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Navigation Pool
4 is 73.3 km (44 river miles) long and includes 14,700 ha
(36,300 acres) of aquatic habitat. It is located between Lock and
Dam 3 (above Red Wing, Minnesota) and Lock and Dam 4 (Alma, Wisconsin).
Major tributaries include the Cannon and Vermillion Rivers on the
Minnesota side and the much larger Chippewa River on the Wisconsin
side. Lake Pepin, a riverine lake created by the Chippewa River
delta, is located in the middle of Pool 4. The location of Lake
Pepin divides the rest of the pool into upper Pool 4 and lower Pool
4. The smaller backwaters of upper Pool 4 have been degraded by
sedimentation, whereas the larger backwaters of lower Pool 4 are
much better habitat for vegetation.
Click on the image for a larger view of Pool 4 |
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Click on the image for a larger view of Pool 8 |
Navigation Pool
8 is 38.8 km (23.3 river miles) long and is bounded
by Lock and Dam 7 (Dresbach, Minnesota) to the north and Lock and
Dam 8 (Genoa, Wisconsin) to the south. It encompasses 9,000 ha (22,100
acres) of aquatic habitat. Major tributaries include the Black,
Root, and La Crosse Rivers. The upper section of Pool 8 has high
bank islands adjacent to the main channel, deep secondary channels,
and backwater sloughs. The middle section contains low islands,
braided channels, and small backwater sloughs. The lower section
is a large open expanse of water.
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Click on the image for a larger view of Pool 13 |
Navigation Pool
13 is 52.1 km (34.2 river miles) in length and is
bounded by Lock and Dam 12 (Bellevue, Iowa) to the north and Lock
and Dam 13 (Fulton, Illinois) to the south. It encompasses 11,400
ha (28,100 acres) of aquatic habitat. Similar to pools upstream,
Pool 13 contains many high bank islands adjacent to the main channel
in the upper section, braided backwater channels and sloughs in
the middle section, and a large open lake-like area in the lower
section of the pool. Major tributaries include the Apple and Plum
Rivers on the Illinois side and Maquoketa and Elk Rivers on the
Iowa side.
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The Navigation Pool
26 study area includes water bodies along the Upper
Mississippi River from Lock and Dam 25 (Winfield, Missouri) to Lock
and Dam 26 (Alton, Illinois) and the lower Illinois River from its
confluence with the Mississippi River north to Illinois River mile
12. This reach of the two rivers is bordered by high bluffs on the
Illinois side and low elevation floodplain on the Missouri side.
The reach encompasses 9,500 ha (23,700 acres) of aquatic habitat.
Presently, most of the backwaters of the lower Illinois River are
isolated from the river by low levees so as to decrease sedimentation
and allow management for waterfowl. Likewise, many of the secondary
channels of the Mississippi River are isolated from the river on
the upstream side to create backwaters and to reduce sedimentation.
Click on the image for a larger view of Pool 26 |
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Click on the image for a larger view of La Grange Pool |
La Grange Pool on the Illinois River is about 130
km (80 river miles) long and encompasses 10,750 ha (26,500 acres)
of aquatic habitat. It is bounded by Peoria Lock and Dam to the
north and La Grange Lock and Dam to the south. This reach has the
highest proportion of backwaters, except for Pool 4, but these backwaters
are highly degraded by excessive sedimentation over the last 150
years. Many backwaters are isolated by low levees to enhance waterfowl
habitat management. Major tributaries include the Sangmon, Mackinaw,
and LaMoine Rivers.
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