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Excerpt from Geology Related to Land Use in the Hennepin Region Significant floods on the Illinois River occur about once in 8 years. Floods on the tributary streams generally occur more often. Minor seasonal floods on both the main stem and the tributaries usually develop between February and Iuly, with the greatest number occurring in Iuly (u. 8. Geological Survey, Seasonal floods result in relatively minor damages, except to crops on the low-lying farms along the tributaries. The maximum flood on record on Bureau Creek produced a rise of 13 feet above a datum of 449. 2 feet above mean sea level at the recording station at Bureau (mitchell, The most severe flood of the Illinois River on record occurred in May 1943, when the river rose to 28. 8 feet at Peoria, down stream from Lasalle, and remained above flood stage for 34 days (peterson, 1967, p. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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