File:Evitts Creek Aqueduct C and O Canal from above.jpg

English: Pic of canal prism, Evitts Creek Aqueduct near 180 mile mark. NPS site states: The Evitts Creek Aqueduct is the smallest of the aqueducts, constructed in 1840. The arch is segmented with a keystone has arch span clearance of 68'-11". Both granite and limestone are used for the structure, the arch ring is smooth cut and the remaining stone is textured. Although the coursing is mainly regular, some random coursing appears in the spandrals. The low arch rises 13'-4" above the spring line and the 88' face wall is terminated by a 4½ ' wide buttress. The buttress protrudes 4½' before the 23' long wingwalls at a 30° angle in order to help take the thrust of the arch. Walls parallel to the face wall continue from the end of the wings for about 22' to terminate the structure. The interior run of 99½' of aqueduct continues for another 30' at each end with cut stones. These stones angle out at about 30° for another 42' to regain the canal width. The interior aqueduct clearance is 20'°". The towpath wall is 8'-2" wide, and the berm 6' (both including coping overhang of a few inches). The flume of the aqueduct is 7' deep. Both up and down creek faces are similar. The down creek face of the towpath wall had a wrought iron railing, evidenced by holes in the stone that are similar to those for existing railings, but no railing survives.