What tease! This great map begs for my close scrutiny. Alas! It will not bear it.

Edit: Here is a decent hi res map of the watershed. Boy, do I want to read every detail of that map you shared, OP. I’m going down the rabbit-hole!

Edit2: Another mid/low res map of the basin, but its awfully MS-Paint.

Edit3: found this digital version, but no better, really:

EditFinal: Here’s a depth and elevation profile that I found that’s clear and fairly detailed. I am too busy today to get further sucked in, but I could spend the rest of my day staring at these maps…