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
99%
Paddle runs
0
Updated
Jul 16
Open the Maryland flow layer on the map
Every USGS streamgauge filtered to Maryland.
Open the map →
July
16
2026
Flow briefing
Streamflow levels across Maryland are currently 99% of normal, with the Susquehanna River At Conowingo reporting the highest discharge in the state at 5,900 cfs and a gauge stage of 9.49 ft.
Meanwhile, the Potomac River At Point Of Rocks is seeing a spike today — up 7% 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 Natural Disaster Report
Maryland is currently under statewide Code Orange Air Quality Alerts due to ground-level ozone concentrations, effective through midnight Thursday. The Maryland Department of the Environment has issued alerts affecting all major regions including Baltimore City Metro, Annapolis, Northern Baltimore, Northeast Maryland, the Maryland Piedmont, Southern Maryland, the suburban DC region, and the Eastern Shore, including Kent, Queen Annes, Talbot, and Caroline Counties. Sensitive groups—children, elderly residents, and individuals with asthma, heart disease, or lung diseases—should avoid strenuous outdoor activity. Air quality may become unhealthy for these vulnerable populations. Residents are urged to limit outdoor exertion and monitor the Maryland Department of the Environment website for updates at mde.maryland.gov/programs/air/ for real-time air quality information and health recommendations.
Maryland is currently under statewide Code Orange Air Quality Alerts due to ground-level ozone concentrations, effective through midnight Thursday. The Maryland Department of the Environment has issued alerts affecting all major regions including Baltimore City Metro, Annapolis, Northern Baltimore, Northeast Maryland, the Maryland Piedmont, Southern Maryland, the suburban DC region, and the Eastern Shore, including Kent, Queen Annes, Talbot, and Caroline Counties. Sensitive groups—children, elderly residents, and individuals with asthma, heart disease, or lung diseases—should avoid strenuous outdoor activity. Air quality may become unhealthy for these vulnerable populations. Residents are urged to limit outdoor exertion and monitor the Maryland Department of the Environment website for updates at mde.maryland.gov/programs/air/ for real-time air quality information and health recommendations.
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
99%
100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.
Highest discharge
Susquehanna River At Conowingo
5,900 cfs
Gauge stage 9.49 ft
Biggest 24h spike
Potomac River At Point Of Rocks
+7%
Now 4,030 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
19 hours ago · USGS 01578310 |
30,800 cfs | 12.87 ft | · | 74°F | 21 ft | Lower Susquehanna |
|
Potomac River At Point Of Rocks, Md
19 hours ago · USGS 01638500 |
3,770 cfs | 1.93 ft | 87°F | 75°F | 192 ft | Middle Potomac-Catoctin |
