It is not really a secret but just can't find it in the lake database.
I fished Mini Park in Snohomish County right next to Scriber Lake which is a few blocks from Hall Lake and Alderwood Mall.

Mini Park looks man made and is very shallow, dirty, and small...didn't know what we would catch but as we drove up there were a few guys leaving with a float tube so we thought we'd give it a try with a senko.

We tried around the shore line where theres some bushes overhanging and weeds but no bites other than mosquitos. I was getting small bites and actually hooked into a tiny bass but got off as I was reeling it in. After being obliterated by mosquitos, we decided to call it a night as it was already 9 PM and fairly dark.

One last cast couldn't hurt right? I hook up a nice largie and it put up a nice fight but reeled it in. The colors on it was a little bit different from most LMB. it wasn't as green and had a very odd grayish color to it. Must be the water...

We only fished it for like 30 minutes but I'm guessing it might hold some nice bass in there.

---