Through-traffic on Route 82 is being detoured over Route 322 and Chestnut Tree Road.
PennDOT says local access on Route 82 will be maintained up to the bridge.
The bridge was closed to traffic Thursday evening after a portion of the bridge wall was found to be damaged.
A 20-foot, 2-1/2 foot high section of the east bridge wall has fallen away from the bridge.
PennDOT bridge engineer Henry Berman says the collapse is apparently a combination of age and years of freezing and thawing.
The bridge was last inspected in July of 2007 and was due for another inspection this summer.
Now, at least one section will have to be rebuilt.
PennDOT estimates it'll be closed for three to four months.
The three-span stone arch structure was built in 1910. The bridge is 42 feet long and 22 feet wide, and carries approximately 6,600 vehicles daily.
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