My pond is ~500 miles east of Snipe's place - just south of I-70 in the Middle of Misery.

PK shrimp have done very well in my pond.

As previously mentioned, having enough of the right vegetation is key.

My pond is still down ~3' due to the extended drought we've been in so there's not much shallow plant growth,
but I put a ton of cedar trees in while the pond was filling so there's dense cover from the north bank halfway
across the pond along a steep drop from 6'-16' (-ish when the thing is full) - lots of room for them to hide.

I stocked some scuds too but I don't ever see them. They either all got ate or they're hiding in the detritus on
the bottom of the pond. I haven't really gone looking for them lately so I can't be sure if I still have some.