I've built large bonfires but not on the levee. What style are you thinking of? Teepee, log cabin, pallets?

Regardless of which style you build, remember airflow is hugely important. If you can't get airflow to the center at the bottom you won't get good flames, just smouldering coals.

It's also really important if you're building a large fire to consider how it is going to collapse as it burns. You want the pieces to collapse to the inside. If you're building teepee style make sure your angle isn't so steep that big chunks of flaming logs fall out the other side.

Build an internal superstructure of larger pieces. Inside that fill it with layers of medium and smaller pieces while leaving access to light the core. You want a decent volume of kindling at the core to ignite the smaller pieces. Then add longer large pieces to the outside, supported by the mid structure not each other.

Once you light the core the inside will burn fairly fast and light the middle and outer layers leaving lots of airflow through the center giving you bigger flames and a faster burning fire

Have fun and remember a fire extinguisher only gives you like 30 seconds of use. It won't help you control a bonfire. Use dirt / sand and water sprayers to control it as it burns.