Figure 35. A Nami Ring revetment was constructed in 1974 at 

 Little Girls Point on Lake Superior as part of the Michigan 

 State Demonstration Erosion Control Program. Damage to this 

 structure was extensive after two years of service. Photo- 

 graph courtesy of the Michigan State Department of Natural 

 Resources. 



Figure 36. An interlocking concrete block revetment forms a 

 checkerboard pattern on the shoreline. Vertical structure at 

 top of revetment is a reinforced concrete wave screen. Photo- 

 graph courtesy of Portland Cement Association. 



69 



