This photo needs editing.
Difficulty I
Length 19.5 Miles
Flow Range 2.40 - 6.80 FT
Flow Rate as of: 49 minutes ago 2.97 [FT]
Reach Info Last Updated 12/14/2019 4:04 pm

River Description

Islands of the Potomac WMA
Put-in would be at the Monocacy Boat Ramp at the Mouth of Monocacy Park, near Dickerson, MD.   The Long run take-out for this stretch is Rileys Lock boat ramp at the mouth of Seneca Creek, near Poolesville, MD.  On the Maryland side, other river accesses below Mouth of Monocacy and above Rileys Lock are Whites Ferry (6.4 miles below Mouth of Monocacy), Edwards Ferry (11.3 miles below Mouth of Monocacy and Sycamore Landing (15.1 miles below Mouth of Monocacy), all of which are river left and all of which could be a short put-in or take-out.  C&O Canal hiker/biker campgrounds on the Maryland side along this stretch would include:  Marble Quarry campground (4 miles below Mouth of Monocacy and river left channel at Mason Island), Turtle Run campground (7.5 miles below Mouth of Monocacy and river left channel at Harrison Island), Chisel Branch campground (11.5 miles below Mouth of Monocacy) and Horsepen Branch campground (16.3 miles below Mouth of Monocacy and last non-permit campground).  On the Virginia side are Balls Bluff Battlefield Regional Park - Veterans Park Boat Launch (7.7 miles below Mouth of Monocacy  and river right channel at Harrison Island) and Algonkian Regional Park Boat Ramp (17.5 miles below Mouth of Monocacy), both of which are river right.  Difficulty is Class I moving water with the usual possibilities of strainers or shoals and the possibility of getting behind the wrong side of an Island for some of the intermediate access points.
Oxley, Mason and Maddox Islands can be accessed along this Montgomery County, Md Potomac River stretch.  
Oxley Island is located near Dickerson, MD, one mile north of Whites Ferry. This island is approximately 30 acres and is just upstream from Mason Island.
Mason Island is also near Dickerson, MD, about one mile north of Whites Ferry. This island is 275 acres and is just down river from Oxley Island.
Maddux Island is located near Poolesville, MD. It is located between Seldon Island and Tenfoot Island (both privately owned) about 2 miles downstream from Whites Ferry. This 169 acre island is part of the McKee-Beshers WMA and may also be known as Van Deventer Island.
Area Regulations for Potomac Islands
Use of these islands is allowed 7 days a week throughout the year.
Hunting is allowed in accordance with statewide open season dates, bag limits, and shooting hours, unless otherwise noted.
All State, Federal, and Montgomery County Hunting Laws and Regulations are applicable.
No permit is required to access these islands.
Trapping is by permit only.
No motorized vehicles are allowed. 
Access is by boat only.
No roads or trails are maintained on these islands. 
No hunting or trapping is allowed on any islands besides Mason, Oxley, and Maddux.
The islands are open for hiking, nature photography, bird watching, or fishing.
Camping and camp fires are not allowed. 
Visitors should be aware of biting insects, mosquitoes, and ticks.

Rapid Descriptions


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Directions Description

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Upper Yough Access Guidelines and Fundraiser

Charlie Walbridge

At Maryland's Upper Yough, one of the country's finest whitewater runs, American Whitewater has been maintaining the Sang Run Access for the past 20 years. With the 4th of July weekend coming up, a quick reminder that we are guests of the Town of Friendsville when we take out. In addition changing clothes discretely ad behaving respectfully, please observe social distancing during the pandemic. Garrett County has a low infection rate, and a mask when patronizing local businesses is the norm. We are also beginning our annual fundraiser to pay the expenses American Whitewater has at Sang Run. Out goal is $1,000, and we have already received $160. The Fee Box at Sang Run is still closed due to vandalism. We suggest $20 for the full season; $5 for one weekend. Please donate on line, or use the donation jar at the Wilderness Voyageurs shop at the takeout. Please go to and put "Upper Yough Access" in the comment box.

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Don Millard - AW Super Upper Yough Access Volunteer!

Charlie and Sandy Walbridge

American Whitewater super-volunteer Don Millard has been taking care of the Sang Run and Friendsville Access Areas on Maryland's Upper Youghioghenny River for the past several years. This bulds on a 2003 agreement between American Whitewater and Maryland State Parks, which owns the property. This year he rebuilt the change house and porta-pot shelter, set AW's sign back up, filled in potholes, and mowed acres of grass. He not only did the work, he donated the materials and machine time! This work givezs AW strong ties to the community (the place is also a fishing access) and local park managers. Also, thanks to him, boaters are not faced with a $5 access fee at both ends! Please remember, the pandemic is still on. Be smart. If you use the porta-pot, wash your hands or use sanitizer!

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Potomac River Closure for Golfing Officials Sparks Controversy

Kevin Colburn

Several newspapers reported this week that the Coast Guard is proposing to close a portion of a popular section of the Potomac River whenever high-ranking officials are playing golf at Trump National Golf Club. DC area paddlers quickly balked at the proposed new rule and Congressional leaders have joined them in pushing back against the proposal. The Coast Guard has posted their proposed closure rules, and an opportunity to comment online until August 9, 2017. Alternative approaches could allow both public use of the river and secure use of the private golf course.

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Attention Virginia Boaters!

Jason Robertson

During the high waters of Spring 2003, there has been a noticeable increase in reported confrontations between boaters and property owners in Virginia. Please remember to be respectful and courteous to property owners; do not trespass; and avoid confrontation in order to preserve access in the future.

Tony Allred Jr


Revision #Revision DateAuthorComment
1210701 12/14/18 Tony Allred Jr 12-15-2018 - cleanup
1214014 12/11/19 Tony Allred Jr updated description
1214015 12/11/19 Tony Allred Jr updated description
1214022 12/14/19 Tony Allred Jr updated description
1214016 12/11/19 Tony Allred Jr updated description
1214023 12/14/19 Tony Allred Jr updated description
1207842 06/30/17 Tony Allred Jr n/a
1207843 06/30/17 Tony Allred Jr 6-30-2017 - added new Potomac river stretch
1207849 06/30/17 Tony Allred Jr 6-30-2017 - increased length of stretch to be more inclusive
1207851 06/30/17 Tony Allred Jr 6-30-2017 - cleanup
1207852 06/30/17 Tony Allred Jr 6-29-2017 - cleanup
1207853 06/30/17 Tony Allred Jr 6-30-2017 - cleanup
1207854 06/30/17 Tony Allred Jr 6-30-2017 - cleanup
1207855 06/30/17 Tony Allred Jr 4-15-2018 - small edit/cleanup
1210006 07/10/18 Tony Allred Jr 7-7-2018 - cleanup