Hi Mcdude,
If you go back and read the thread "Anchoring near a swim platform" you'll find all the legal requirements necessary to get permission to erect a swim line.
If your Lake is a public body of water in the State of New Hampshire, you cannot proceed with your plans without first obtaining the necessary permits from Safety.
I won't bother reposting requirements and the pertininent regulations as they are all contained in the aforementioned thread.
Anyway, click on the thread below to find your answers....
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http://www.winnipesaukee.com/forums/...=7054#post7054