Page 75, line 22 from bottom, insert after "below" except at Commerce, Mo. Page 78, line 24 from bottom, for "starting" read starling. Page 78, strike out last two lines and insert cluding the triangular ends, these are 6 feet at the up-stream end and 4.8 feet at the down stream. The up-river triangular nose is of 3-inch oak as to " waled Page 79, line 12 from top, for walled" read Page 84, line 23 from top, for "the" to a. one built. 'group" read groups. "axis" read axes. and required" read and that I required. "which is " read which island is. ; at end of line. Page 111, line 23 from bottom, strike out period after "chords" and insert comma. Page 139, line 26 from bottom, for "if the " read of the. read Kulenburg. Page 141, line 8 from top, strike out period after "have been provided" read have provided. Page 212, table, Ist column, strike out decimal points before 3 and 4. Page 229, line 22 from top, for "Lake Pekin" read Lake Pepin. From " The case of Mollie Mohler," &c., on page 190 to "Decree affirmed" on page 193, is a quotation. CONTENTS. CHAPTER I. PREFATORY. Origin and nature of this investigation-References: to Chapter II, on the formation CHAPTER II. VALLEY OF THE MINNESOTA RIVER AND OF MISSISSIPPI RIVER TO Definition of the term valley-Prominent natural features and length-General maps CHAPTER III. GENERAL PRESENTATION OF REQUIREMENTS AND ADVANTAGES OF Preliminary remarks-How steamboats are constructed-Necessity for high pilot- Page 68, line 18 from bottom, for "upon grillage" read upon a grillage. Page 75, line 22 from bottom, insert after "below" except at Commerce, Mo. Page 78, strike out last two lines and insert cluding the triangular ends, these are 6 feet at the up-stream end and 4.8 feet at the down stream. The up-river triangular nose is of 3-inch oak Page 79, line 12 from top, for walled" read waled Page 79, line 22 from top, strike out "as to " at end of line. Page 79, line 8, from bottom, change "West" to East. Page 83, line 5 from bottom, for "foundations" read foundation. "and required" read and that I required. Page 111, line 23 from bottom, strike out period after "chords" and insert comma. Page 123, line 25 from top, strike out ; at end of line. 'bottom of" read bottom to. Page 123, line 26 from top, for "they' read They. Page 127, lines 21 and 22 from top, strike out "the sides above are of oak timber, below low water mark." Page 131, line 13 from top, for Kinlenburg" read Kulenburg. read of the. same." and insert comma, Page 139, line 26 from bottom, for "if the" "expensive" read extensive. "will be" read is. 'to me." insert (see Diagram 5.) "pecular" read peculiar. Page 151, line 29 from top, for " "have been provided" read have provided. 'bed one" read be done. "assistant" read assistants. "Saint Clair" read Saint Croix. "up or" read up and. Page 212, table, Ist column, strike out decimal points before 3 and 4. read spent two days. Page 217, line 16 from bottom, for "set of current observations taken" read set of current observations was taken. "Congress" read the Legislature of Minnesota. Page 229, line 22 from top, for “Lake Pekin” read Lake Pepin. The case of Mollie Mohler," &c., on page 1901 to "Decree affirmed" on page 193, is a quotation. CONTENTS. CHAPTER I. PREFATORY. Origin and nature of this investigation-References: to Chapter II, on the formation of the Mississippi Valley and depth of " bed-rock"; to Chapter III, a general presentation of Western river navigation, with discussion of the question of "headway"; to Chapter IV, descriptions of the bridges on the Mississippi; to Chapter V, a history of bridging the navigable Western rivers; to Chapter VI, an account of surveys made, &c.