Agree with the Loblolly assessment.
The needles almost look like short leaf on the canopy picture, but the bark, diameter, and location make me think it is loblolly.
Loblolly and shortleaf can be very hard to tell apart sometimes. They both vary in needle clusters of 2 or 3 and they can even have similar needle lengths.
Longleaf and Slash look significantly different.
[This message has been edited by PineTreeAg (edited 11/7/2013 7:03p).]