Three test holes drilled at Windigo in Isle Royale National Park in 1981 indicate that the ophitic basaltic lava flows underlying the area contain little water and cannot be considered a source for public water supply. The holes were 135, 175, and 71 feet deep. One hole yielded about 1 gallon of water perminute; 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. (USGS)
RECORD ID: 8400880
F&G CODE: 02f
Publication
Grannemann, N. G., Twenter, F. R., Ground Water for Public Supply at Windigo,
Isle Royale National Park, Michigan: USGS Open-File Report 82-567; 1982. 16 p, 4
Fig, 3 Tab, 5 Ref.
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