Flow report
Maryland River Levels & Streamflow
As of Aug 24, 2026, Maryland rivers are running at 144% of normal across 92 USGS gauges — the highest is 5,980 cfs on the Susquehanna River At Conowingo. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in Maryland.
USGS gauges
92
State percent normal
144%
Paddle runs
0
Updated
Aug 24
Open the Maryland flow layer on the map
Every USGS streamgauge filtered to Maryland.
Open the map →
August
24
2026
Flow briefing
Streamflow levels across Maryland are currently 144% of normal, with the Susquehanna River At Conowingo reporting the highest discharge in the state at 5,980 cfs and a gauge stage of 9.51 ft.
Meanwhile, the Zekiah Swamp Run Near Newtown is seeing a spike today — up 3046% 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
Currently, no active weather warnings or alerts are in effect for Maryland. The National Weather Service is monitoring conditions across the state, including Baltimore, Annapolis, and Southern Maryland communities. Residents can expect quiet conditions overnight with comfortable temperatures. However, forecasters indicate storms may develop late in the week, so residents should monitor updates regularly. No immediate threats to major population centers are anticipated at this time, but preparation for potential severe weather later this week is recommended.
Currently, no active weather warnings or alerts are in effect for Maryland. The National Weather Service is monitoring conditions across the state, including Baltimore, Annapolis, and Southern Maryland communities. Residents can expect quiet conditions overnight with comfortable temperatures. However, forecasters indicate storms may develop late in the week, so residents should monitor updates regularly. No immediate threats to major population centers are anticipated at this time, but preparation for potential severe weather later this week is recommended.
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
144%
100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.
Highest discharge
Susquehanna River At Conowingo
5,980 cfs
Gauge stage 9.51 ft
Biggest 24h spike
Zekiah Swamp Run Near Newtown
+3046%
Now 431 cfs
Network coverage
Gauges + rivers tracked
92 + 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 |
5,980 cfs | 9.51 ft | · | 59°F | 21 ft | Lower Susquehanna |
|
Potomac River At Point Of Rocks, Md
7 hours ago · USGS 01638500 |
3,330 cfs | 1.89 ft | 78°F | 59°F | 192 ft | Middle Potomac-Catoctin |
|
Potomac River Near Wash, Md
7 hours ago · USGS 01646500 |
3,060 cfs | 3.04 ft | 45°F | 62°F | 43 ft | Middle Potomac-Catoctin |
|
Potomac River At Paw Paw, Md
7 hours ago · USGS 01610000 |
2,120 cfs | 5.67 ft | · | 57°F | 501 ft | Cacapon-Town |
|
Potomac River At Hancock, Md
7 hours ago · USGS 01613000 |
1,640 cfs | 3.87 ft | · | 57°F | 396 ft | Conococheague-Opequon |
|
North Branch Potomac River Near Cumberland, Md
6 hours ago · USGS 01603000 |
