I spent a LARGE amount of my childhood catching those little fish down at Nose Creek with a dip net.
They are partly sticklebacks (mostly right along the bank).
Many of the others are just random minnows. They get quite big though... for minnows.
This is a stickleback:
There are also suckers in Nose Creek... at one point I unintentionally caught one in my net... it was about 12-16 inches long... big surprise for a kid trying to find minnows.
Sucker: