Pennsylvania Route 866
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| PA Route 866 |
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| Length: | 22 mi[1] (35 km) | ||||||||||||
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| Formed: | 1928 | ||||||||||||
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| North end: | |||||||||||||
| Counties: | Bedford, Blair | ||||||||||||
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Pennsylvania Route 866 is an 22 mile long state highway located in Bedford, Blair counties. The southern terminus is at PA 36 in Woodbury. The northern terminus is at US 22 in Catharine Twp. The road between Martinsburg and Williamsburg is a narrow, notorious stretch of up-and-down dips.

