FLOOD03889

• County: Statewide
• Community: Harrison County, Iowa
• Stream Name: Missouri River Miles 651-64905
• Basin: Statewide
• Title: California Bend Habitat Restoration/Preservation Project Volume 1
• Date: 10/1/1994
• Prepared For: US Army Corps of Engineers
• Prepared By: Greenhorne & O'Mara, Inc.
• Floodplain - Doc Type: Project

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TABLE OF CONTENTS (CONTINUED)

Page

d. Alternative D - Backwater/Wetland Complex with Alternate Water Supply 24
e. Alternative E - Alternate Water Supply Only . . . . . . . . . . . . . . . . .. 24
f. Alternative F - No Federal Action ........................ 25

7.

EVALUATION OF ALTERNATIVES. . . . . . . . . . . . . . . . . . . . . . . .. 25
a. Alternative A - Flow-Through Chute Channel and Backwater Area .... 25
b. Alternative B - Flow-Through Chute Channel and Backwater Area
with Alternate Water Supply. . . . . . . . . . . . . . . . . . . . . . . . . .. 25
c. Alternative C - Backwater/Wetland Complex . . . . . . . . . . . . . . . . .. 28
d. Alternative D - Backwater Wetland Complex with Alternate Water Supply 28
e. Alternative E - Alternate Water Supply Only ................. 29
f. Alternative F - No Federal Action ........................ 29
g. Discussion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 29

8.

SELECTED PLAN WITH DETAILED DESCRIPTION . . . . . . . . . . . . .. 30
a. General Description " . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 30
b. Sill Structure ..................................... 30
c. Backwater Area . . . . . . . . . . . . . . . . . . " . . . . . . . . . . . . . . . .. 30

d. Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 30

9.

ENVIRONMENTAL EFFECTS ............................. 31
a. Physiography and Topography . . . . . . . . . . . . . . . . . . . . . . . . . .. 31
b. Water Quality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 31
c. Air Quality ...................................... 31

d. Noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 31
e. Prime Farmland ................................... 31
f. Aquatic Resources .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 33
g. Terrestrial/Wetland Resources . . . . . . . . . . . . . . . . . . . . . . . . . .. 33
h. Threatened and Endangered Species - Biological Assessment ........ 34
L Historic Properties and Archeological Resources . . . . . . . . . . . . . . .. 35
J. Socioeconomic Resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35
k. Recreation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35
I. Aesthetics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35

m. Land Use ....................................... 35
n. Adverse Effects Which Cannot be Avoided . . . . . . . . . . . . . . . . . .. 35
o. Short-Term Use Versus Long-Term Productivity. . . . . . . . . . . . . . .. 35
p. Irreversible or Irretrievable Resource Commitments . . . . . . . . . . . . .. 36

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