In 1922, a deep well was drilled for the City of Davenport by the McCarthy Well Company of St. Paul, Minnesota. The log of the well was a follows.
Proceedings of the Iowa Academy of Science
©1927 Iowa Academy of Science, Inc.
Lindly, J. M.
"Davenport's Deep Well,"
Proceedings of the Iowa Academy of Science, 34(1), 247-247.
Available at: https://scholarworks.uni.edu/pias/vol34/iss1/61