|
Potomac River Near Wash, Md
19 hours ago · USGS 01646500 |
3,630 cfs | 3.14 ft | 45°F | 78°F | 43 ft | Middle Potomac-Catoctin |
|
Potomac River At Hancock, Md
19 hours ago · USGS 01613000 |
1,570 cfs | 3.81 ft | · | 73°F | 396 ft | Conococheague-Opequon |
|
Potomac River At Paw Paw, Md
19 hours ago · USGS 01610000 |
1,290 cfs | 4.75 ft | · | 73°F | 501 ft | Cacapon-Town |
|
North Branch Potomac River Near Cumberland, Md
19 hours ago · USGS 01603000 |
476 cfs | 2.65 ft | · | 72°F | 589 ft | North Branch Potomac |
|
Gunpowder Falls At Glencoe, Md
19 hours ago · USGS 01582500 |
188 cfs | 1.58 ft | · | 75°F | 247 ft | Gunpowder-Patapsco |
|
Monocacy River At Jug Bridge Near Frederick, Md
7 hours ago · USGS 01643000 |
182 cfs | 1.71 ft | · | 75°F | 231 ft | Monocacy |
|
Youghiogheny River At Friendsville, Md
19 hours ago · USGS 03076500 |
182 cfs | 2.56 ft | 77°F | 70°F | 1,555 ft | Youghiogheny |
|
Gunpowder Falls Near Parkton, Md
19 hours ago · USGS 01581920 |
161 cfs | 2.20 ft | 65°F | 74°F | 352 ft | Gunpowder-Patapsco |
|
Monocacy River At Monocacy Blvd At Frederick, Md
19 hours ago · USGS 01642190 |
147 cfs | 1.81 ft | · | 75°F | 259 ft | Monocacy |
|
Conococheague Creek At Fairview, Md
19 hours ago · USGS 01614500 |
139 cfs | 1.57 ft | · | 74°F | 438 ft | Conococheague-Opequon |
|
Antietam Creek Near Sharpsburg, Md
19 hours ago · USGS 01619500 |
115 cfs | 2.37 ft | · | 74°F | 367 ft | Conococheague-Opequon |
|
Patuxent River Below Brighton Dam Near Brighton, Md
19 hours ago · USGS 01591610 |
113 cfs | 2.02 ft | 70°F | 75°F | 310 ft | Patuxent |
|
Youghiogheny River Near Oakland, Md
19 hours ago · USGS 03075500 |
111 cfs | 2.38 ft | · | 67°F | 2,370 ft | Youghiogheny |
|
Patuxent River Near Bowie, Md
19 hours ago · USGS 01594440 |
108 cfs | 4.13 ft | · | 78°F | 20 ft | Patuxent |
|
North Branch Potomac River At Kitzmiller, Md
19 hours ago · USGS 01595500 |
96 cfs | 2.18 ft | · | 71°F | 1,575 ft | North Branch Potomac |
|
Wills Creek Near Cumberland, Md
19 hours ago · USGS 01601500 |
72 cfs | 2.15 ft | · | 72°F | 703 ft | North Branch Potomac |
|
Savage Riv Bl Savage Riv Dam Near Bloomington, Md
19 hours ago · USGS 01597500 |
64 cfs | · | 59°F | 71°F | 1,382 ft | North Branch Potomac |
|
Deer Creek Near Darlington, Md
19 hours ago · USGS 01580520 |
58 cfs | 1.06 ft | · | 74°F | 49 ft | Lower Susquehanna |
|
Seneca Creek At Dawsonville, Md
19 hours ago · USGS 01645000 |
55 cfs | 2.03 ft | · | 75°F | 216 ft | Middle Potomac-Catoctin |
|
North Branch Potomac River At Steyer, Md
19 hours ago · USGS 01595000 |
50 cfs | 2.29 ft | · | 68°F | 2,276 ft | North Branch Potomac |
|
Bear Creek At Friendsville, Md
19 hours ago · USGS 03076600 |
46 cfs | 1.74 ft | · | 70°F | 1,640 ft | Youghiogheny |
|
Deer Creek At Rocks, Md
19 hours ago · USGS 01580000 |
39 cfs | 2.00 ft | · | 74°F | 262 ft | Lower Susquehanna |
|
Patapsco River At Hollofield, Md