1,390 cfs | 3.55 ft | · | 57°F | 589 ft | North Branch Potomac |
|
Monocacy River At Jug Bridge Near Frederick, Md
6 hours ago · USGS 01643000 |
1,240 cfs | 4.00 ft | · | 58°F | 231 ft | Monocacy |
|
Monocacy River At Monocacy Blvd At Frederick, Md
7 hours ago · USGS 01642190 |
1,100 cfs | 4.18 ft | · | 59°F | 259 ft | Monocacy |
|
Conococheague Creek At Fairview, Md
7 hours ago · USGS 01614500 |
810 cfs | 3.20 ft | · | 57°F | 438 ft | Conococheague-Opequon |
|
Youghiogheny River At Friendsville, Md
6 hours ago · USGS 03076500 |
363 cfs | 2.82 ft | 65°F | 55°F | 1,555 ft | Youghiogheny |
|
Wills Creek Near Cumberland, Md
7 hours ago · USGS 01601500 |
328 cfs | 3.14 ft | · | 57°F | 703 ft | North Branch Potomac |
|
Zekiah Swamp Run Near Newtown, Md
7 hours ago · USGS 01660920 |
242 cfs | 2.46 ft | · | 61°F | 37 ft | Lower Potomac |
|
Deer Creek Near Darlington, Md
7 hours ago · USGS 01580520 |
209 cfs | 1.92 ft | · | 59°F | 49 ft | Lower Susquehanna |
|
Patuxent River Near Bowie, Md
6 hours ago · USGS 01594440 |
181 cfs | 4.66 ft | · | 61°F | 20 ft | Patuxent |
|
Antietam Creek Near Sharpsburg, Md
6 hours ago · USGS 01619500 |
169 cfs | 2.59 ft | · | 58°F | 367 ft | Conococheague-Opequon |
|
Gunpowder Falls At Glencoe, Md
7 hours ago · USGS 01582500 |
153 cfs | 1.40 ft | · | 59°F | 247 ft | Gunpowder-Patapsco |
|
Monocacy River At Bridgeport, Md
6 hours ago · USGS 01639000 |
136 cfs | 3.51 ft | · | 57°F | 332 ft | Monocacy |
|
Youghiogheny River Near Oakland, Md
7 hours ago · USGS 03075500 |
111 cfs | 2.38 ft | · | 52°F | 2,370 ft | Youghiogheny |
|
Gunpowder Falls Near Parkton, Md
7 hours ago · USGS 01581920 |
108 cfs | 1.98 ft | 59°F | 59°F | 352 ft | Gunpowder-Patapsco |
|
North Branch Potomac River At Kitzmiller, Md
7 hours ago · USGS 01595500 |
107 cfs | 2.16 ft | · | 55°F | 1,575 ft | North Branch Potomac |
|
Town Creek Near Oldtown, Md
7 hours ago · USGS 01609000 |
87 cfs | 2.63 ft | · | 57°F | 567 ft | Cacapon-Town |
|
Bear Creek At Friendsville, Md
6 hours ago · USGS 03076600 |
87 cfs | 2.13 ft | · | 55°F | 1,640 ft | Youghiogheny |
|
Tuckahoe Creek Near Ruthsburg, Md
7 hours ago · USGS 01491500 |
83 cfs | 1.36 ft | · | 62°F | 14 ft | Choptank |
|
Patapsco River At Hollofield, Md
7 hours ago · USGS 01589000 |
82 cfs | 1.68 ft | · | 60°F | 190 ft | Gunpowder-Patapsco |
|
Deer Creek At Rocks, Md
7 hours ago · USGS 01580000 |
76 cfs | 2.24 ft | · | 59°F | 262 ft | Lower Susquehanna |
|
Big Pipe Creek At Bruceville, Md
7 hours ago · USGS 01639500 |
75 cfs | 1.35 ft | · | 57°F | 370 ft | Monocacy |
|
North Branch Potomac River At Steyer, Md
7 hours ago · USGS 01595000 |
73 cfs | 2.42 ft | · | 53°F | 2,276 ft | North Branch Potomac |
|
Seneca Creek At Dawsonville, Md
7 hours ago · USGS 01645000 |
72 cfs | 2.08 ft | · | 59°F | 216 ft | Middle Potomac-Catoctin |
|
Choptank River Near Greensboro, Md
7 hours ago · USGS 01491000 |
69 cfs | 2.93 ft | 75°F | 61°F | 5 ft | Choptank |
|
Antietam Creek Near Waynesboro, Md
