The excerpt from the 4-2-02 city commission minutes below explain how the Coleman Drive signage came to be in Riverside Park.
In the 1st Addition to Parkside there is a street called Park Avenue. There is also a platted street entitled Park Street. On the map below (Pott. County GIS) the road that goes around the ball diamonds is called Ball Park Drive, there is even signage at the southern entrance to the park. However, I have seen documents which refer to that road as Riverside Drive and Riverside Park Drive.
The map below (Google Maps) shows Coleman Drive.