Voyage to the bottom of Redfish Lake

A question for Tim Woodward's Ask Tim column

This could be a fitting question for the traditional beginning of boating season, e.g. how deep is Redfish Lake? Has anybody ever mapped the bottom of the lake to great extent and if so, where can interested boaters find such a map? Also, in light of the Viking ship recently discovered at the bottom of Sweden’s largest lake, what sort of interesting ancient archeological artifacts have been unearthed from Redfish’s lake bottom, if any?

Footnote: Discovered this article today on Reddit:

Unlocking the secrets of New York Harbor:
http://nymag.com/news/features/56609/