 There were 112 deaths associated with the construction of the dam . The first was J. G. Tierney , a surveyor who drowned on December 20 , 1922 , while looking for an ideal spot for the dam . Ninety @-@ six of the deaths occurred during construction at the site . Of the 112 fatalities , 91 were Six Companies employees , three were BOR employees , and one was a visitor to the site , with the remainder employees of various contractors not part of Six Companies . 
 <a href='dey_it' title='1'><mark>There</mark></a> <a href='uninflect' title='2'><mark>were</mark></a> 112 deaths associated with the construction of the dam . The first was J. G. Tierney , a surveyor <a href='null_relcl' title='3'><mark>who</mark></a>drowned on December 20 , 1922 , while looking for an ideal spot for the dam . Ninety @-@ six of the deaths occurred during construction at the site . Of the 112 fatalities , 91 <a href='uninflect' title='4'><mark>were</mark></a> Six Companies employees , three <a href='uninflect' title='5'><mark>were</mark></a> BOR employees , and one was a visitor to the site , with the remainder employees of various contractors not part of Six Companies . 
It was 112 deaths associated with da construction of tdadam . The first was J. G. Tierney , a surveyor drowned on December 20 , 1922 , while looking for an ideal spot for the dam . Ninety @-@ six of the deaths occurred durin construction at the site . Of thda12 fatalities , 91 was Six Companies employees , three was BOR employees , and one was a visitor to thedate , w/ the remainder employees of various contractors not part of Six Companies .