-CONCLUSION RELATIVE TO THE PROPER KIND of bridge. CHAPTER II. VALLEY OF THE MINNESOTA RIVER AND OF MISSISSIPPI RIVER TO THE JUNCTION OF THE OHIO-ITS ORIGIN CONSIDERED-DEPTH OF THE BED-ROCK. Definition of the term valley-Prominent natural features and length-General maps prepared for publication-Method of considering question of depth of bed-rock— Explanation of the cause of Lake Pepin and similar lakes-Valley now filling upRecent drainage of Lake Winnipeg southward-Valley formed since the glaciers began to retire-How the valley was formed-Anomalies of Rock Island Rapids and Des Moines Rapids-Loess formation-Formation of rapids since the Loess-Summary of principal points presented-Explanatory hypotheses-Approximate practical conclusion Sections of best known parts of valley in regard to depth of bed-rockContour map of the sources of the Mississippi-Table of areas of basins drained by the tributaries to the valley. CHAPTER III. GENERAL PRESENTATION OF REQUIREMENTS AND ADVANTAGES OF WESTERN RIVER NAVIGATION-NECESSITY FOR WIDE CLEAR SPANS AND HIGH BRIDGES; AND A DISCUSSION OF THE DATA ON UPPER MISSISSIPPI FOR DETERMINING HEADWAY UNDER BRIDGES. Preliminary remarks-How steamboats are constructed-Necessity for high pilothouses-Height of chimneys-Table of dimensions of steamboats-Barge transportation-Rafting-General remarks-Knowledge of varying stages important-Gauge data used-Gauge observations at Saint Louis and Rock Island compared for a period of sixteen years-Gauge observations at Saint Louis, Quincy, and Rock Island compared for a period of eight years-Headway under bridges-1st. Saint Louis tables, &c.-2d. Rock Island tables, &c.; comparison of conditions at Saint Louis and Rock Island with regard to headway-3d. Quincy tables, &c.; comparison of conditions at Saint Louis and Quincy with regard to headway-4th. Dubuque tables, &c.; comparison of conditions at Saint Louis and Dubuque with regard to headway-5th. Other places on the Mississippi where gauge observations have been made-General rule for equating headway at places having different ranges from high to low water-Table of ranges from low to high water on the Mississippi, Ohio, and Missouri Rivers. Introductory remarks-Outline of treatment of each bridge-SAINT PAUL RAILWAY DRAW-BRIDGE-SAINT PAUL ELEVATED HIGHWAY BRIDGE-HASTINGS RAILWAY DRAW-BRIDGE-WINONA RAILWAY DRAW-BRIDGE-LA CROSSE RAILWAY DRAW- BRIDGE-PRAIRIE DU CHIEN PONTON RAILWAY DRAW-BRIDGE-DUBUQUE RAILWAY DRAW-BRIDGE-CLINTON RAILWAY DRAW-BRIDGE-ROCK ISLAND RAILWAY HIGHWAY DRAW-BRIDGE-BURLINGTON RAILWAY DRAW-BRIDGE-KEOKUK RAILWAY AND HIGHWAY DRAW-BRIDGE-QUINCY RAILWAY DRAW-BRIDGE-HANNIBAL RAIL- WAY AND HIGHWAY DRAW-BRIDGE-LOUISIANA RAILWAY DRAW-BRIDGE-SAINT LOUIS ELEVATED RAILWAY AND HIGHWAY BRIDGES-BRIDGES ON THE MISSISSIPPI BETWEEN SAINT PAUL AND SAINT LOUIS, AUTHORIZED BUT NOT BUILT. GENERAL HISTORY OF BRIDGING THE NAVIGABLE WESTERN RIVERS HISTORY OF THE BRIDGE ACROSS THE OHIO AT WHEELING-HISTORY OF THE FIRST BRIDGE ACROSS THE MISSISSIPPI AT ROCK ISLAND ABSTRACT OF DEBATES IN CON- GRESS PRECEDING THE AUTHORIZATION OF BRIDGES ACROSS THE MISSISSIPPI RIVER- ABSTRACT OF DEBATES IN CONGRESS LEGALIZING THE BRIDGE ACROSS THE MISSIS- SIPPI AT CLINTON-HISTORY OF BRIDGING THE MISSISSIPPI AT SAINT LOUIS-QUOTA- TIONS FROM DECISIONS OF THE UNITED STATES SUPREME COURT FOR INJURIES SUS- TAINED AT THE SAINT PAUL RAILWAY DRAW-BRIDGE--MEMORANDUM UPON BRIDGING THE OHIO RIVER SUBSEQUENT TO THE WHEELING BRIDGE CASE-MEMORANDUM UPON MISSOURI RIVER BRIDGES—ABSTRACT OF LAWS FOR BRIDGING THE OHIO, MIS- Description of the surveys made in 1866, '67, '68, '69, and '76-Circumstances under which the maps and report were prepared-LIST AND DESCRIPTION OF ORIGINAL MAPS-COMPILED MAPS ON A SCALE OF TWO INCHES TO A MILE-Map on a scale of an inch to six miles-LIST OF MAPS COLLECTED AND USED IN THE COMPILATION. LIST OF ILLUSTRATIONS. (1) For pages in the text: Diagram A, Mississippi River Valley from the Ohio to the Gulf of Mexico. Diagram B. Mississippi River Basin, showing its former extension on the north. Diagram D. Illustration of widening of river valleys. Diagram E. Probable ancient buried valley near Des Moines Rapids. Diagram F. Bluffs at Warsaw. Diagram G. Contour map of the sources of the Mississippi. Diagram H. Curve of mean of gauge-readings at Saint Louis and Rock Island for six- Diagram I. Mean curve and zone of range of river for sixteen years at Saint Louis. Diagram L. Meau curve and zone of range of river at Quincy for eight years. |