Grow the Flow, a Utah-based water policy and advocacy non-profit group, has placed billboards throughout Salt Lake County, live tracking the lake’s water levels.

Drivers may notice new billboards across Salt Lake County roadways that do much more than hawk attorney services or promote casinos that sit just over the state line.

Clocking in at roughly 35 miles wide and 75 miles long, the Great Salt Lake is the largest natural saltwater lake in the Western Hemisphere. The lake's name comes from the nature of the water ...