You asked where Calamity Corner is, and I (meaning the other people in the newsroom who have lived here longer than 5 years) have found it for you!
Calamity Corner was located at the junction of “the Wilmont diagonal and Highway 16.” The “Wilmont diagonal” is Diagonal Road, and Old Highway 16 is Nobles County 35.
So! This is Calamity Corner today. It is a four-way stop, and I drive through it often