Flow report
Maryland streamflow
Live discharge, gauge height, water temperature, and percent-of-normal readings from every USGS streamgauge in Maryland. Built for paddlers, anglers, water managers, and flood researchers.
USGS gauges
93
State percent normal
84%
Paddle runs
0
Updated
Jul 20
Open the Maryland flow layer on the map
Every USGS streamgauge filtered to Maryland.
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July
20
2026
Flow briefing
Streamflow levels across Maryland are currently 84% of normal, with the Susquehanna River At Conowingo reporting the highest discharge in the state at 5,860 cfs and a gauge stage of 9.48 ft.
Meanwhile, the Susquehanna River At Conowingo is seeing a spike today — up 1% 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
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
84%
100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.
Highest discharge
Susquehanna River At Conowingo
5,860 cfs
Gauge stage 9.48 ft
Biggest 24h spike
Susquehanna River At Conowingo
+1%
Now 5,860 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
1 day ago · USGS 01578310 |
5,900 cfs | 9.49 ft | · | 70°F | 21 ft | Lower Susquehanna |
|
Potomac River At Point Of Rocks, Md
1 day ago · USGS 01638500 |
2,880 cfs | 1.60 ft | 79°F | 72°F | 192 ft | Middle Potomac-Catoctin |
|
Potomac River Near Wash, Md
1 day ago · USGS 01646500 |
2,850 cfs | 3.00 ft | 45°F | 74°F | 43 ft | Middle Potomac-Catoctin |
|
Potomac River At Hancock, Md
1 day ago · USGS 01613000 |
983 cfs | 3.27 ft | · | 69°F | 396 ft | Conococheague-Opequon |
|
Potomac River At Paw Paw, Md
1 day ago · USGS 01610000 |
856 cfs | 4.14 ft | · | 70°F | 501 ft | Cacapon-Town |
|
Youghiogheny River At Friendsville, Md
1 day ago · USGS 03076500 |
557 cfs | 3.15 ft | 72°F | 66°F | 1,555 ft | Youghiogheny |
|
North Branch Potomac River Near Cumberland, Md
1 day ago · USGS 01603000 |
452 cfs | 2.62 ft | · | 69°F | 589 ft | North Branch Potomac |
|
Youghiogheny River Near Oakland, Md
1 day ago · USGS 03075500 |
372 cfs | 3.06 ft | · | 63°F | 2,370 ft | Youghiogheny |
|
Monocacy River At Jug Bridge Near Frederick, Md
1 day ago · USGS 01643000 |
330 cfs | 2.16 ft | · | 72°F | 231 ft | Monocacy |
|
Gunpowder Falls At Glencoe, Md
1 day ago · USGS 01582500 |
188 cfs | 1.58 ft | · | 71°F | 247 ft | Gunpowder-Patapsco |
|
Monocacy River At Monocacy Blvd At Frederick, Md
1 day ago · USGS 01642190 |
181 cfs | 1.93 ft | · | 72°F | 259 ft | Monocacy |
|
Gunpowder Falls Near Parkton, Md
1 day ago · USGS 01581920 |
163 cfs | 2.21 ft | 63°F | 70°F | 352 ft | Gunpowder-Patapsco |
|
Little Patuxent River At Savage, Md
1 day ago · USGS 01594000 |
156 cfs | 3.90 ft | · | 73°F | 126 ft | Patuxent |
|
Seneca Creek At Dawsonville, Md
1 day ago · USGS 01645000 |
146 cfs | 2.41 ft | · | 72°F | 216 ft | Middle Potomac-Catoctin |
|
Western Branch At Upper Marlboro, Md
1 day ago · USGS 01594526 |
126 cfs | 3.07 ft | · | 74°F | 9 ft | Patuxent |
|
Patuxent River Near Bowie, Md
1 day ago · USGS 01594440 |
117 cfs | 4.20 ft | · | 74°F | 20 ft | Patuxent |
|
Antietam Creek Near Sharpsburg, Md
1 day ago · USGS 01619500 |