7 hours ago · USGS 01619000 |
67 cfs | 2.44 ft | · | 57°F | 547 ft | Conococheague-Opequon |
|
Big Elk Creek At Elk Mills, Md
7 hours ago · USGS 01495000 |
63 cfs | 3.49 ft | · | 60°F | 70 ft | Chester-Sassafras |
|
Savage Riv Bl Savage Riv Dam Near Bloomington, Md
7 hours ago · USGS 01597500 |
63 cfs | · | 57°F | 55°F | 1,382 ft | North Branch Potomac |
|
Casselman River At Grantsville, Md
6 hours ago · USGS 03078000 |
60 cfs | 1.31 ft | · | 53°F | 2,135 ft | Youghiogheny |
|
Little Patuxent River At Savage, Md
7 hours ago · USGS 01594000 |
44 cfs | 3.15 ft | · | 61°F | 126 ft | Patuxent |
|
Western Branch At Upper Marlboro, Md
7 hours ago · USGS 01594526 |
44 cfs | 2.12 ft | · | 62°F | 9 ft | Patuxent |
|
Catoctin Creek Near Middletown, Md
7 hours ago · USGS 01637500 |
35 cfs | 1.84 ft | · | 58°F | 436 ft | Middle Potomac-Catoctin |
|
Little Falls At Blue Mount, Md
7 hours ago · USGS 01582000 |
32 cfs | · | · | 59°F | 306 ft | Gunpowder-Patapsco |
|
Gwynns Falls At Washington Blvd At Baltimore, Md
7 hours ago · USGS 01589352 |
32 cfs | 2.47 ft | · | 63°F | 18 ft | Gunpowder-Patapsco |
|
Mattawoman Creek Near Pomonkey, Md
7 hours ago · USGS 01658000 |
31 cfs | 2.56 ft | 73°F | 61°F | 46 ft | Lower Potomac |
|
Western Run At Western Run, Md
6 hours ago · USGS 01583500 |
30 cfs | · | · | 59°F | 265 ft | Gunpowder-Patapsco |
|
Bennett Creek At Park Mills, Md
7 hours ago · USGS 01643500 |
29 cfs | 1.62 ft | · | 58°F | 304 ft | Monocacy |
|
North Branch Patapsco River At Cedarhurst, Md
7 hours ago · USGS 01586000 |
29 cfs | 1.43 ft | · | 58°F | 423 ft | Gunpowder-Patapsco |
|
Little Patuxent River At Guilford, Md
7 hours ago · USGS 01593500 |
24 cfs | 2.18 ft | · | 60°F | 267 ft | Patuxent |
|
Savage River Near Barton, Md
7 hours ago · USGS 01596500 |
23 cfs | 1.19 ft | 63°F | 54°F | 1,659 ft | North Branch Potomac |
|
Patuxent Riv Near Laurel, Md
7 hours ago · USGS 01592500 |
20 cfs | 4.33 ft | · | 60°F | 160 ft | Patuxent |
|
Winters Run Near Benson, Md
7 hours ago · USGS 01581700 |
19 cfs | 1.32 ft | · | 60°F | 190 ft | Gunpowder-Patapsco |
|
Unicorn Branch Near Millington, Md
7 hours ago · USGS 01493000 |
19 cfs | 2.00 ft | · | 61°F | 8 ft | Chester-Sassafras |
|
North East Branch Anacostia River At Riverdale, Md
6 hours ago · USGS 01649500 |
19 cfs | · | 73°F | 62°F | 14 ft | Middle Potomac-Anacostia-Occoquan |
|
St Marys River At Great Mills, Md
7 hours ago · USGS 01661500 |
19 cfs | 1.69 ft | · | 65°F | 13 ft | Lower Potomac |
|
Sallie Harris Creek Near Carmichael, Md
7 hours ago · USGS 01492500 |
17 cfs | 1.54 ft | · | 64°F | 14 ft | Chester-Sassafras |
|
Patuxent River Below Brighton Dam Near Brighton, Md
7 hours ago · USGS 01591610 |
17 cfs | 1.33 ft | 70°F | 59°F | 310 ft | Patuxent |
|
Little Gunpowder Falls At Laurel Brook, Md
7 hours ago · USGS 01584500 |
16 cfs | 1.07 ft | · | 60°F | 260 ft | Gunpowder-Patapsco |
|
Patuxent River Near Unity, Md
7 hours ago · USGS 01591000 |
