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The bridge originally crossed the Middle Fork Feather River and is the only one of several suspension bridges built in the area in the 1850 s that still remains .
 Middle Fork Feather River
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Middle Fork Feather River