Shepperd's Dell is closed due to uphill instability caused by the Eagle Creek Fire in 2017. You can still see it from the road, and it's a pretty nice one.
Bridal Veil is another nice waterfall, but the lighting made it really challenging to get a good photo. Many of these falls along the gorge would look great with fall colors and some good lighting. I'm sure they've been beaten to death though.
There's a nice interpretive trail at Bridal Veil that swings out with great views over Interstate 84, uh, I mean the Columbia River and the CRGNSA. Definitely worth a stop if you're driving by and haven't previously visited.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.