The consistent rain this spring has made the trails muddy and the waterfalls flowing at Starved Rock State Park. One of my favorite hikes is Illinois Canyon which is wide with vertical walls. It ends with big pool, not a high waterfall. It is best in early spring with lots of wildflowers or fall with autumn leaves against the canyon walls, but late spring has some benefits and rich green color.
At the other end of the spectrum is the highest waterfall in the park in Wildcat Canyon. The hike usually takes you to the top of the canyon with a nice view into the pool below. Then with a long hike down, you can hike into the canyon.
I find French Canyon to be the most challenging to photograph. The waterfall gently cascades down the wall and then flows out in a narrow creek. The heavy flow from the rain created some nice patterns when looking out the canyon.
The most dependable water flow in the park is in St. Louis Canyon, and the marvelously carved canyon walls by the waterfall creates a classic Starved Rock view.