Advice
I got an internship with Kiewit as a freshman. I know that there may be a stereotype that Kiewit only hires older students with more experience, but I would recommend you still interview and try out for these positions as a younger student. It is possible to work at Kiewit as an underclassman.
Another piece of advice is to keep up your relationships with Kiewit employees after your summer ends. Make LinkedIn contacts, attend Kiewit networking events, and more to stay close to the company after your internship ends.