The lower two rows of stone were chiseled and laid without cement in 1776-1780. The upper concrete row was added in 1895 to make the reservoir larger. The reservoir formerly was the source of Narrows' water supply.
Ralph also helped with explaining all the trees on the hike. These were:
Butternut (White Walnut) Juglans cinerea
American Basswood (Linden, Linn, Beetree) Tilia americana
Sweet Birch (Black Birch, Cherry Birch) Betula lenta
Yellow Buckeye (Sweet Buckeye) Aesculus flava
Besides these trees, we saw sugar and red maples, red and white oaks including chestnut oaks, ash, and other trees. Students learned that because we are located in the middle section of the Appalachians, we get both southern and northern species, resulting in great diversity.
Here is a link to a page containing the map of the trail:
This link has directions to the Mill Creek Nature Park in Narrows, Virginia: