This is looking from what will be the far end of the trestle.
From the white posts on this end to the first sonotube will make the trestle 100' long.

This is looking to where we were standing in the first picture.

The far end of the first picture, you can see the four finished sonotubes.

Four sonotubes finished today. We need to put 20 more.

Here is a view of where the trestle will cross.
I'll post another to show the finished product.