Friends of Dyke Marsh is a volunteer group dedicated to preserving, restoring and enhancing Dyke Marsh, a freshwater tidal marsh in Fairfax County on the Potomac River just south of Alexandria, Virginia. The Dyke Marsh Wildlife Preserve is administered by the National Park Service.

What Is Dyke Marsh?

The Dyke Marsh Wildlife Preserve is a freshwater, tidal marsh on the Virginia side of the Potomac River in Fairfax County. It is a unit of the George Washington Memorial Parkway, U.S. National Park Service. For more information, visit the NPS website at

Christmas Bird Count Included Dyke Marsh

Red shouldered hawk

Many FODMers participated in the National Audubon Society’s annual Christmas Bird Count (CBC) in January 2016.  Larry Meade, president of the Northern Virginia Bird Club, gave this report in the club’s February newsletter, The Siskin:

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NVCT Volunteers Tackle Ivy and Trash


On the morning of January 18, 2016, the annual Martin Luther King Day of Service and winter’s coldest day so far, 20 hardy volunteers organized by the Northern Virginia Conservation Trust (NVCT) visited the Dyke Marsh Wildlife Preserve.   Braving temperatures in the high teens and a brisk wind whipping across the river, the group removed English ivy climbing up trees and collected five bags and a plastic crate of trash. 

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Hoping to Repopulate Pumpkin Ash Trees

Pumpkin ash seed

In September 2015, a team from the North Carolina Botanical Garden, working with National Park Service staff and the Friends of Dyke Marsh, collected thousands of pumpkin ash seeds (by the bunch, pictured) from a score of different trees in the preserve.  The team has concluded that the seeds are likely viable and in early 2016, they are drying them for long-term storage. 

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Nature's Exquisite Timing


Among many other accomplishments, Henry David Thoreau and Thomas Jefferson were diligent phenologists.  They kept detailed journals in which they recorded the timing of events in nature -- when trees leafed out, when flowers bloomed, when the ground was warm enough to plant.

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The Sounds of Dyke Marsh

American bullfrog

FODMer Laura Sebastianelli lives on the edge of the western part of the Dyke Marsh Wildlife Preserve, the 26 acres west of the George Washington Memorial Parkway, a place she describes as "rich with natural sounds."

Laura admits to a “natural bias,” meaning she loves the sound of nature.  She wrote, "Now technically nature includes us humans, but I confess my bias is for birds, insects, frogs, toads, mammals, gentle wind blowing through treetop leaves and water lapping at shoreline edges." 

With this playlist, Laura shares some of the wonderful sounds of Dyke Marsh. American bullfrog picture courtesy of Laura Sebastianelli.

FODMers Clean Up Trash


Despite a steady drizzle on November 7, 2015, fourteen FODMers and friends donned their rain gear and cleaned up trash in Dyke Marsh West for almost two hours at low tide.  The group collected eight bags of plastic and glass bottles, metal cans, tennis balls, plastic bags, styrofoam, cardboard and more. 

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Much to See on Fall Colors Walk

Pat Salamone

It was a nippy, overcast day with temperatures hovering in the low 50s, but the FODMers and friends who turned out for the annual fall colors walk were undaunted.  The marsh sported many shades of yellow, orange, red and more and even the plant "skeletons" were interesting, observed FODM walk leader Pat Salamone. The large thorns of the honey locust tree make it a "well-defended" tree, Pat commented (photo).

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The DAR Helps in Dyke Marsh


On October 11, 2015, 29 members of the Nelly Custis Chapter and other chapters of the Daughters of the American Revolution (DAR) turned out in force to help in the Dyke Marsh Wildlife Preserve (photo left by Robert Smith). Under FODM Vice-President Ned Stone's direction, they split into three groups and cleaned the shoreline of an island and the Belle Haven picnic area and took on invasive plants on the dogleg portion of the Haul Road trail.   The eager group collected around 58 bags of trash.  "It makes a difference," wrote FODM Treasurer Robert Smith. 

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Saving Pumpkin Ash Trees

Bob Smith

FODM and the National Park Service (NPS) have undertaken a project to save some of the preserve's pumpkin ash trees  (Fraxinus profunda) from the emerald ash borer (EAB) (Agrilus planipennis), an invasive insect that has been documented in Northern Virginia and will kill all species of ash trees, according to U.S. Department of Agriculture experts. 

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Another Step Toward Restoration

On September 28-29, 2015, National Park Service (NPS) and U.S. Army Corps of Engineers (COE) officials met to begin the design of the restoration of Dyke Marsh under a NPS-COE interagency agreement.  Officials estimate the design phase will take at least 12 months. 

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