117 cfs | 2.38 ft | · | 71°F | 367 ft | Conococheague-Opequon |
|
Conococheague Creek At Fairview, Md
1 day ago · USGS 01614500 |
111 cfs | 1.44 ft | · | 70°F | 438 ft | Conococheague-Opequon |
|
Casselman River At Grantsville, Md
1 day ago · USGS 03078000 |
97 cfs | 1.41 ft | · | 64°F | 2,135 ft | Youghiogheny |
|
North Branch Potomac River At Kitzmiller, Md
1 day ago · USGS 01595500 |
86 cfs | 2.08 ft | · | 66°F | 1,575 ft | North Branch Potomac |
|
Bear Creek At Friendsville, Md
1 day ago · USGS 03076600 |
84 cfs | 2.11 ft | · | 66°F | 1,640 ft | Youghiogheny |
|
Bennett Creek At Park Mills, Md
1 day ago · USGS 01643500 |
78 cfs | 1.92 ft | · | 72°F | 304 ft | Monocacy |
|
North Branch Potomac River At Steyer, Md
1 day ago · USGS 01595000 |
76 cfs | 2.44 ft | · | 64°F | 2,276 ft | North Branch Potomac |
|
Little Patuxent River At Guilford, Md
1 day ago · USGS 01593500 |
72 cfs | 2.91 ft | · | 72°F | 267 ft | Patuxent |
|
Gwynns Falls At Washington Blvd At Baltimore, Md
1 day ago · USGS 01589352 |
64 cfs | 2.77 ft | · | 74°F | 18 ft | Gunpowder-Patapsco |
|
Patapsco River At Hollofield, Md
1 day ago · USGS 01589000 |
63 cfs | 1.53 ft | · | 71°F | 190 ft | Gunpowder-Patapsco |
|
Savage Riv Bl Savage Riv Dam Near Bloomington, Md
1 day ago · USGS 01597500 |
61 cfs | · | 56°F | 67°F | 1,382 ft | North Branch Potomac |
|
Deer Creek Near Darlington, Md
1 day ago · USGS 01580520 |
55 cfs | 1.03 ft | · | 69°F | 49 ft | Lower Susquehanna |
|
Patuxent River Below Brighton Dam Near Brighton, Md
1 day ago · USGS 01591610 |
53 cfs | 1.71 ft | 70°F | 71°F | 310 ft | Patuxent |
|
Wills Creek Near Cumberland, Md
1 day ago · USGS 01601500 |
53 cfs | 1.99 ft | · | 68°F | 703 ft | North Branch Potomac |
|
North East Branch Anacostia River At Riverdale, Md
1 day ago · USGS 01649500 |
51 cfs | · | 79°F | 74°F | 14 ft | Middle Potomac-Anacostia-Occoquan |
|
Deer Creek At Rocks, Md
1 day ago · USGS 01580000 |
40 cfs | 2.01 ft | · | 70°F | 262 ft | Lower Susquehanna |
|
Antietam Creek Near Waynesboro, Md
1 day ago · USGS 01619000 |
39 cfs | 2.24 ft | · | 69°F | 547 ft | Conococheague-Opequon |
|
Patuxent River Near Unity, Md
1 day ago · USGS 01591000 |
36 cfs | 2.36 ft | · | 71°F | 383 ft | Patuxent |
|
Big Elk Creek At Elk Mills, Md
1 day ago · USGS 01495000 |
35 cfs | 3.26 ft | · | 70°F | 70 ft | Chester-Sassafras |
|
Tuckahoe Creek Near Ruthsburg, Md
1 day ago · USGS 01491500 |
33 cfs | · | · | 72°F | 14 ft | Choptank |
|
Big Pipe Creek At Bruceville, Md
1 day ago · USGS 01639500 |
30 cfs | 1.01 ft | · | 71°F | 370 ft | Monocacy |
|
Catoctin Creek Near Middletown, Md
1 day ago · USGS 01637500 |
25 cfs | 1.75 ft | · | 71°F | 436 ft | Middle Potomac-Catoctin |
|
Georges Creek At Franklin, Md
1 day ago · USGS 01599000 |
23 cfs | 2.13 ft | · | 68°F | 975 ft | North Branch Potomac |
|
Cattail Creek Near Glenwood, Md
1 day ago · USGS 01591400 |
22 cfs | · | · | 71°F | 382 ft | Patuxent |
|
Little Falls At Blue Mount, Md
1 day ago · USGS 01582000 |
21 cfs | · | · | 70°F | 306 ft | Gunpowder-Patapsco |
|
Gwynns Falls At Villa Nova, Md
1 day ago · USGS 01589300 |
20 cfs | · | · | 71°F | 367 ft | Gunpowder-Patapsco |
|
