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603963

THE MIDDLE AND UPPER MISSISSIPPI RIVER

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Description of Middle and Upper Mississippi River.

Mileage system-origin..

Physical Characteristics:

Length and fall of stream-Lake Itasca to Gulf of Mexico...

Approximate Mississippi River discharges-Coon Rapids Dam to

Thebes, Ill --

Flood seasons and duration of floods..

Current velocities in channel..

Navigation season.

Low water and navigable depths.

Improvement by the United States for navigation of the Middle and

Upper Mississippi River.--.

War Department supervision.

History of improvement..

Headwater projects—improvements above Minneapolis_

Connecting waterways-descriptions -

Maps and charts—offices where other maps are available

Harbors of refuge----

Fueling facilities.

Drydocks, marine ways, and boat repairs.--

River terminals:

Mississippi River, Ohio River to Minneapolis

St. Croix River..

Black River

Regulations:

To govern the use, administration, and navigation, Mississippi River

and tributaries above Cairo, Ill.

To govern the display of signals.

Drawbridges---

Extracts from pilot rules -

Navigation charts and descriptive matter.

General map-

Index to charts..

Notes and legend.
Charts, Mississippi River, Ohio River to Minneapolis, Minn.

Charts, St. Croix River, mouth to Stillwater, Minn.

Profile sketches. -

Features of locks and dams—table.

Lock and dam sketches.

Bridges—table:

Mississippi River, Ohio River to Minneapolis, Minn..

St. Croix River, mouth to Stillwater, Minn..

Bridge sketches:

Mississippi River, Ohio River to Minneapolis, Minn-

St. Croix River, mouth to Stillwater, Minn.-

Aerial crossings-

Important gauges:

Middle and Upper Mississippi River.

Tributary streams.

Mileage tables.-

Mississippi River, Minneapolis, Minn., to Lake Itasca.

Minnesota River.

Illinois and Mississippi Canal.

Illinois Waterway, Mississippi River to Lake Michigan.

Missouri River, mouth to Sioux City, Iowa --

Index...

THE MIDDLE AND UPPER MISSISSIPPI RIVER

DESCRIPTION

Mississippi River rises in the vicinity of Lake Itasca in central Minnesota and flows in a general southerly direction about 2,450 miles (measured along the natural channel) to the Gulf of Mexico. The section described in detail in this publication extends from the mouth of Ohio River near Cairo, Ill., to Minneapolis, Minn. The section between the Ohio River and the Missouri River (195.0 miles) is referred to as the Middle Mississippi River, while the section above the Missouri River is known as the Upper Mississippi River. The river is improved for barge navigation below the lower Northern Pacific Railway bridge at Minneapolis (853.0 miles above Ohio River), and extension of the improvement to surmount the Falls of St. Anthony and extend through navigation to the Soo Line Railway bridge (857.6 miles above Ohio River) has been authorized by Congress. Between Minneapolis and Alton, Ill. (202.9 miles above Ohio River) the navigation improvement is by means of locks and dams. Below Alton the improvement is made by channel dredging and open-river regulating works.

MILEAGE SYSTEM

Mileages are measured along the centerline of the 1931 steamboat channel, and are stated in terms of miles above the Ohio River, the zero of the mileage system being the intersection of the thalwegs of the Ohio and Mississippi Rivers. Attention is invited to the fact that the mileage systems used in navigation charts of the Ohio and Lower Mississippi Rivers have slightly different origins, the former opposite Cairo Point and the latter at Cairo gauge, about 1 and 2 miles, respectively (along the Ohio River channel), above the intersection of thalwegs. For the convenience of those who prefer to use miles from Minneapolis a column of mileages measured from the lower Northern Pacific Railway bridge at Minneapolis is also shown.

PHYSICAL CHARACTERISTICS The more important physical characteristics of the Mississippi River are outlined in the following tables:

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