Closer view might improve results for you.

Kaitlyn, it's a Sedge. You took two really good photos. The medium distance shot shows the general layout of staminate and pistillate spikes, plus general dimensions and growth pattern of leaves and plants. The close-up shot is also helpful. However, the staminate spikes are just developing, and the perigynia aren't even showing yet. You'll have more numerous and accurate responses if you wait until the spikes are mature, which should occur in about 3-5 weeks.

Lots of plants are native in Wisconsin that survive wet sites. The key is periodic flooding as most will not tolerate being wet all the time. Some that tolerate lowlands and wet in spring are: silver maple, river birch, speckled alder, nannyberry viburnum, black willow, sandbar willow, hackberry, swamp white oak, American linden, buttonbush, elderberries, tamarack, ironweed, red milkweed, blue flag iris ect. Some of these will tolerate more wetness than others. Speckled alder can practically grow in standing water it is so water tolerant. Bald cypress will take water well too and does survive in S.E. Wisconsin.

This was on an old, protected prairie site. But that doesn't mean the plants weren't introduced many years ago. The other genus that seems possible is Hymenocallis. Not sure about those rounded leaf tips, though. I'll be returning to that area several times this season, because it had a managed burn last winter. That makes special plants like Drosera brevifolia easier to see.