Town Creek Near Oldtown, Md
1 day ago · USGS 01609000 |
20 cfs | 2.01 ft | · | 69°F | 567 ft | Cacapon-Town |
|
Monocacy River At Bridgeport, Md
1 day ago · USGS 01639000 |
20 cfs | 2.35 ft | · | 70°F | 332 ft | Monocacy |
|
Hawlings River Near Sandy Spring, Md
1 day ago · USGS 01591700 |
19 cfs | · | · | 71°F | 307 ft | Patuxent |
|
Western Run At Western Run, Md
1 day ago · USGS 01583500 |
17 cfs | · | · | 71°F | 265 ft | Gunpowder-Patapsco |
|
Patuxent Riv Near Laurel, Md
1 day ago · USGS 01592500 |
17 cfs | 4.27 ft | · | 73°F | 160 ft | Patuxent |
|
North Branch Patapsco River At Cedarhurst, Md
1 day ago · USGS 01586000 |
14 cfs | 1.28 ft | · | 70°F | 423 ft | Gunpowder-Patapsco |
|
Savage River Near Barton, Md
1 day ago · USGS 01596500 |
14 cfs | 1.05 ft | 69°F | 66°F | 1,659 ft | North Branch Potomac |
|
Little Gunpowder Falls At Laurel Brook, Md
1 day ago · USGS 01584500 |
13 cfs | 1.01 ft | · | 71°F | 260 ft | Gunpowder-Patapsco |
|
Jones Falls At Sorrento, Md
1 day ago · USGS 01589440 |
11 cfs | 7.81 ft | · | 72°F | 236 ft | Gunpowder-Patapsco |
|
Gunpowder Falls At Hoffmanville, Md
1 day ago · USGS 01581810 |
10 cfs | 1.10 ft | · | 69°F | 550 ft | Gunpowder-Patapsco |
|
Beaverdam Run At Cockeysville, Md
1 day ago · USGS 01583600 |
10 cfs | 2.14 ft | · | 71°F | 245 ft | Gunpowder-Patapsco |
|
Unicorn Branch Near Millington, Md
1 day ago · USGS 01493000 |
9 cfs | 1.43 ft | · | 71°F | 8 ft | Chester-Sassafras |
|
Winters Run Near Benson, Md
1 day ago · USGS 01581700 |
9 cfs | 1.19 ft | · | 71°F | 190 ft | Gunpowder-Patapsco |
|
Morgan Run Near Louisville, Md
1 day ago · USGS 01586610 |
8 cfs | 1.33 ft | · | 70°F | 430 ft | Gunpowder-Patapsco |
|
Choptank River Near Greensboro, Md
1 day ago · USGS 01491000 |
7 cfs | 1.90 ft | 79°F | 72°F | 5 ft | Choptank |
|
St Marys River At Great Mills, Md
1 day ago · USGS 01661500 |
7 cfs | 1.47 ft | · | 76°F | 13 ft | Lower Potomac |
|
Beetree Run At Bentley Springs, Md
1 day ago · USGS 01581960 |
7 cfs | · | · | 69°F | 491 ft | Gunpowder-Patapsco |
|
Marsh Run At Grimes, Md
1 day ago · USGS 01617800 |
6 cfs | 1.06 ft | · | 70°F | 405 ft | Conococheague-Opequon |
|
Beaver Run Near Finksburg, Md
1 day ago · USGS 01586210 |
6 cfs | · | · | 70°F | 431 ft | Gunpowder-Patapsco |
|
Georges Run Near Beckleysville, Md
1 day ago · USGS 01581870 |
5 cfs | · | · | 70°F | 521 ft | Gunpowder-Patapsco |
|
Sawmill Creek At Glen Burnie, Md
1 day ago · USGS 01589500 |
5 cfs | 1.96 ft | · | 74°F | 34 ft | Gunpowder-Patapsco |
|
Morgan Creek Near Kennedyville, Md
1 day ago · USGS 01493500 |
5 cfs | 1.30 ft | · | 71°F | 4 ft | Chester-Sassafras |
|
Piney Run At Dover, Md
1 day ago · USGS 01583100 |
5 cfs | 1.41 ft | · | 70°F | 380 ft | Gunpowder-Patapsco |
|
Sallie Harris Creek Near Carmichael, Md
1 day ago · USGS 01492500 |
4 cfs | · | · | 73°F | 14 ft | Chester-Sassafras |
|
Sideling Hill Creek Near Bellegrove, Md
1 day ago · USGS 01610155 |
4 cfs | · | · | 69°F | 482 ft | Cacapon-Town |
|
Whitemarsh Run At White Marsh, Md
1 day ago · USGS 01585100 |
4 cfs | 3.37 ft | · | 74°F | 42 ft | Gunpowder-Patapsco |
|
Dead Run At Franklintown, Md
1 day ago · USGS 01589330 |
