Table 37 (Continued) 



Date(s) Construction and Rehabilitation History 



1923 Construction of the southern end of the southerly extension (Fig- 

 ure 97, Section H) was completed. It consisted of a stone-filled 

 concrete breakwater (Figure 99, Section H) built on a stone base. 

 The crest el of the extension was +6.1 ft Iwd, and its width was 

 8.3 ft. 



1928- The exterior breakwater (Figure 97, Sections C, D, and E) was capped 



1929 with a concrete superstructure. The crest el of the breakwater was 

 +7.1 ft Iwd. Riprap (7-ton average) was placed on the lakeside of 

 the structure (Figure 99, Sections C, D, and E) to an el of +4.6 ft 

 Iwd on a 1-V:1.5-H slope. Seven-ton riprap also was placed on the 

 harbor side in some areas (Figure 97, Sections C-4 and E) . 



1930 Portions of the inner breakwater (Figure 97, Sections 0, P, R, and S) 

 were capped with a concrete superstructure. The 150-ft-long portion 

 of section (Figure 98) included a parapet with an el of +8.85 ft 

 Iwd, and the 300-ft-long portion of P had a crest el of +7.1 ft 



Iwd. The remaining portions (Sections R and S) were constructed with 

 crest els of +6.43 ft Iwd. 



1934 The remaining sections of the inner breakwater (Figure 97, Sec- 

 tions K, L, M, N, and U) were capped with concrete superstructures. 

 The longest length (3,488 ft) of structure (Section N) included a 

 parapet with an el of +8.85 ft Iwd (Figure 98). A 100-ft section of 

 the breakwater (Section U) also included a parapet, but the crest el 

 was +8.58 ft Iwd. This portion of the breakwater also included the 

 installation of steel sheetpiling on each side of the timber cribs 

 and riprap toe protection (Figure 98, Section U) . The northernmost 

 end of the inner breakwater had a crest el of +5.1 ft Iwd (Figure 98, 

 Section K) , and the remaining portions of the structure (Sections L 

 and M) involved a +7.1-ft-lwd crest el. 



1950 The inner end of the shore arm extension (Figure 97, Section A) was 



capped with a concrete superstructure. The superstructure included a 

 parapet with an el of +7.0 ft Iwd (Figure 99, Section A). 



1955 A 1,000-ft-long portion of the shore arm extension (Figure 97, Sec- 

 tion B2) was capped with a capstone superstructure. The minimum size 

 of the capstone was 4 tons (Figure 99, Section B2) , and the crest el 

 was +7.0 ft Iwd. A portion of the inner breakwater was repaired 

 (Figure 97, Section R) . Riprap (7-ton average) was placed on each 

 side of the existing breakwater (Figure 98, Section R) . The stone 

 extended above Iwd and had side slopes of 1V:1.5H. 



1958 Riprap (7-ton average) was installed on each side of the southern end 

 of the inner breakwater (Figures 97 and 98, Section S) . The stone 

 protruded above Iwd and had 1-V:1.5-H side slopes. 



1960 A 300-ft-long portion of the shore arm extension (Figure 97, Sec- 

 tion Bl) was capped with a concrete superstructure which included a 

 parapet installed at an el of +7.0 ft Iwd (Figure 99, Section Bl). 



(Continued) (Sheet 2 of 3) 



161 



