Three test holes drilled at Windigo in Isle Royale National Park in 1981 indicate that the ophitic basaltic lava flows inderlying the area contain little water at depths less than 175 feet and cannot be considered a source for a public water supply. The holes were 135, 175, and 71 feet deep. One hole yielded about 1 gallon of water per minute; the other two yielded less. Glacial deposits seem to offer the best opportunity for developing a ground-water supply of 5 to 10 gallons per minute.
Grannemann, N. G., and Twenter, F. R., 1982, Ground water for public supply at Windigo, Isle Royale National Park, Michigan: U.S. Geological Survey Open-File Report 82-567, 16 p.
Back to Publications List
Back to USGS, WRD Michigan Home Page
U.S. Department of the
Interior, U.S. Geological
Maintainer: Webmaster <firstname.lastname@example.org>
Updated On: Tuesday, September 19, 2000
Privacy Statement || Disclaimer