Route 422 reopens after 2-month sinkhole repair in Palmyra

(PennDOT)

PALMYRA, Pa. (WHTM) – Route 422 in North Londonderry Township has reopened to traffic after a nearly two-month closure for nearby sinkholes.

The roadway reopened around 3 p.m. Wednesday, according to a PennDOT news release.

The eastbound lane was closed Aug. 29 when a sinkhole in the parking lot of the Palmyra Bowling Center began undermining the highway. When the sinkhole expanded, PennDOT closed the westbound lane on Sept. 6.

PennDOT spokesman Greg Penny said about 260 feet of the roadway was removed and excavated to a depth of about five feet. He said a sinkhole and large void were discovered adjacent to the repair area, below an underground bridge that was built during a sinkhole repair project in 2014.

The void has been filled with cement.

Penny said the contractor then installed a “flexible sinkhole safety net” over the excavated area that includes several alternating layers of geosynthetic material and soil. On top of these layers, the contractor placed eight inches of subbase material and 10-and-a-half inches of asphalt for the new pavement.

PennDOT District 8 Executive Mike Keiser said the repair “makes this stretch of highway safer should sinkholes emerge in the future.”

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