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<br />Figures
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<br />2-1. Map showing the upper Mississippi River navigation system..............,..........,.. 4
<br />2-2. Hydrographs at long-term gage stations in each of four river reaches ............,.. 6
<br />2-3, Upper Mississippi River hydrographs................,..,.._......................................,... 7
<br />2-4. Plan fonn views of the Illinois River floodplain near Havana, Illinois. in
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<br />1912 and 1960,................,.................................."..........,......,......,...................... 12
<br />2-5, Cross-section diagram of the upper Mississippi River navigation system
<br />illustrating changes to water-surface elevation..............,......,............................. 14
<br />2-{i, Predam (1891) and postdam (1989) land-coverlland-use maps of the Pool 8
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<br />reach.......,........ ....,.............".......... ......... ........,..,.........." ..,......,..., ,.. ..... ,....,......... 15
<br />2-7, Profiles and diagrams showing water-level response under three levels of
<br />control.......,.......... ........,.. ,................,........,........,.. ..... ..............".. ........... ,... ,....... 16
<br />2-8. Annual hydrographs during a drought year (1989) and two "nonnal" years
<br />(1990. 1991) for upper and lower poollneations in upper Mississippi River
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<br />system Pool 26 ........................,.................",.........,..................................'.......... 17
<br />2-9, Diagram showing riverbed elevations through time at Mississippi River mile
<br />366 (Pool 19).................,............"......,....,................................".... ........,..,..""... 18
<br />2-10, Maps showing the Illinois River levee districts between Peoria. Illinois. and
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<br />Grafton. Illinois ,...... ........... ,................... ............,.... ........, ,.............. ,.......... ......... 20
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<br />3-1. Cross-section diagrams of the Mississippi floodplain at river mile 58 of the
<br />open-river reach in the presettlement era and at presen!..........,......,.................., 30
<br />3-2. Cross-section diagrams of the Mississippi floodplain at river mile 218 of an
<br />impounded reach in the presettlement era and at present ....,..,.......................,.., 31
<br />3-3. Diagrams showing four common river categories in the upper
<br />Mississippi River....".. ,...,...... ,............... ..........,.......... ,....... ............ ......,...... .......' 31
<br />3-4. Natural and modified hydrologic patterns and floodplain diagrams at river
<br />mile 58 of the open-river reach of the Mississippi River....,..,............................ 32
<br />3-5. Natural and modified hydrologic patterns and floodplain diagrams at river
<br />mile 218 of an impounded river reach of the Mississippi River .................,..,.... 32
<br />3-{i, Maps showing changes in land coverlland use. Pool 26. upper
<br />Mississippi River. 1891-1989.........................................,......,..................,........, 37
<br />3-7, Maps showing changes in land coverlland use, open-river reach. upper
<br />Mississippi River. 1891-1989............................................._....,....,..................... 38
<br />3-8, Graph showing changes in forest age structure on the Missouri River
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<br />floodplain ,.. ...... ............,.. ................................. ................... ,........ ...... ......,.......... 39
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<br />5-1. Diagram showing idealized changes in water level over an annual cycle for a
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<br />riverine floodplain,.... ,............... ,....... ,.... .............,......,...."............ ............... ....... 50
<br />5-2, Diagrams showing hypothetical examples of river stage and temperature
<br />relations for a large temperate river floodplain...................,............................... 51
<br />5-3. Map of the Missouri River basin showing most of the civil works projects
<br />completed by the U.S. Anny Corps of Engineers and U.S. Bureau of
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<br />Reclamation ............. .._..,...........,....... ...................... ....,.... ,........ .......................... 52
<br />5-4. Hydrographs showing mean, maximum, and minimum stages of the
<br />preregulated and postregulated Missouri River at Omaha. Nebraska.......,..,...... 52
<br />5-5, Graph showing mean annual turbidities of the Missouri River detennined
<br />from daily measurements at the SI. Louis water-treatment facility.................... 56
<br />5-{i, Graph showing number of commercial fishers from the Missouri River,
<br />Missouri. and their reported harvest of all fish species and catfish species.
<br />1945-1990.................. ,..................... ......... ........,.......,....'.. ,............ .......... ..,... ,.... 62
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