If i build a house on the bank of a creek will I need to build a wall in the creek?

The creek is large for a creek and I noticed my neighbor has a wall inside the creek and I'm guessing he built it to keep his land from washing away as the wall is in front of his house and workshop. Should I build a wall for my creek?

There is a lot more than this to consider when building at or near a creek.

You should learn what the experience is with flooding, and the extent of flooding if any.

If the neighbor's wall is in the creek, it is possible it was built on the bank, but that the creek has washed out behind it!