 Upon intersecting Yellow Springs Road just east of the Knox Covered Bridge over the Valley Creek, the route turns north and enters Upper Merion Township in Montgomery County and winds north through forested areas along the east bank of the creek.PA 252 comes to its northern terminus at an intersection with PA 23 near the community of Valley Forge.In 1683, the Court of Chester County (which then included present-day Delaware County) approved the construction of "Providence Great Road", which included the route of present-day PA 252 from the southern terminus to north of Media.