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p. 454.

2

Chief of Engineers Report 1875, part II,

Investigation and survey for 414 to 6-foot channel.

St. Anthony Falls to Grafton, I. Wing dams,

revetment, and scraping. Chief of Engineers Report 1882, p. 1605, Ма 3, 1881 Ohio River to St. Louis, Mo. 8-foot channel by p. 2762, p. 2780.

Aug. 2, 1882 means of wing and closing dams and revetment
July 5, 1884 progressing downstream from St. Louis. Ap-

proved by letter, Chief of Engineers, Mar. 31,

1881 (H. Doc. 50, 61-1, p. 11).

Aug. 2, 1882 West St. Paul, Minn. Dredging. Chief of Engineers Report 1889, p. 1751. Sept. 19, 1890 Rock Island rapids. Widen, straighten, build

dams, dredge. June 3, 1896 Cairo, Ill., to St. Louis, Mo. Dredging for 9-foot

channel 250 feet wide. 58 2 H. Doc. 168

Mar. 3, 1905 Ohio River to Missouri River. Contraction

works and shore protection are practicable, but a 3-year trial of dredging is recommended to

see if it is not the more economical. 59 2 H. Doc. 341

Mar. 2, 1907 Missouri River to St. Paul, Minn. Regulating

works and dredging, 6-foot channel. June 25, 1910 1881 project readopted. Regulating works and

dredging: 8- by 200-feet, Ohio River to St. Louis,

Mo.; 6-seet, St. Louis to Missouri River, 63 2 H. Doc. 628

Rock Island, Ill., to Cape Girardeau, Mo. Navi

gation, power, flood control (cooperative). Mar. 3, 1925 Northern boundary of St. Louis, Mo., to Minne

apolis, Minn. 6- by 200-foot channel. 69 2 H. Doc.

Jan, 21, 1927 Ohio River to northern boundary of St. Louis,

Mo. 9. by 300-foot channel. 70 1 H. Com. Doc. 12..

July 3, 1930 Northern boundary of St. Louis, Mo., to Grafton,

Ill. 9. by 200-foot channel. 70 2 H. Doc. 24.

do. Minneapolis, Minn. 6-foot turning basin at

elevation 743.5 Cairo Datum.

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In addition to the 9-foot project below Minneapolis, Federal projects are in force for maintenance of a navigable channel between

Brainerd and Grand Rapids, Minn., 146 and 323 miles, respectively, above the head of the authorized improvement at Minneapolis, and for operation and maintenance of a group of six reservoirs formed by dams at the outlets of natural lakes on the Mississippi River and tributaries. The improvement between Brainerd and Grand Rapids has been recommended for abandonment, H. D. 467-69–1.

Pertinent data regarding the six headwater reservoirs are listed in the following table:

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CONNECTING WATERWAYS Navigable waters connecting with the Middle and Upper Mississippi River are briefly described below:

Minnesota River.-Rises in Big Stone Lake, Minn. and S. Dak., and flows southeasterly about 224 miles to Mankato, Minn., thence northeasterly about 108 miles to join Mississippi River at mile 844.0 opposite St. Paul, Minn. Existing project for navigation improvement provides for a depth of 4 feet from Mississippi River to Shakopee (25.6 miles) to be obtained by open-river improvement. From the mouth to Savage (13.7 miles) a channel has been dredged by local interests to provide 9-foot depth and a width of 100 feet, except for a restriction to a width of 74 feet at the C. M. St. P. & P. R. R. Bridge (mile 1.7). This reach is being maintained by local interests as needed by them and full depth and width are therefore uncertain. From Savage to Shakopee, minimum channel width is about 50 feet and controlling depths are about 3 feet. Controlling horizontal clearance from the mouth to Shakopee (mile 25.1) is 74 feet and vertical clearance is 55.7 feet (aerial wire crossing). Drawbridges must be given 24 hours' notice for passage of large craft. See table of mileages on pages 302 and 303.

