Even tho the last date is 1941 - it is sometime before this as State Road 10 is not designated on the plat map as running
east and west as yet - so this map is possibly done just before State Road 10 was commissioned and put in use in 1929.
This is the lake area from the 1920-1941 - Plat Books of Indiana Vol. 1-6; Vol. 4. M-O; Sidwell Studio Lombard, Il.: