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Thread: topo map reference icon ??

  1. #1
    Senior Member
    Join Date
    Dec 2010
    Houston Texas

    topo map reference icon ??

    Here is a section from a 1957 topo map of a location I want to get permission to search. Does anyone know what these ovals and hashmarks represent on a topo map????? I tried looking up the symbols for topo maps and didn't see these on the icons. Any map specialsists on here????

    Name:  1957 topo map section.jpg
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  2. #2
    Administrator del's Avatar
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    Oct 2009
    I have never seen symbols like that on any maps I've looked at I hope some can shed some light Robbie .
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  3. #3
    Elite Member Digger_O'Dell's Avatar
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    Jun 2015
    near Milwaukee Wi.
    Because they are in blue, it means water. The lines being dotted means temporary of intermittent. By the looks of the map and the shape, I would think those are ditches or mad made runoff areas that may stay wet for long periods.
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  4. #4
    My guess is wet areas during rainy time of the year.
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