land options it held on the river to lapse--including an option for what became the site of Hoover Dam.

In the following years, the Bureau of Reclamation (BOR), known as the Reclamation Service at the time, also considered the Lower Colorado as the site for a dam. Service chief Arthur Powell Davis proposed using dynamite to collapse the walls of Boulder Canyon, 20 mi north of the eventual dam site, into the river. The river would carry off the