Postcard view of Oconomowoc Lock
Oconomowoc, WI
Lock appears to be of timber crib design and is to the left of the dam.

The marine railway that preceded the Oconomowoc Lock
Oconomowoc, WI

Google Earth view of N. Main Street, Oconomowoc, WI

1885 map of Ocomonowoc, WI noting the lock.
Notice the steamboats approaching it.