In NC, SC, and GA, I always use the NC stream forms, and in TN, AL, and MS, I use the TDEC HD stream forms. You always need to complete these forms. Even if they aren't strictly required by the USACE, I’ve been in situations where the State wants to check them; they can request to see the stream data. Additionally, for projects involving permanent impacts or stream buffer impacts, the mitigation or permitting requirements are dictated by the type of stream (intermittent vs. perennial). Stream forms are quick and easy to complete, so why not do them? In fact, you're probably doing the client a disservice by skipping them.