19 hours ago · USGS 01589000 |
37 cfs | 1.40 ft | · | 76°F | 190 ft | Gunpowder-Patapsco |
|
Antietam Creek Near Waynesboro, Md
19 hours ago · USGS 01619000 |
33 cfs | 2.19 ft | · | 74°F | 547 ft | Conococheague-Opequon |
|
Casselman River At Grantsville, Md
19 hours ago · USGS 03078000 |
31 cfs | 1.02 ft | · | 69°F | 2,135 ft | Youghiogheny |
|
Town Creek Near Oldtown, Md
19 hours ago · USGS 01609000 |
29 cfs | 2.13 ft | · | 72°F | 567 ft | Cacapon-Town |
|
Monocacy River At Bridgeport, Md
19 hours ago · USGS 01639000 |
26 cfs | 2.47 ft | · | 74°F | 332 ft | Monocacy |
|
Big Elk Creek At Elk Mills, Md
19 hours ago · USGS 01495000 |
25 cfs | 3.12 ft | · | 74°F | 70 ft | Chester-Sassafras |
|
Gwynns Falls At Washington Blvd At Baltimore, Md
19 hours ago · USGS 01589352 |
21 cfs | 2.33 ft | · | 80°F | 18 ft | Gunpowder-Patapsco |
|
Little Falls At Blue Mount, Md
18 hours ago · USGS 01582000 |
20 cfs | · | · | 74°F | 306 ft | Gunpowder-Patapsco |
|
Bennett Creek At Park Mills, Md
19 hours ago · USGS 01643500 |
19 cfs | 1.55 ft | · | 75°F | 304 ft | Monocacy |
|
Georges Creek At Franklin, Md
19 hours ago · USGS 01599000 |
19 cfs | 2.06 ft | · | 71°F | 975 ft | North Branch Potomac |
|
Little Patuxent River At Savage, Md
7 hours ago · USGS 01594000 |
19 cfs | 2.80 ft | · | 77°F | 126 ft | Patuxent |
|
Patuxent Riv Near Laurel, Md
18 hours ago · USGS 01592500 |
17 cfs | 4.28 ft | · | 77°F | 160 ft | Patuxent |
|
Western Run At Western Run, Md
19 hours ago · USGS 01583500 |
17 cfs | · | · | 75°F | 265 ft | Gunpowder-Patapsco |
|
Big Pipe Creek At Bruceville, Md
19 hours ago · USGS 01639500 |
16 cfs | · | · | 74°F | 370 ft | Monocacy |
|
Savage River Near Barton, Md
19 hours ago · USGS 01596500 |
15 cfs | 1.07 ft | 74°F | 70°F | 1,659 ft | North Branch Potomac |
|
North East Branch Anacostia River At Riverdale, Md
7 hours ago · USGS 01649500 |
15 cfs | · | 81°F | 79°F | 14 ft | Middle Potomac-Anacostia-Occoquan |
|
North Branch Patapsco River At Cedarhurst, Md
19 hours ago · USGS 01586000 |
13 cfs | 1.26 ft | · | 75°F | 423 ft | Gunpowder-Patapsco |
|
Little Gunpowder Falls At Laurel Brook, Md
19 hours ago · USGS 01584500 |
13 cfs | 1.01 ft | · | 75°F | 260 ft | Gunpowder-Patapsco |
|
Patuxent River Near Unity, Md
19 hours ago · USGS 01591000 |
13 cfs | 1.98 ft | · | 75°F | 383 ft | Patuxent |
|
St Marys River At Great Mills, Md
19 hours ago · USGS 01661500 |
11 cfs | 1.55 ft | · | 78°F | 13 ft | Lower Potomac |
|
Catoctin Creek Near Middletown, Md
19 hours ago · USGS 01637500 |
10 cfs | 1.58 ft | · | 74°F | 436 ft | Middle Potomac-Catoctin |
|
Sideling Hill Creek Near Bellegrove, Md
19 hours ago · USGS 01610155 |
10 cfs | · | · | 72°F | 482 ft | Cacapon-Town |
|
Hawlings River Near Sandy Spring, Md
19 hours ago · USGS 01591700 |
10 cfs | · | · | 75°F | 307 ft | Patuxent |
|
Tuckahoe Creek Near Ruthsburg, Md
8 hours ago · USGS 01491500 |
