MD, WV, DC · Shenandoah basin · HUC 02070003

Potomac River

Running normal

45th percentile
streamflow volume of its normal range
5 gauges reporting
2 below normal
Poor water quality
at each of 2 sampling sites
11,560sq mi drains to the lowest gauge
290.2mi long, head to mouth

upstream ↑

25 mi 50 75 100 125 150 200 225 250 275 Chesapeake Bay South Branch Potomac River 1,480 sq mi North Branch Potomac River 1,343 sq mi SQ MISQ MI 158.3 Town Creek Big Run, 3.5 sq mi Big Run, 3.5 sq mi 109.1 Little Cacapon River Purslane Run, 5.8 sq mi Purslane Run, 5.8 sq mi Dawson Run, 1.4 sq mi Dawson Run, 1.4 sq mi Big Run, 6.4 sq mi Big Run, 6.4 sq mi Steer Run, 1.5 sq mi Steer Run, 1.5 sq mi Rockwell Run, 3.1 sq mi Rockwell Run, 3.1 sq mi 61.8 Fifteenmile Creek 103.9 Sideling Hill Creek Willett Run, 4.6 sq mi Willett Run, 4.6 sq mi Long Hollow Run, 6.6 sq mi Long Hollow Run, 6.6 sq mi 680.5 Cacapon River Sir Johns Run, 8.3 sq mi Sir Johns Run, 8.3 sq mi Grasshopper Run, 0.7 sq mi Grasshopper Run, 0.7 sq mi 25.3 Little Tonoloway Creek 114 Tonoloway Creek Stoney Run, 1.5 sq mi Stoney Run, 1.5 sq mi Ditch Run, 4.8 sq mi Ditch Run, 4.8 sq mi 145.1 Sleepy Creek 212.9 Licking Creek Big Run, 4 sq mi Big Run, 4 sq mi Cherry Run, 9.2 sq mi Cherry Run, 9.2 sq mi Green Spring Run, 3.5 sq mi Green Spring Run, 3.5 sq mi 16.9 Harlan Run Camp Spring Run, 3.2 sq mi Camp Spring Run, 3.2 sq mi 18.1 Little Conococheague Creek Jordan Run, 1.6 sq mi Jordan Run, 1.6 sq mi 568.1 Conococheague Creek Magruder Run, 1.2 sq mi Magruder Run, 1.2 sq mi 344.2 Opequon Creek Downey Branch, 3.2 sq mi Downey Branch, 3.2 sq mi 16.4 Rockymarsh Run 21 Marsh Run 277.6 Antietam Creek 18.8 Elks Run 3,057.7 Shenandoah River 14.9 Piney Run Israel Creek, 13.1 sq mi Israel Creek, 13.1 sq mi 12.9 Dutchman Creek Quarter Branch, 3 sq mi Quarter Branch, 3 sq mi 29.2 Little Catoctin Creek 120.9 Catoctin Creek 92.6 Catoctin Creek 3.7 Washington Run 21.8 Tuscarora Creek 969.5 Monocacy River 18.8 Little Monocacy River 15.6 Limestone Branch 14.7 Broad Run 386.3 Goose Creek 2 Cabin Branch Horsepen Branch, 13.2 sq mi Horsepen Branch, 13.2 sq mi 21.1 Sugarland Run 129.7 Seneca Creek 21.3 Old Sugarland Run 19.5 Muddy Branch Nichols Run, 7 sq mi Nichols Run, 7 sq mi 22.3 Watts Branch Mine Run Branch, 2.6 sq mi Mine Run Branch, 2.6 sq mi 58.3 Difficult Run Bullneck Run, 1.9 sq mi Bullneck Run, 1.9 sq mi Scott Run, 5.2 sq mi Scott Run, 5.2 sq mi Rock Run, 5 sq mi Rock Run, 5 sq mi 2.7 Dead Run Turkey Run, 1.1 sq mi Turkey Run, 1.1 sq mi 25.6 Cabin John Creek Minnehaha Branch, 1.6 sq mi Minnehaha Branch, 1.6 sq mi Little Falls Branch, 7.1 sq mi Little Falls Branch, 7.1 sq mi 12.2 Pimmit Run Gulf Branch, 0.8 sq mi Gulf Branch, 0.8 sq mi Donaldson Run, 1.1 sq mi Donaldson Run, 1.1 sq mi 77.6 Rock Creek Roaches Run, 3 sq mi Roaches Run, 3 sq mi 19.1 Four Mile Run 14.7 Oxon Run 47.4 Cameron Run 69.5 Piscataway Creek Little Hunting Creek, 10.2 sq mi Little Hunting Creek, 10.2 sq mi 18.7 Dogue Creek Pomonkey Creek, 10.4 sq mi Pomonkey Creek, 10.4 sq mi 23.6 Neabsco Creek 98.5 Mattawoman Creek 21.2 Powells Creek Little Creek, 4.8 sq mi Little Creek, 4.8 sq mi 35.9 Chopawamsic Creek Tank Creek, 2.4 sq mi Tank Creek, 2.4 sq mi Mallows Creek, 3.6 sq mi Mallows Creek, 3.6 sq mi 90.8 Aquia Creek 90.3 Potomac Creek Passapatanzy Creek, 12.9 sq mi Passapatanzy Creek, 12.9 sq mi Chotank Creek, 9.4 sq mi Chotank Creek, 9.4 sq mi Popes Creek, 5.2 sq mi Popes Creek, 5.2 sq mi 50.9 Upper Machodoc Creek 16.7 Rosier Creek Monroe Creek, 13 sq mi Monroe Creek, 13 sq mi Bridges Creek, 6.6 sq mi Bridges Creek, 6.6 sq mi 24 Popes Creek 257.3 Wicomico River Big Meadow Run, 7.2 sq mi Big Meadow Run, 7.2 sq mi Mill Run, 5.3 sq mi Mill Run, 5.3 sq mi Jackson Creek, 4.4 sq mi Jackson Creek, 4.4 sq mi 91.3 Saint Marys River Presley Creek, 11.1 sq mi Presley Creek, 11.1 sq mi Cubitt Creek, 8.9 sq mi Cubitt Creek, 8.9 sq mi Hack Creek, 13.1 sq mi Hack Creek, 13.1 sq mi Paw Paw Little Orleans Great Cacapon Hancock Pecktonville Ernstville Big Pool Big Spring Charlton Pinesburg Williamsport Falling Waters Bakersville Mercersville Shepherdstown Antietam Dargan Bolivar Harpers Ferry Sandy Hook Brunswick Point of Rocks Leesburg Lansdowne University Center Countryside Cascades Lowes Island Darnestown Travilah Great Falls Potomac McLean Cabin John Bethesda Glen Echo Brookmont Arlington Washington Alexandria Forest Heights National Harbor Huntington Belle Haven Fort Washington Fort Hunt Accokeek Fort Belvoir Mount Vernon Bryans Road Potomac Heights Indian Head Mason Neck Cherry Hill Triangle Quantico Quantico Base Fairview Beach Dahlgren Dahlgren Center Colonial Beach Cobb Island Tall Timbers Piney Point St. George Island Paw Paw Hancock Shepherdstown Point of Rocks Wash Chain Bridge

