Last year was the most successful harvest since 2001.
Many farmers now face dumping old spuds to make way for the new.
Gale Harding of the University of Idaho Ag Extension Office said: "We didn't plant that many more spuds, but because the growing conditions we had that much increased in yields it put us at a surplus.
"The only other alternatives besides feeding the cattle are to take them out and dump them some place and then bury them.
"It's really a hardship on our agriculture because these farmers are receiving pennies on the dollar for all the major investment they had growing their crops."
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