Ok, I sent the picture to one of our Bio's and this is what he came back with
Here are some of the details that I was needing to look for:
NO lateral compression: rules out golden shiner, rudd, roach.
Anal fin has 8 to 9 rays: rules out golden shiner, rudd, roach.
Barbel appears to be above the corner of the lip and inset: character of only creek chub, lake chub has the barbel at the corner of the mouth.
Small eye to head length: rules out all of the eastern minnows except creek chub.
47 Lateral line scales (yes, I counted them. It's what I do for work too).
My main concern was lake chub, even though I was pretty certain on creek chub. I still don't know where this specimen was collected, but I'd be pretty certain on it being a Semotilus species if it wasn't collected in Colorado. Assuming IFF isn't fishing out of state, it would have to be Semotilus atromaculatus, creek chub.