The arboretum at Tridelphia Reservoir was created during late 2015 and early 2016 and is located along the Pig Tail Trail. It was created by Eagle Scout Connor Bruce and was made possible by the help and support from the Washington Suburban Sanitary Commission, the Maryland Urban and Community Forest Committee, the Howard County Forestry Board, and Boy Scout Troop 649. 

Along a 3/4 mile hike from a parking lot to a beautiful cove 20 different species of trees are identified and signed with Arbor Tags. Three trees are located in the parking lot and the rest are along the trail. These trees support the ecosystem of the Tridelphia Reservoir by providing food for squirrels and whitetail deer and shelter for birds. They also contribute to the quality of the 800 acres of land and 21 billion litres of water by slowing and filtering the water that enters the reservoir.

Trees at Tridelphia Reservoir

Each tree below is linked to its Arbor Tag which describes the distinguishing features of the species. Those pages can be used to make your own laminated tree tags. 

American Chestnut Castanea dentata
American Hornbeam Carpinus caroliniana
American Sycamore Platanus occidentalis
Black Gum Nyssa sylvatica
Black Willow Salix nigra
Boxelder Acer negundo
Eastern Red Cedar Juniperus virginiana
Flowering Dogwood Cornus florida
Hazel Alder Alnus serrulata
Mountain Laurel Kalmia latifolia
Northern Red Oak Quercus rubra
Persimmon Diospyros virginiana
Pignut Hickory Carya glabra 
Pin Oak Quercus palustris 
Red Maple Acer rubrum 
River Birch Betula nigra 
Sassafras Sassafra albidum 
Tulip Tree Liriodendron tulipifera 
Virginia Pine Pinus virginiana 
White Oak Quercus alba 


The Pig Tail Trail area is located near the intersection of Green Bridge Road and Tridelphia Mill Road in Howard County. Visit Google Maps for directions.