OK, here's the rough model for the dam.

I've had a real hard time figuring out alignment with the provided pictures. Predominantly it turned out to be a problem with alignment between the image planes of the top and front camera. That messed up proportions. I'm still not completely satisfied with the alignment to the "production" plates, so I'll continue tweaking it as I go. For now I don't want to be hung up.

Eager to start exploring the next steps.