PART II: SUMMARY OF CORPS BREAKWATER AND JETTY STRUCTURES IN NAD 



3. NAD has 58 projects which contain breakwater and/or jetty structures 

 that are located in four coastal districts as follows: New York (NAN), 21; 

 Philadelphia (NAP), 17; Baltimore (NAB), 16; and Norfolk (NAO), 4. Case 

 histories for these structures are included in Tables 1-58 which are ordered 

 according to the preceding districts and coastal location. Twelve of the 

 projects are located in an ocean environment, and the remainder are situated 

 in bays, sounds, or rivers. Overall, there are approximately 161,500 lin ft* 

 of breakwaters (22.6 percent) and jetties (77.4 percent). Most of the struc- 

 tures' cross sections are rubble mound (73.1 percent) or stone-filled timber 

 crib (10.4 percent). Other construction materials that have been used include 

 steel (Wilmington Harbor and Indian River Inlet), dolosse (Manasquan Inlet), 

 concrete cap (Manasquan Inlet and Ocean City Inlet), concrete block (Cold 

 Spring Inlet), and timber (Double Creek, Little Wicomico River, and Urbanna 

 Creek) . Thirty-three of the project structures have been repaired since 

 construction. 



4. Figures 1 through 4 are maps of NAN, NAP, NAB, AND NAO, respectively, 

 showing project locations. Pertinent summary information on each project is 

 presented in the following listing. 



* A table of factors for converting non-SI units of measurement to SI 

 (metric) units is presented on page 3. 