16 cfs | 2.08 ft | · | 59°F | 383 ft | Patuxent |
|
Georges Creek At Franklin, Md
7 hours ago · USGS 01599000 |
15 cfs | 1.98 ft | · | 56°F | 975 ft | North Branch Potomac |
|
Gwynns Falls At Villa Nova, Md
6 hours ago · USGS 01589300 |
14 cfs | · | · | 60°F | 367 ft | Gunpowder-Patapsco |
|
Gunpowder Falls At Hoffmanville, Md
7 hours ago · USGS 01581810 |
14 cfs | 1.18 ft | · | 58°F | 550 ft | Gunpowder-Patapsco |
|
Morgan Creek Near Kennedyville, Md
7 hours ago · USGS 01493500 |
13 cfs | 1.63 ft | · | 62°F | 4 ft | Chester-Sassafras |
|
Beaverdam Run At Cockeysville, Md
7 hours ago · USGS 01583600 |
11 cfs | 2.20 ft | · | 60°F | 245 ft | Gunpowder-Patapsco |
|
Cattail Creek Near Glenwood, Md
7 hours ago · USGS 01591400 |
11 cfs | · | · | 59°F | 382 ft | Patuxent |
|
Morgan Run Near Louisville, Md
7 hours ago · USGS 01586610 |
11 cfs | 1.41 ft | · | 58°F | 430 ft | Gunpowder-Patapsco |
|
Hawlings River Near Sandy Spring, Md
7 hours ago · USGS 01591700 |
10 cfs | · | · | 59°F | 307 ft | Patuxent |
|
Nassawango Creek Near Snow Hill, Md
6 hours ago · USGS 01485500 |
10 cfs | 1.88 ft | · | 64°F | 21 ft | Pocomoke |
|
St Clement Creek Near Clements, Md
7 hours ago · USGS 01661050 |
9 cfs | · | · | 62°F | 11 ft | Lower Potomac |
|
Jones Falls At Sorrento, Md
7 hours ago · USGS 01589440 |
8 cfs | 7.81 ft | · | 61°F | 236 ft | Gunpowder-Patapsco |
|
Chicamacomico River Near Salem, Md
7 hours ago · USGS 01490000 |
8 cfs | · | · | 63°F | 2 ft | Blackwater-Wicomico |
|
Piscataway Creek At Piscataway, Md
6 hours ago · USGS 01653600 |
8 cfs | 2.47 ft | · | 62°F | 16 ft | Middle Potomac-Anacostia-Occoquan |
|
Georges Run Near Beckleysville, Md
7 hours ago · USGS 01581870 |
7 cfs | · | · | 59°F | 521 ft | Gunpowder-Patapsco |
|
Beetree Run At Bentley Springs, Md
7 hours ago · USGS 01581960 |
6 cfs | · | · | 58°F | 491 ft | Gunpowder-Patapsco |
|
Marsh Run At Grimes, Md
7 hours ago · USGS 01617800 |
6 cfs | 1.07 ft | · | 57°F | 405 ft | Conococheague-Opequon |
|
Pocomoke River Near Willards, Md
7 hours ago · USGS 01485000 |
6 cfs | 4.55 ft | · | 63°F | 22 ft | Pocomoke |
|
Piney Run At Dover, Md
6 hours ago · USGS 01583100 |
5 cfs | 1.46 ft | · | 59°F | 380 ft | Gunpowder-Patapsco |
|
Beaver Run Near Finksburg, Md
7 hours ago · USGS 01586210 |
5 cfs | · | · | 58°F | 431 ft | Gunpowder-Patapsco |
|
Bynum Run At Bel Air, Md
7 hours ago · USGS 01581500 |
4 cfs | · | · | 59°F | 260 ft | Gunpowder-Patapsco |
|
Nw Branch Anacostia River Near Colesville, Md
7 hours ago · USGS 01650500 |
4 cfs | 1.45 ft | · | 60°F | 271 ft | Middle Potomac-Anacostia-Occoquan |
|
Sawmill Creek At Glen Burnie, Md
7 hours ago · USGS 01589500 |
3 cfs | 1.89 ft | · | 62°F | 34 ft | Gunpowder-Patapsco |
|
Grave Run Near Beckleysville, Md
7 hours ago · USGS 01581830 |
3 cfs | · | · | 58°F | 560 ft | Gunpowder-Patapsco |
|
Long Green Creek At Glen Arm, Md
7 hours ago · USGS 01584050 |
3 cfs | · | · | 60°F | 290 ft | Gunpowder-Patapsco |
|
Gwynns Falls Near Delight, Md
