Can't remember the exact spot, but if you're driving South, the highway runs through part of the lake. Shiners work great along the W bank. Sorry but it's been 5 years since I lived in Iowa and almost 7 since i've been to Geode.
But the last few times I went I remmeber catching huge slabs.
I used to live in the Muscatine area... which has some real nice "pits" on the South side of town... those hold great crappie and bass.