The Division Engineer considered the desires of the cooperating 

 agency, determined the sources and movement of beach material, the 

 changes in the shore line and offshore bottom, the effects of winds, 

 storms and of existing structures, developed plans for protecting 

 and improving the shores of the area., and made an economic analysis 

 of proposed new protective and improvement construction for Lynn-Nahant 

 Beach. He found that prospective benefits warrant construction of 

 these measures and that the public interest therein justifies 

 Federal participation to the extent of one-third of the total cost 

 of recommended new work, in accordance with the policy established 

 by Public Law 727, 79th Congress, 



The Division Engineer recommended, subject to certain conditions,. 

 adoption of a project by the United States authorizing Federal 

 participation in an amount equal to one-third of the first cost of 

 protecting and improving the beach between Woodbury's Point, and the 

 dune on Nahant tombolo, a distance of about 2,600 feet, by placing 

 172,000 cubic yards of sand thereon to provide a backshore elevation 

 of 18 feet above mean low water, and constructing a stone mound having 

 a top elevation of 18 feet above mean low water along the tombolo 

 from the improved beach to Little Nahant, a distance of 6,250 feet. 



The Division Engineer also recommended a plan for insuring the 

 stability of existing seawalls on the mainland shore between . Blaney 

 Rock and Woodbury* s Point, consisting of the construe t5.on of steel 

 pile cut-off walls at those places where toe walls do not extend 

 below elevation 6 feet above mean low water, and refacing the exist- 

 ing wallo The entire cost of this maintenance work should be borne .. 

 by local interests as it is not eligible for Federal a33istance 

 under the policy established by Public Law 727, 79"th Congress. 



The Beach Erosion Board carefully considered the report of the 

 division Engineer. It concurred generally in his conclusions and v 

 recommendations . 



The beach under study, lying at the head of Nahant Bay, is pro- 

 tected by the headlands at Philips Point and those of Nahant and 

 Little Nahant. As a result, the beach is reasonably stable . Material 

 is moved by wave action back and forth within the area, but the rate 

 of loss of material from the area is low. The headlands have been 

 protected by seawalls, most of which are 4-0 to 45 years old and now 

 in poor condition. The Beach Erosion Board is of the opinion that 

 the storm damage to these concrete seawalls described by the Division 

 Engineer can be attributed largely to the deteriorated condition 

 of concrete 4-0 to 45 years old. Modern seawalls of concrete properly 

 designed and constructed will certainly withstand similar exposure 

 to wave action with little or no damage. 



In connection with the recommendation of the Division Engineer 

 for armoring the existing concrete wall between Blaney Rock and 



36 



