WEST 

 BREAKWATER — - 



1000 1B0O FT 



Figure 36. Layout of Burns Harbor, IN 



The rubble-mound breakwater was constructed with a multilayered 

 design and random placement of the armor stone cover layer. The crest 

 elevation was +4.3 m (+14 ft) low-water datum (lwd). Armor stones con- 

 sisted of rectangular-cut Indiana Bedford limestone blocks ranging from 

 9,100 to 13,600 kg (10 to 15 tons) on the trunk and 13,600 to 18,100 kg 

 (15 to 20 tons) on the head. Since completion of construction, extensive 

 breakwater damage has occurred. In the first 19 years of operation, an 

 average of 693,100 kg (7,640 tons) of stone per year was placed on the 

 breakwater. Between 1975 and 1989, the total amount of maintenance 

 stone placed on the structure was 131,647,900 kg (145,117 tons), 



32 



Chapter 2 Project Descriptions and Inspection Results 



