Complex sentence: Plunketts Creek Bridge No.3 was considered "significant as an intact example of mid- 19th century stone arch bridge construction", and was added to the National Register of Historic Places (NRHP) on June 22,1988.
Split into simpler sentences: Plunketts Creek Bridge No.3 was considered significant as an intact example of stone arch bridge construction from the mid- 19th century. The bridge was added to the National Register of Historic Places (NRHP) on June 22,1988.