These worksheets were designed by me while teaching fourth graders in Las Vegas. A yearly field trip to the Hoover Dam was the inspiration for this activity. I do not have an answer guide for this, but you could easily have students cite their information and you'll likely know much of this if you are studying the Hoover Dam anyways!
This activity was a great team builder as groups interacted to locate answers to predetermined questions. The students then practiced public speaking skills as they shared the information with the entire group. Every year the students learned so much about the Dam, they were mini "tour guides" when we visited the dam site later in the year.