It looks like a lake. It’s not.
It’s a reservoir of water that is unsuitable for drinking and for swimming. It’s maybe not so hot for wildlife, either.
“radioactive material, high bacteria content,
and abnormal pH levels”
Tempe Town Lake is a still body of water “at the confluence of the intermittent Salt River and the ephemeral Indian Bend Wash.” With those transient sources of natural water, it is filled primarily by water brought in by aqueduct under the Central Arizona Project.
If you’re wondering why it’s “aqueduct” rather than “aquaduct”
you can look here for the answer, but you might be sorry.
It looks like a lake. It’s not. It is, however, a fine place to walk at the start of a New Year to see a snowy egret and three bridges.