The route began at SR 122 in western Eaton, traveled south along Camden Road for about 0.3 miles (0.48 km) before turning into the memorial, looping through the entire site, and ending at itself just south of the route's start at SR 122.

SR 355 headed south on the two-lane Camden Road first past the park exit and then between the park and the Mound Hill Cemetery.

[2] The route was created in 1932 as an unnumbered spur from SR 122 in Eaton to Fort St. Clair State Memorial.

[5] Official state maps prior to 1969 showed the route as a 0.5-mile-long (0.80 km) route, but maps after 1971 showed it as one-mile-long (1.6 km).

[6][7] The short route would not undergo any major changes throughout its history until the park had its jurisdiction transferred from the state to the city in 1992.