Björnavad Bridge has a dual function. Besides being a crossing, it also serves as a secondary retaining embankment, in the case that Lake Roxen should overflow. The primary retaining embankment is located in Norsholm. In 1867 the Norsholm Dam was very close to rupturing. If it had, the river Motala Ström would probably have a different course today.
(von Röök, 1774).
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