Learn and talk about St. Marys River (Maryland), Chesapeake Bay Watershed, Geography of St. Mary's County, Maryland, Rivers of Maryland, Tributaries of the Potomac River

St. Marys River
Mouth	Potomac River
Location	St. Mary's County, Maryland, USA
Length	22.3 miles (35.9 km)
Mouth elevation	0 feet (0 m)

The St. Marys River (sometimes spelled St. Mary's River) is a 22.3-mile-long (35.9 km)^[1] river in southern Maryland in the United States. It rises in southern St. Mary's County, and flows to the southeast through Great Mills, widening into a tidal estuary near St. Marys City, approximately 2 miles (3 km) wide at its mouth on the Potomac River, near the Chesapeake Bay.

References [edit]

^ "National Hydrography Dataset high-resolution flowline data". U.S. Geological Survey. Retrieved August 15, 2011.

External links [edit]

State of Maryland Geologic Survey: Rivers of Maryland

Potomac River system

Streams shown as: Major tributaries
- subtributaries
- (subsubtributaries)
- (subsubsubtributaries)

Tidal Potomac River

Gulf Branch
Donaldson Run
Maddox Branch
Windy Run
Spout Run
Foundry Branch
Rock Creek
Boundary Channel
Tiber Creek
Rocky Run
Washington Channel
Anacostia River
- Pope Branch
- Watts Branch
- Hickey Run
- Northwest Branch
  - Sligo Creek
- Northeast Branch
  - Paint Branch
Four Mile Run
Oxon Creek
Hunting Creek
- Cameron Run
Broad Creek
Henson Creek
Swan Creek
Piscataway Creek
Little Hunting Creek
Dogue Creek
Accotink Creek
- Daniels Run
Pohick Creek
Pomonkey Creek
Occoquan River
- Bull Run
- Broad Run
- Cedar Run
Neabsco Creek
Powells Creek
Mattawoman Creek
Chicamuxen Creek
Quantico Creek
Little Creek
Chopawamsic Creek
Tank Creek
Aquia Creek
Potomac Creek
- Accokeek Creek
Nanjemoy Creek
Port Tobacco River
Popes Creek (Maryland)
Gambo Creek
Piccowaxen Creek
Upper Machodoc Creek
Cuckold Creek
Wicomico River
Monroe Creek
Mattox Creek
Popes Creek (Virginia)
St. Marys River
Yeocomico River
Coan River
Hull Creek

Upper Potomac River

Shenandoah River

North Fork Shenandoah River Cedar Creek Smith Creek South Fork Shenandoah River North River (Middle River) South River

North Branch Potomac River

Stony River Abram Creek Savage River Georges Creek Laurel Run New Creek Limestone Run Warrior Run Wills Creek Brush Creek Little Wills Creek Evitts Creek Patterson Creek Mill Creek Dans Run Green Spring Run

South Branch Potomac River

North Fork South Branch Potomac River Mill Creek Seneca Creek South Fork South Branch Potomac River Kettle Creek Lunice Creek Mill Run Mill Creek Big Run Buffalo Creek

Lakes and reservoirs

Lake Accotink Lake Anne Lake Artemesia Lake Bernard Frank Lake Braddock Breckenridge Reservoir Brushy Fork Lake Burke Lake Dalecarlia Reservoir Georgetown Reservoir Jennings Randolph Lake Kingman Lake Little Seneca Lake McMillan Reservoir Mount Storm Lake Lake Needwood Sleepy Creek Lake Stony River Reservoir Tidal Basin Trout Pond Warden Lake

v t e Waters of Maryland

Bays/Estuaries	Assawoman Chesapeake Chincoteague Eastern Fishing Herring Isle of Wight Mallows Newport Pocomoke Sinepuxent Tangier

Rivers	Anacostia Annemessex (Big) Annemessex (Little) Back Bird Blackwater Blackwater (Little) Bohemia Bush Casselman Chester Chicamacomico Choptank Choptank (Little) Christina River Corsica Elk Front Gunpowder Hawlings Jones Falls Magothy Magothy (Little) Manokin Middle Miles Monocacy Monocacy (Little) Nanticoke North East Patapsco Patuxent Pocomoke Port Tobacco Potomac Rhode St. Martin St. Marys Sassafras Savage Severn South Susquehanna Transquaking Tred Avon Warwick West Wicomico (Potomac) Wicomico Wye Wye East Youghiogheny

Creeks/Runs/Streams	Antietam Alloway Ballenger Bear (Patapsco) Bear (Sideling Hill) Bear (Youghiogheny) Bennett Big Pipe Bodkin Bread and Cheese Broad (Choptank) Broad (Potomac) Broad (Susquehanna) Broad Run Budds Cabin John Carroll Catoctin Catoctin (Little) Chicamuxen Conococheague Conococheague (Little) Conowingo Cuckold Curtis Deep Run Deer Dividing Double Pipe Dry Seneca Dueling Dundee Evitts Fifteenmile Fishing Flintstone Frog Mortar Furnace Georges Great Seneca Greys Gwynns Falls Harris Henson Herring Run Honga Indian (Anacostia) Indian (Patuxent) Israel Laurel Run Licking Linganore Little Falls Branch Little Pipe Little Seneca Lyons Main Marley Marsh Marshyhope Mattawoman Meekins Middle Minnehaha Branch Moores Run Muddy Branch Nanjemoy Nassawango Northeast Branch Anacostia River Northwest Branch Anacostia River Octoraro Owens Oxon Paint Branch Parsons Piney Piscataway Pomonkey Rock (Potomac) Rock Run Rockburn Branch Roland Run Romney St. Leonard Saltpeter Sams Creek Sellman Seneca (Middle) Seneca (Potomac) Sideling Hill Slaughter Sligo Stony Swanson Toms Tonoloway Town (Patuxent) Town (Potomac) Town (Tred Avon) Towson Run Trappe Tuckahoe Turville Tuscarora (Monocacy) Tuscarora (Potomac) Tuscarora (Little) Watts Branch Wills Winters Run

Lakes	Artemesia Centennial Deep Creek Elkhorn Bernard Frank Jennings Randolph Kittamaqundi Little Seneca Needwood Quarry Lake Roland Youghiogheny

Reservoirs	Dalecarlia Liberty Loch Raven Piney Run Prettyboy Rocky Gorge Triadelphia

Coordinates: 38°10′N 76°27′W / 38.167°N 76.450°W / 38.167; -76.450

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St. Marys River (Maryland)

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