Tempe Town Lake Pedestrian bridge (1857)

From the Tempe Town Lake Pedestrian bridge. There was construction going on in the bed of the Salt River just to the west of the bladders. My guess is that they're planning on lengthening the lake. In this distance you can see the control tower for Phoenix Sky Harbor airport and then downtown Phoenix

Updated 3/7/2015: It turns out the bladder dam burst and they're building a new dam:
www.azcentral.com/story/news/local/tempe/2014/12/02/tempe-plans-two-year-warranty-year-dam/19767515