This story was in the local Tri-State news today which covers AZ, CA and NV..
Traffic halted over chalk can BOULDER CITY, Nev. - Hoover Dam was closed to all traffic for 2.5 hours today, as officials found on the dam an old army surplus ammo can with string dangling out the top. "Turns out that last night our contractor, who is re-striping the roads here, they had jerry-rigged one of those ammo cans into one of those chalk line, chalk string-things that make long lines," said Gary Bryan with Bureau of Reclamation. Bomb squad technicians handled the matter and the dam was re-opened to traffic at about 3 p.m.
