When the spring rains got our creek running again, I had one deep hole where I would always sneak up and check the fish population.
I turns out that it also supported three large turtles (about dinner-plate size). It held a snapping turtle, a red-ear slider, and a soft shell. I saw the same three turtles all (apparently) peacefully co-existing for at least a month.
We didn't get much rain in the summer and when my water flow rate got too low, the algal bloom became so dense that I could no longer observe my turtles or fish.