The pipeline proposed by TransCanada would carry oil from Canadian tar sands to refineries along the Texas Gulf coast.
In an email to attorneys Wednesday night, Lamar County Court-at-Law Judge Bill Harris ruled the pipeline would be a common carrier with the right to condemn land across the farm for the Keystone XL right-of-way.
Landowner Julia Trigg Crawford had argued that TransCanada trampled her property rights and the project could harm Caddo Indian artifacts on her farm.