248 



approved by the Board of Managers, by the Commissioner of 

 Parks, and by the Art Commission. After this had been deter- 

 mined, the boulders were saved rather than buried, and the re- 

 sult is now to be seen, complete, in so far as the stone work is con- 

 cerned. The bridge is unique, we believe, for this part of the 

 country, and it fits into its natural surroundings as well, or perhaps 

 better, than any other type of structure would have done. The 

 total length of the bridge is 172 feet, the width of the pathway 

 across it 1 5 feet, and the three central arches and the two arches at 

 the ends of the bridge are 16 feet wide. In order to insure suffi- 

 cient area in the cross-section of the valley for freshets, the bridge 

 has been built eight feet higher in the center than the wooden 

 structure which it has replaced, and, as a further precaution, the 

 path approach from the east will be built at a low elevation in 

 order to permit flood water to pass over it, which is not apt to 

 happen more than once in several years, and it may be that the 

 arches will take it all even at the periods of greatest flood. 



The bridge foundations rest, like those of the three driveway 

 bridges, on a stratum of gravel and coarse sand which underlies 

 the whole northern end of the Garden from the lakes to Williams- 



it the 



el, being s 



cellent material on which to build these heavy structures 

 fortunate, and no better basis could be desired ; a careful ins 

 of the three driveway bridges shows no trace of settling 



of this 



vere placed 



in a layer < 



3f sand about 



six inches thick 



jghly grout 



ted togethei 



r with strong < 



:ement; after this 



id the cenl 



ters were ta 



ken away, the 



: sand fell to the 



aving from 





inches of the 



underside of the 



)osed, wher 



1 a small arr 



lount of trimn 



ling of the rough 



ges gave th 



e desired fin 



ish. The beai 



Jty of this, and in- 



genuity of Mr. John 