4 cfs | · | · | 72°F | 313 ft | Gunpowder-Patapsco |
|
Pocomoke River Near Willards, Md
1 day ago · USGS 01485000 |
3 cfs | 4.26 ft | · | 76°F | 22 ft | Pocomoke |
|
Grave Run Near Beckleysville, Md
1 day ago · USGS 01581830 |
3 cfs | · | · | 69°F | 560 ft | Gunpowder-Patapsco |
|
East Branch Herbert Run At Arbutus, Md
1 day ago · USGS 01589100 |
3 cfs | · | · | 73°F | 49 ft | Gunpowder-Patapsco |
|
Gwynns Falls Near Delight, Md
1 day ago · USGS 01589197 |
3 cfs | · | · | 71°F | 536 ft | Gunpowder-Patapsco |
|
Long Green Creek At Glen Arm, Md
1 day ago · USGS 01584050 |
3 cfs | · | · | 71°F | 290 ft | Gunpowder-Patapsco |
|
Chicamacomico River Near Salem, Md
1 day ago · USGS 01490000 |
2 cfs | · | · | 75°F | 2 ft | Blackwater-Wicomico |
|
Nassawango Creek Near Snow Hill, Md
1 day ago · USGS 01485500 |
2 cfs | 1.28 ft | · | 76°F | 21 ft | Pocomoke |
|
Bynum Run At Bel Air, Md
1 day ago · USGS 01581500 |
2 cfs | · | · | 70°F | 260 ft | Gunpowder-Patapsco |
|
Chesterville Branch Near Crumpton, Md
3 days ago · USGS 01493112 |
2 cfs | 1.28 ft | 51°F | 71°F | 10 ft | Chester-Sassafras |
|
Nw Branch Anacostia River Near Colesville, Md
1 day ago · USGS 01650500 |
2 cfs | 1.31 ft | · | 73°F | 271 ft | Middle Potomac-Anacostia-Occoquan |
|
St Clement Creek Near Clements, Md
1 day ago · USGS 01661050 |
1 cfs | · | · | 74°F | 11 ft | Lower Potomac |
|
Whitemarsh Run Near Fullerton, Md
1 day ago · USGS 01585090 |
1 cfs | 1.15 ft | · | 74°F | 138 ft | Gunpowder-Patapsco |
|
Plumtree Run Near Bel Air, Md
1 day ago · USGS 01581752 |
1 cfs | · | 73°F | 71°F | 187 ft | Gunpowder-Patapsco |
|
Birch Branch At Showell, Md
1 day ago · USGS 0148471320 |
1 cfs | 3.22 ft | · | 76°F | 6 ft | Chincoteague |
|
Cranberry Branch Near Westminster, Md
1 day ago · USGS 01585500 |
1 cfs | 1.30 ft | · | 70°F | 672 ft | Gunpowder-Patapsco |
|
Minebank Run Near Glen Arm, Md
1 day ago · USGS 0158397967 |
1 cfs | 4.13 ft | · | 72°F | 225 ft | Gunpowder-Patapsco |
|
West Branch Herring Run At Idlewylde, Md
1 day ago · USGS 01585200 |
1 cfs | · | · | 73°F | 286 ft | Gunpowder-Patapsco |
|
Manokin Branch Near Princess Anne, Md
1 day ago · USGS 01486000 |
1 cfs | 1.48 ft | · | 77°F | 14 ft | Pocomoke |
|
Zekiah Swamp Run Near Newtown, Md
1 day ago · USGS 01660920 |
1 cfs | · | · | 73°F | 37 ft | Lower Potomac |
|
Honeygo Run Near White Marsh, Md
1 day ago · USGS 01585104 |
0 cfs | · | · | 73°F | 25 ft | Gunpowder-Patapsco |
|
Baisman Run At Broadmoor, Md
1 day ago · USGS 01583580 |
0 cfs | 1.09 ft | · | 71°F | 333 ft | Gunpowder-Patapsco |
|
South Fork Jabez Branch At Millersville, Md
1 day ago · USGS 01589795 |
0 cfs | 3.20 ft | · | 74°F | 60 ft | Severn |
|
Piscataway Creek At Piscataway, Md
1 day ago · USGS 01653600 |
0 cfs | 1.69 ft | · | 74°F | 16 ft | Middle Potomac-Anacostia-Occoquan |
|
Mattawoman Creek Near Pomonkey, Md
1 day ago · USGS 01658000 |
0 cfs | 1.49 ft | 73°F | 73°F | 46 ft | Lower Potomac |
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Flow report FAQ
About Maryland streamflow
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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