9 cfs | · | · | 76°F | 14 ft | Choptank |
|
Cattail Creek Near Glenwood, Md
19 hours ago · USGS 01591400 |
9 cfs | · | · | 75°F | 382 ft | Patuxent |
|
Western Branch At Upper Marlboro, Md
7 hours ago · USGS 01594526 |
9 cfs | 1.49 ft | · | 78°F | 9 ft | Patuxent |
|
Jones Falls At Sorrento, Md
19 hours ago · USGS 01589440 |
8 cfs | 7.77 ft | · | 77°F | 236 ft | Gunpowder-Patapsco |
|
Winters Run Near Benson, Md
18 hours ago · USGS 01581700 |
8 cfs | 1.18 ft | · | 75°F | 190 ft | Gunpowder-Patapsco |
|
Gwynns Falls At Villa Nova, Md
7 hours ago · USGS 01589300 |
7 cfs | · | · | 76°F | 367 ft | Gunpowder-Patapsco |
|
Morgan Run Near Louisville, Md
19 hours ago · USGS 01586610 |
7 cfs | 1.30 ft | · | 74°F | 430 ft | Gunpowder-Patapsco |
|
Gunpowder Falls At Hoffmanville, Md
19 hours ago · USGS 01581810 |
7 cfs | 1.01 ft | · | 74°F | 550 ft | Gunpowder-Patapsco |
|
Beaverdam Run At Cockeysville, Md
19 hours ago · USGS 01583600 |
7 cfs | 2.01 ft | · | 75°F | 245 ft | Gunpowder-Patapsco |
|
Unicorn Branch Near Millington, Md
19 hours ago · USGS 01493000 |
7 cfs | 1.22 ft | · | 75°F | 8 ft | Chester-Sassafras |
|
Choptank River Near Greensboro, Md
19 hours ago · USGS 01491000 |
7 cfs | 1.81 ft | 85°F | 77°F | 5 ft | Choptank |
|
Marsh Run At Grimes, Md
18 hours ago · USGS 01617800 |
6 cfs | 1.06 ft | · | 74°F | 405 ft | Conococheague-Opequon |
|
Beaver Run Near Finksburg, Md
19 hours ago · USGS 01586210 |
6 cfs | · | · | 75°F | 431 ft | Gunpowder-Patapsco |
|
Georges Run Near Beckleysville, Md
19 hours ago · USGS 01581870 |
5 cfs | · | · | 74°F | 521 ft | Gunpowder-Patapsco |
|
Zekiah Swamp Run Near Newtown, Md
19 hours ago · USGS 01660920 |
5 cfs | · | · | 76°F | 37 ft | Lower Potomac |
|
Chesterville Branch Near Crumpton, Md
19 hours ago · USGS 01493112 |
5 cfs | 1.25 ft | 51°F | 76°F | 10 ft | Chester-Sassafras |
|
Little Patuxent River At Guilford, Md
19 hours ago · USGS 01593500 |
4 cfs | 1.57 ft | · | 76°F | 267 ft | Patuxent |
|
Piney Run At Dover, Md
19 hours ago · USGS 01583100 |
4 cfs | 1.40 ft | · | 75°F | 380 ft | Gunpowder-Patapsco |
|
Beetree Run At Bentley Springs, Md
19 hours ago · USGS 01581960 |
4 cfs | · | · | 74°F | 491 ft | Gunpowder-Patapsco |
|
Pocomoke River Near Willards, Md
19 hours ago · USGS 01485000 |
4 cfs | 4.23 ft | · | 77°F | 22 ft | Pocomoke |
|
Grave Run Near Beckleysville, Md
19 hours ago · USGS 01581830 |
3 cfs | · | · | 74°F | 560 ft | Gunpowder-Patapsco |
|
St Clement Creek Near Clements, Md
19 hours ago · USGS 01661050 |
3 cfs | · | · | 76°F | 11 ft | Lower Potomac |
|
Sawmill Creek At Glen Burnie, Md
19 hours ago · USGS 01589500 |
3 cfs | 1.86 ft | · | 78°F | 34 ft | Gunpowder-Patapsco |
|
Morgan Creek Near Kennedyville, Md
19 hours ago · USGS 01493500 |
2 cfs | 1.21 ft | · | 76°F | 4 ft | Chester-Sassafras |
|
Sallie Harris Creek Near Carmichael, Md
19 hours ago · USGS 01492500 |
2 cfs | · | · | 78°F | 14 ft | Chester-Sassafras |
