Barbara Dilger and I both happened upon a mink at the Spillway (by the Warden's Watch, near the parking lot) this morning around 8:40, and it did not seemed very concerned about us.

At one point it started heading in our direction and was on the Spillway bridge at one point. I took several photos before it moved away.  One of the photos is full frame with a 400mm lens, just to show you how close it got.

Nice looks at that white chin. I doubt they would go after a human but I would not linger if I saw this guy again.
      Full frame, with Spillway bridge in foreground ...