Installation 

 date 



1973 



Location 



Description 



Avon Harbor, North Carolina Two jetties of hydraulically 



filled white-coated bass. 



Late 1973 Shores of Michigan on Lakes Demonstration revetments and 

 Huron, Michigan, and Superior. groins protecting State- 

 owned property; bags filled 

 hydraulically. 



Originally, bags were made of uncoated nylon and filled from a hopper, 

 sewn closed, then dropped or dumped into place. Later, the nylon material 

 was coated with black acrylic resin or white polyvinyl chloride to retard 

 deterioration and the bags were manufactured with a self-sealing opening 

 which allowed them to be filled in place by pumping sand into them. CERC 

 has no more information than that listed for projects built between 1968 

 and 1970. 



75 



