182 ANNUAL REPORT 
dam is located. The dam is built of concrete reinforced at the face 
and back with 3 by 3-16 inch longitudinal steel bands spaced 4 feet 
apart and interlaced with wire mesh. 
Five-eighth inch tie rods connect the two systems of reinforce- 
ment. Both back and face of dam are faced with vitrified brick or 
block. The dam is about 7% or 8 feet thick and is built in a partial 
dome shape, convex side upstream. The radius of the horizontal cur- 
vature is 100 feet. 
During construction it successfully withstood a severe overtop- 
ing flood. Messrs. Ross F. Tucker and Thomas M. Vinton built the dani. 4 
Fig. 120.—Sidewalk Composed of Reinforced Concrete Slabs, / 
According to the St. Louis Expanded Metal Company’s System. 
