Table 20 



Little Lake Harbor Breakwaters 



Little Lake, Michigan 



Date(s) Construction and Rehabilitation History 



196A Construction of a 270-ft-long east breakwater and a 1 ,000-f t-long 

 west breakwater was completed at the site (Figure 54) . These were 

 rubble- mound structures with cellular steel sheet-pile heads. The 

 east breakwater included 3-ton (minimum) cover stone and an 8-ft-wide 

 crest width. The side slopes were 1V:1.75H and 1V:I.5H on the lake- 

 side and harbor side, respectively. The elevation of the structure 

 was +8 ft Iwd from the -6 ft contour lakeward and +6 ft Iwd shore- 

 ward. Stone of 5 tons (minimum) was also used (Figure 55). A 

 20.7-ft diameter cellular steel sheet-pile breakwater head was built 

 on the lakeward end. The cell was sand filled and capped with as- 

 phalt. Its crest el was +8 ft Iwd, and stone riprap was installed 

 around the structure (Figure 55) . The west breakwater consisted of 

 the same cross section as the east structure (Figures 54 and 55) , ex- 

 cept portions of the breakwater were constructed of 5-ton (minimum) 

 cover stone and 7-ton (minimum) toe stone. The west breakwater head 

 consisted of two 36.6-f t-diameter cellular steel sheet-pile struc- 

 tures. The cells were sand filled and capped with 3-ton (minimum) 

 cover stone. Their crest el was +8 ft Iwd, and riprap was installed 

 around the structures (Figure 55) . 



1986 The condition of the breakwaters is very good at present. The proj- 

 ect provides protection for recreational craft; however, entrance 

 into Little Lake during periods of storms is still hazardous because 

 of the scattered shoals in the channel entrance. Maintenance dredg- 

 ing is required annually. A model study was conducted to aid in the 

 development of the most economical plan to minimize shoaling without 

 adversely impacting navigation (Seabergh and McCoy 1982). Construc- 

 tion improvements have not been performed, however. 



92 



