Fallout: New Vegas locations project
Hoover Dam intake towers
Located at Hoover Dam, and only accessible during the Second Battle for Hoover Dam, there are seen to be four intake towers in total, in which two are located on the New California Republic controlled side of the Hoover Dam checkpoint, and the other two residing within the Caesar's Legion side of the checkpoint. Entering the intake towers, they are seen to be relatively empty, with only a few randomized loot containers, and on the Caesar's Legion side of the Hoover Dam, they are also periodically seen to be occupied with legionnaires.
The Hoover Dam intake towers appear only in Fallout: New Vegas.