St. Croix River.-Rises in northwestern Wisconsin and flows southerly about 164 miles to join Mississippi River at Prescott, Wis., mile 811.3. Existing project provides for a depth of 9 feet from Mississippi River to the upper limits of Stillwater, Minn. (24.5 miles) in connection with the upper Mississippi River canalization improvement, and depth of 3 feet from the upper limits of Stillwater to Taylors Falls, Minn. (28 miles). Bridges are adequate for tow-boat service to Stillwater with a minimum fixed clearance of 49.1 feet above high water. Channel from Stillwater to Taylors Falls is suitable for small boats. Certain drawbridges in this reach must be given 24 hours' notice to open for large craft. Charts from the mouth to

Wisconsin-Fox Rivers to Green Bay, Wis.-A possible route for small boats between Mississippi River and Lake Michigan at Green Bay exists via Wisconsin River to Portage, Wis. (116 miles) canal with locks between Wisconsin and Fox Rivers at Portage, the canalized Fox River, Portage to De Pere (156 miles) and the improved Fox River from De Pere to Green Bay (7 miles). The Wisconsin River portion of the route is not improved and navigation may be quite difficult and hazardous due to tortuous channel, shifting nature of the stream bed, and high current velocity. A lock, 35 feet wide and 139 feet long, usable size, provides passage through the Prairie du Sac dam, about 26 miles below Portage, Controlling bridge clearances are 42 feet horizontally (C. M. St. P. & P. R. R. at Lone Rock, Wis., mile 55.0) and 1.1 feet vertically above high water or 20.8 feet above low water (C. B. & Q. R. R. at Prairie du Chien, Wis., mile 1.4). Bridge regulations made applicable to the Wisconsin River by approval of the Secretary of War, April 24, 1944, provide that whenever a vessel, unable to pass under a closed bridge, desires to pass through the draw, advance notice of at least 48 hours of the time the opening is required shall be given to the authorized representative of the owner or agency controlling the bridge. The connecting canal at Portage has a width of 70 feet and a controlling depth of 2 feet. The lock at the upper end of the canal is 35 feet wide and 146 feet long and the lock at the lower end is 34.7 feet wide and 137 feet long. The existing projects for the Fox River from Portage to Green Bay provide for depths of 4 feet from Portage to Montello (31 miles), 6 feet from Montello to De Pere, and 18 to 22 feet from De Pere to Green Bay. The project on the upper Fox River from Portage to 12 miles above Lake Winnebago (95 miles) is incomplete, and present controlling depths may be as little as 2 feet at low water. Project depths are available for the remainder of the distance to Green Bay. Locks on the canalized portion of the river vary in width from 34.5 feet to 36.6 feet and in length from 137 feet to 148.6 feet. Controlling bridge. clearances in these reaches of the Fox River are 35.4 feet horizontally and 3.2 feet vertically above standard low water.

Illinois and Mississippi Canal.-Extends about 75 miles from Mississippi River, at the mouth of Rock River, about 3 miles below Rock Island, Ill., to the Illinois River at mile 210.2, near Hennepin, Ill., via lower portion of Rock River and artificial canal. A navigable feeder canal extends 29 miles from Rock River at Rock Falls, Ill., to summit level of the main canal, about 28 miles from Illinois River. There are 32 locks on the Rock River and main canal section of the waterway and a guard lock at the head of the feeder canal near Rock Falls. Existing project provides for a depth of 7 feet. Controlling lock dimensions are 35 by 143 feet and minimum fixed vertical clearances over the main and feeder canals are about 16.4 and 12 feet, respectively. See mileage table on pages 303 to 305.

Illinois Waterway.- Extends from Mississippi River at Grafton, Ill., mile 218.0, to Chicago, Ill., with connections to Lake Michigan at Chicago and Calumet Harbors. The route includes the following waters: Illinois River, mouth to Des Plaines River, 273 miles; Des Plaines River, mouth to Lockport, 18 miles; Chicago Sanitary & Ship

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Canal, Chicago River and branches from Lockport to Chicago Harbor; and Chicago Sanitary Canal, Sag Channel, Little Calumet and Calumet Rivers from Lockport to Calumet Harbor. Total distance from Grafton to Chicago Harbor 327.2 miles; to Calumet Harbor 333.4 miles. (See mileage table on pages 306 to 325.) Project for improvement provides for depth of 9 feet with widths of 300 feet from mouth of Illinois River to Lockport, about 160 to 200 feet in Sanitary Canal and Chicago River, 60 feet in Sag Channel, and 300 feet in Čalumet River System. There are seven locks 110 by 600 feet on the Illinois and Des Plaines Rivers and the Sanitary Canal, one lock 50 by 360 feet on the Sag Channel at Blue Island, Ill., and one lock 80 by 600 feet at Chicago Harbor. Bridges are suitable for river towboats below Lockport, but low bridges above Lockport require specially constructed low clearance towboats. Controlling fixed bridge clearances over several sections of the Illinois Waterway route are outlined below:

