Finally made it down there again today. Got there around 1, started fishing around 1:30, and kept at it mostly fruitlessly until 6:30, at which point we had to leave. I only caught 1 12" size stocker rainbow, on a 1/24 oz single hook black with gold spots and gold blade roostertail, casting into somewhat turbulent water past a riffle. It took me a bit to get release that one since it somehow got the hook stuck in one of it's gill rakers (think that's what those slots in the back end of the mouth are called). After that I figured since we were most likely not going to keep much, I bend the barb to make it easier to release any other ones. Well, I think that came back to bite me a bit in the rear, as I got 2 other good bites later on where both fish got off pretty soon into it. Oh well, my girlfriend got 2 trout and a sunfish and hers kept escaping too, without the bent barb so maybe it didn't really matter. Anyhow, she got 3 fish total, a little sunfish, and 2 trout including a nice 15". All 3 on a white 1/24 oz roostertail with gold spots and gold blade. She got the 2 trout before I even had my first. Aside from that I tried a little kastmaster spoon, some trout magnets under slip floats, one a normal size, the other the extra small version, and a 2.5 or 3" silver minnow style crankbait. The kastmaster got a couple close passes by, and the minnow had a less enthusiastic follow too, but inside the park that was it. I cast out some of the hard lures in the red ribbon section a couple times too and got a bite from something on the crankbait for a second but didn't get to see what.
A few things of note...1. I could've sworn I saw a little pickerel of some sort halfway down the spring at one point. It was only about 8" or so, but everything about the shape of it seemed to look like it was a pickerel. Guessing probably a grass one because of it's small size. I tossed a few lures by it, but it never seemed interested, so I can't confirm with 100% certainty but I can't figure out what else it would've been. Do they have those in the Meramec?
2. I really wish I could figure out how to get some of those suckers in the park to bite a lure. I tried the trout magnets by them a few times, but they wouldn't have any of it. Any hints on that?
3. Also very surprising to see, but while casting in the red ribbon section just below the park, I saw a good size snapping turtle make it's way underneath the water. I also didn't think they had those that far up. I thought snapping turtles only live in warmer, dirtier water.