Oh and Ice9 - You should be able to use the USGS topographical survey overlays from back in the day to ballpark the depth once you determine your search area by comparing them to the current ones, and then determining the distance between them and vista point, ya mean?
Hah! Well, math isn't exactly my strong area...
![Big Grin :D :D](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png)