Hey Strahm. Welcome to the forum. I graduated from NWMSU in 05 and Mozingo is where I found my love of fishing but I haven't been back to fish since. I'll be making the trip back this summer for sure. I didn't have a boat back then, so you're at an advantage.
That lake can produce some solid bass even fishing from the bank. There are a couple old sunken road beds, one at the end of 230th street and the other at the end of Lantern Road, both accessible from the East side of the lake. There's also a cove that we used to walk to and bank fish off 240th street that was our best spot for bass. Those road beds would be a good place to start for crappie as they're tree lined and you can even use them as a boat ramp if I recall and probably have some varying depths. I only bass fished from the bank but caught a few nice crappie on spinner baits on Lantern Road. There's a bait shop off Liberty Rd and the guy was always friendly and will be knowledgeable. Someone mentioned the 102 River off 136 Hwy, which is right on the way to Mozingo, get some dough bait and sit under the bridge to catch catfish and carp. We did it a few times and had some decent luck, nothing great but always caught a few. I fished the water treatment plant once and threw everything I had at them, but no luck and never tried again.
I've got another spot for you to try as well not for crappie but bass. There's a great pond that's actually on school property that produces bass in good numbers, you can fish b/t classes, I did! It's literally less than a half mile from Owens Library! Never caught anything big, but always a lot every time. I took Casting and Angling as my 1 hour gym credit and we fished this pond a couple times and the teacher said anyone from out of state didn't need a license b/c the land was owned by the school (I'd double check as that was 5+ years ago). Get on google maps and find County Club Road and Northwest Dr intersection on the west side of campus, right by the inter-mural softball fields. The pond is north of the ball fields and is accessible by a pretty narrow service road you can drive down or park at the end and walk. The west bank has a lot of good trees laying in the water, pick up some senkos and swimming senkos on a lighter crappie rod and hold on!!!
Good luck with this semester and when you're not studying, get out catch some fish!!! PS - I call Smithville my home on the weekends!