Geological Survey National Water Information System. USGS streamgauges report continuously (every 15 minutes) and the data is the canonical real-time record for U.S. rivers. Snoflo pulls the latest readings and joins them to a 7-day NOAA weather forecast for each station.
What is cfs?
Cubic feet per second — the standard unit for streamflow. One cfs is about 7.5 gallons per second. Small creeks run at single-digit cfs; the Mississippi at hundreds of thousands.
What does Gauge Height mean?
The water level at the gauge in feet above the reference datum. Used together with discharge to track river state. Flood stage and runnable levels are typically expressed in gauge height (e.g., "flood at 16 ft").
How fresh is the Maryland data?
USGS streamgauges report every 15 minutes; Snoflo re-pulls throughout the day. The AI briefing regenerates daily.
Can I get a flow alert for a Maryland gauge?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a discharge or stage threshold (e.g. "alert me when discharge crosses 2,000 cfs"), and you'll get a push the moment it crosses.
Is this a substitute for an NWS flood warning?
No. Snoflo is informational. For flood life-safety decisions always follow guidance from your local NWS forecast office and state emergency management. Snoflo data is one input among several.
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