downstream ↓

flow gauge selected, chart below water quality site water poor town on the river

Paw Paw

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3,129 sq mi drains to here +18% vs. 7 days ago

The uppermost gauge on this reach. Flow here is above normal for early September.

joins between Paw Paw and Hancock
Unnamed / ungauged inflow~935 sq mi, not measured

Hancock

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4,064 sq mi drains to here +15% vs. 7 days ago

Flow here is low for a typical day of the year. The river collects another 935 square miles of drainage between Paw Paw and here.

joins between Hancock and Shepherdstown
Unnamed / ungauged inflow~1,891 sq mi, not measured

Shepherdstown

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5,955 sq mi drains to here -13% vs. 7 days ago

Flow here is low for a typical day of the year. The river collects another 1,891 square miles of drainage between Hancock and here.

joins between Shepherdstown and Point of Rocks
Unnamed / ungauged inflow~3,696 sq mi, not measured

Point of Rocks

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9,651 sq mi drains to here Water quality poor sampled this month
Water Quality
Point of Rocks
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Flow here is normal for early September. The river collects another 3,696 square miles of drainage between Shepherdstown and here.

joins between Point of Rocks and Wash
Unnamed / ungauged inflow~1,909 sq mi, not measured

Wash

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11,560 sq mi drains to here

The lowest gauge on this reach. Flow here is normal for early September. The river collects another 1,909 square miles of drainage between Point of Rocks and here.

Chain Bridge

mile 118.6 Open full chart
Water quality poor sampled 7 months ago
Water Quality
Chain Bridge
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