Work proceeds on the massive Boulder Dam in Colorado.
Unused / unissued material - no paperwork - dates unclear or unknown.
Flash frame French title reads: "Boulder Dam, Colorado. La construction d'un barrage qui sera le plus grand du monde."
Boulder Dam, Colorado, United States of America (USA).
High angle views of the massive construction work at the Boulder Dam. Shots of the massive amounts of concrete being poured and spread out by men. Men plant charges and then abseil down the rocks. Shots of the charges exploding and dust rising after the explosions.