1

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Missouri River.-Rises in southwestern Montana, and flows generally southeasterly about 2,500 miles to join the Mississippi River at mile 195.0, just above St. Louis, Mo. The authorized projects for improvement from the mouth to Sioux City, Iowa, to provide for a channel of 6-foot depth and 200-foot width by open-channel control structures and maintenance of minimum flows by controlled discharges from the Fort Peck Reservoir at about mile 1,869, were about 96 percent complete for the section below Kansas City and 91 percent complete for the section above Kansas City at the time all improvement work was curtailed in the interest of the war effort. Despite some deterioration of the channel due to work curtailment, channel depths of at least 6 feet are maintained throughout the navigation season from the mouth to Kansas City. However, channel depths of not more than 4% feet prevail at some localities above Kansas City during periods of low flow. The River and Harbor Act of March 2, 1945, modifies the existing project to provide for a channel of 9-foot depth and 300-foot width. Work on the project was resumed in July 1945. The final attainment of a channel of project dimensions is dependent on the rate of future appropriations. Bridges are adequate for navigation. There are no locks ard dams. A partial table of mileages is shown

on pages 326 to 328. Charts are available through Missouri River Division Engineer Office. (See address on

p. 11).

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Ohio River.-Rises in Pennsylvania and flows southwesterly to join the Mississippi River near Cairo, Ill. (Mile 0 of middle and upper Mississippi mileage system.) Improved by locks and dams to provide a 9-foot depth to Pittsburgh, Pa. (981 miles) and above via Monongahela and Allegheny Rivers. Locks 110 by 600 feet below Pittsburgh. Bridges adequate for river towboats. Navigation charts are published in book form by Ohio River Division, Corps of Engineers, War Department. (See address on p. 11.)

Lower Mississippi River.-Flows southerly about 986 miles (navigation channel distance) from Cairo, Ill., to the Gulf of Mexico. There are no locks and dams. Depth of 9 feet is available from Cairo to Baton Rouge, Louisiana, except during occasional short periods of extreme low water. Depth of 35 feet is available from Baton Rouge to the Gulf of Mexico, and this section is extensively used by oceangoing vessels. Connection is made at Plaquemine, La., and New Orleans, La., with the intracoastal waterway to points westerly along the Gulf coast, and at New Orleans to points easterly. Charts are published by the Mississippi River Commission. (See address on

p. 11.)

MAPS AND CHARTS

Descriptive lists of available maps and charts and other information concerning the Mississippi River and its tributaries above Ohio River (except Missouri River and the Illinois River above La Grange Dam, mile 80.2) may be obtained upon request addressed to the district engineer offices listed on page 5 or to the Division Engineer, Upper Mississippi Valley Division, Corps of Engineers, War Department, 735 U. S. Courthouse and Customhouse, St. Louis 1, Mo. Requests for information should be as specific as practicable and, if maps for purposes other than navigation are desired, should indicate the purpose and the general nature and approximate scale of map desired.

Similar information concerning connecting waters may be obtained upon request addressed to the following offices:

Illinois Waterway.

Mouth to La Grange Dam, mile 80.2-Upper Mississippi Valley Division as listed above, or District Engineer, Corps of Engineers, War Department, 826 U.S. Courthouse and Customhouse, St. Louis 1, Mo.

Above La Grange Dam, mile 80.2—Division Engneer, Great Lakes Division, Corps of Engineers, War Department, 1660 East Hyde Park Boulevard, Chicago 15, Ill.

Missouri River.-Division Engineer, Missouri River Division, Corps of Engineers, War Department, Farm Credit Building, 206 South Nineteenth Street, Omaha 1, Nebr.

Ohio River.-Division Engineer, Ohio River Division, Corps of Engineers, War Department, U. S. Post Office and Courthouse Building, Room 536, Cincinnati 1, Ohio.

Mississippi River between Ohio River and Gulf of Mexico.President, Mississippi River Commission, P. O. Box 80, Vicksburg, Miss.

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