7 hours ago · USGS 01589197 |
3 cfs | · | · | 59°F | 536 ft | Gunpowder-Patapsco |
|
Plumtree Run Near Bel Air, Md
7 hours ago · USGS 01581752 |
2 cfs | 1.14 ft | 68°F | 60°F | 187 ft | Gunpowder-Patapsco |
|
Whitemarsh Run At White Marsh, Md
6 hours ago · USGS 01585100 |
2 cfs | 3.02 ft | · | 63°F | 42 ft | Gunpowder-Patapsco |
|
Dead Run At Franklintown, Md
6 hours ago · USGS 01589330 |
1 cfs | · | · | 61°F | 313 ft | Gunpowder-Patapsco |
|
Sideling Hill Creek Near Bellegrove, Md
4 days ago · USGS 01610155 |
1 cfs | · | · | 57°F | 482 ft | Cacapon-Town |
|
Birch Branch At Showell, Md
7 hours ago · USGS 0148471320 |
1 cfs | 3.15 ft | · | 64°F | 6 ft | Chincoteague |
|
Manokin Branch Near Princess Anne, Md
7 hours ago · USGS 01486000 |
1 cfs | 1.51 ft | · | 64°F | 14 ft | Pocomoke |
|
Whitemarsh Run Near Fullerton, Md
7 hours ago · USGS 01585090 |
1 cfs | 1.10 ft | · | 62°F | 138 ft | Gunpowder-Patapsco |
|
Cranberry Branch Near Westminster, Md
6 hours ago · USGS 01585500 |
1 cfs | 1.30 ft | · | 58°F | 672 ft | Gunpowder-Patapsco |
|
Honeygo Run Near White Marsh, Md
7 hours ago · USGS 01585104 |
1 cfs | · | · | 62°F | 25 ft | Gunpowder-Patapsco |
|
East Branch Herbert Run At Arbutus, Md
6 hours ago · USGS 01589100 |
1 cfs | · | · | 62°F | 49 ft | Gunpowder-Patapsco |
|
West Branch Herring Run At Idlewylde, Md
7 hours ago · USGS 01585200 |
1 cfs | · | · | 61°F | 286 ft | Gunpowder-Patapsco |
|
Minebank Run Near Glen Arm, Md
6 hours ago · USGS 0158397967 |
0 cfs | 4.08 ft | · | 60°F | 225 ft | Gunpowder-Patapsco |
|
Baisman Run At Broadmoor, Md
7 hours ago · USGS 01583580 |
0 cfs | 1.09 ft | · | 60°F | 333 ft | Gunpowder-Patapsco |
|
South Fork Jabez Branch At Millersville, Md
7 hours ago · USGS 01589795 |
0 cfs | 3.20 ft | · | 62°F | 60 ft | Severn |
🔒 Premium
See every Maryland gauge ranked against normal.
- Percentile rank & % of median for all 92 gauges
- 15-day PULSE forecast on every gauge
- Custom flow alerts & full daily history
Flow report FAQ
About Maryland streamflow
What are river levels like in Maryland right now?
As of August 24, 2026, Maryland rivers are running at 144% of normal across 92 USGS streamgauges, and the Susquehanna River At Conowingo is reporting the highest discharge at 5,980 cfs. The full sortable gauge table is below.
Which Maryland river is running highest right now?
As of August 24, 2026, the highest discharge in Maryland is 5,980 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.
Browse other states
Streamflow in every state
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
District Of Columbia
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Puerto Rico
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virgin Islands
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Create a free account, or sign in.
Get the free Maryland report — alerts, favorites, and history & forecasts, plus the free iPhone app.
or
Already have an account?
Sign in