LIST OF ILLUSTRATIONS. 



PART I. 



Bars in the Mississippi River, example of 13 



Mean monthly discharges of the Niagara, Ohio, 



Missouri, and Mississippi rivers, diagram of.. 15 



Precise level, Buff and Berger, general view. ... 23 



PAGE 



Precise level, Kern, general view 24 



Precise level. French Government 24 



Profile of overflow for weirs 31 



Discharge curves for weirs 31 



PART II. 



REMOVAL OP BARS, ETC. 



General view two- yard dipper dredge 43 



General view elevator dredge 45 



Hydraulic dredge " Ram " 46 



General view hydraulic dredge 47 



Sea-going dredge "Reliance " 48 



Hydraulic dredge ' Gamma" 48 



Plans and sections of dredges 49 



DIKES. 



General form of spur-dikes used on the Ohio 



River 60 



Map of " Four-mile dikes," Ohio River 61 



Illustration of brush and rock dams and dikes, 



upper Mississippi River 63 



Sections of closing and longitudinal dikes, Ohio 



River, and of French and German dikes 65 



PROTECTION OF BANKS. 



Sections of bank protections 69 



Construction of woven mattresses 70 



Shore protection, Mississippi River 71 



Sections showing mattresses and method of 



placing 71 



Location of barges during mattress construction . 72 



Fascine mattresses, view of 73 



Spur revetments at New Orleans 74 



LEVEES. 



Sections of levees, Mississippi River 78 



Sections of old levees, Mississippi River 80 



Sections of levees in Holland 98 



Sections of levees in Holland, Germany, Italy, 



etc 99, ico 



STORAGE RESERVOIRS. 



Map of the reservoir system of the St. Law- 

 rence basin ioa 



Chart of oscillations of level of the North Ameri- 

 can Great Lakes 104 



PART III. 



LOCKS. 



General view of the locks of the St. Mary's Falls 



canal, Mich 146 



General plan, etc., of Lock No. 7, Kanawha 



River, W. Va 150 



General plan, etc., upper portion of Kampsville 



Lock, Illinois River, 111 155 



Views of different types of guide cribs 159 



View of a triangular guard crib 161 



View of a wooden lock-gate 161 



View showing the construction of a concrete 



abutment 165 



LOCK-GATES AND VALVES. 



General plan, etc., of a wooden lock-gate (double 

 timbers), Kanawha River, W. Va 180 



General plan, etc., of a wooden lock-gate (bow- 

 string truss) , Illinois River, 111 182 



FIXED DAMS. 



General view of a step and of a fixed dam 200 



General view of Dam No. 7, Kentucky River, Ky. 203 

 General view of Dam No. i, Barren River, Ky . . . 206 



xiii 



