Potomac - 1. Mouth of Monocacy to Riley's Lock Boat Ramp

Potomac, Maryland, US/Virginia, US


1. Mouth of Monocacy to Riley's Lock Boat Ramp (Islands of the Potomac WMA - Oxley, Mason and Maddux Islands)

Usual Difficulty I (for normal flows)
Length 19.5 Miles

Gauge Information

Name Range Difficulty Updated Level
usgs-01646500 2.40 - 6.80 ft I 00h21m 4.48 ft (running)

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.

StreamTeam Status: Not Verified
Last Updated: 2018-12-14 19:55:10


Rapid Descriptions

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