|
Long Green Creek At Glen Arm, Md
19 hours ago · USGS 01584050 |
2 cfs | · | · | 75°F | 290 ft | Gunpowder-Patapsco |
|
Bynum Run At Bel Air, Md
18 hours ago · USGS 01581500 |
2 cfs | · | · | 74°F | 260 ft | Gunpowder-Patapsco |
|
Nassawango Creek Near Snow Hill, Md
19 hours ago · USGS 01485500 |
2 cfs | 1.30 ft | · | 78°F | 21 ft | Pocomoke |
|
Chicamacomico River Near Salem, Md
19 hours ago · USGS 01490000 |
2 cfs | · | · | 77°F | 2 ft | Blackwater-Wicomico |
|
Dead Run At Franklintown, Md
19 hours ago · USGS 01589330 |
2 cfs | · | · | 77°F | 313 ft | Gunpowder-Patapsco |
|
Nw Branch Anacostia River Near Colesville, Md
19 hours ago · USGS 01650500 |
2 cfs | 1.33 ft | · | 77°F | 271 ft | Middle Potomac-Anacostia-Occoquan |
|
Gwynns Falls Near Delight, Md
19 hours ago · USGS 01589197 |
2 cfs | · | · | 75°F | 536 ft | Gunpowder-Patapsco |
|
Whitemarsh Run At White Marsh, Md
12 hours ago · USGS 01585100 |
1 cfs | 3.25 ft | · | 78°F | 42 ft | Gunpowder-Patapsco |
|
Plumtree Run Near Bel Air, Md
19 hours ago · USGS 01581752 |
1 cfs | · | 76°F | 75°F | 187 ft | Gunpowder-Patapsco |
|
Mattawoman Creek Near Pomonkey, Md
19 hours ago · USGS 01658000 |
1 cfs | 1.97 ft | 73°F | 76°F | 46 ft | Lower Potomac |
|
Cranberry Branch Near Westminster, Md
7 hours ago · USGS 01585500 |
1 cfs | 1.29 ft | · | 74°F | 672 ft | Gunpowder-Patapsco |
|
Birch Branch At Showell, Md
19 hours ago · USGS 0148471320 |
1 cfs | 3.12 ft | · | 78°F | 6 ft | Chincoteague |
|
East Branch Herbert Run At Arbutus, Md
19 hours ago · USGS 01589100 |
1 cfs | · | · | 78°F | 49 ft | Gunpowder-Patapsco |
|
Manokin Branch Near Princess Anne, Md
19 hours ago · USGS 01486000 |
0 cfs | 1.46 ft | · | 78°F | 14 ft | Pocomoke |
|
Piscataway Creek At Piscataway, Md
19 hours ago · USGS 01653600 |
0 cfs | 1.88 ft | · | 77°F | 16 ft | Middle Potomac-Anacostia-Occoquan |
|
West Branch Herring Run At Idlewylde, Md
19 hours ago · USGS 01585200 |
0 cfs | · | · | 77°F | 286 ft | Gunpowder-Patapsco |
|
Whitemarsh Run Near Fullerton, Md
19 hours ago · USGS 01585090 |
0 cfs | 1.05 ft | · | 78°F | 138 ft | Gunpowder-Patapsco |
|
Honeygo Run Near White Marsh, Md
19 hours ago · USGS 01585104 |
0 cfs | · | · | 77°F | 25 ft | Gunpowder-Patapsco |
|
Minebank Run Near Glen Arm, Md
18 hours ago · USGS 0158397967 |
0 cfs | 4.07 ft | · | 77°F | 225 ft | Gunpowder-Patapsco |
|
Baisman Run At Broadmoor, Md
19 hours ago · USGS 01583580 |
0 cfs | 1.07 ft | · | 76°F | 333 ft | Gunpowder-Patapsco |
|
South Fork Jabez Branch At Millersville, Md
19 hours ago · USGS 01589795 |
0 cfs | 3.19 ft | · | 78°F | 60 ft | Severn |
🔒 Premium
See every Maryland gauge ranked against normal.
- Percentile rank & % of median for all 93 gauges
- 15-day PULSE forecast on every gauge
- Custom flow alerts & full daily history
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.
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