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Difficulty I
Length 19.5 Miles
Flow Range 2.40 - 6.80 FT
Flow Rate as of: 39 minutes ago 2.97 [FT]
Reach Info Last Updated 12/14/2018 7:55 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.  Other river accesses below Mouth of Monocacy and above Rileys Lock are Whites Ferry, Edwards Ferry and Sycamore Landing, all of which are river left and all of which could be a short put-in or take-out.  Difficulty is Class I moving water with the usual possibilities of strainers or shoals.
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


Gage Descriptions

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Directions Description

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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
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
1210701 12/14/18 Tony Allred Jr 12-15-2018 - cleanup