Systems and methods for installing a livestock fence across a waterway

A livestock fence assembly for use across a waterway having a flow direction and a substantially horizontal bed surface, the fence assembly comprising:

• a foundation having a bottom portion configured to be disposed parallel to and below the bed surface, a top portion configured to be disposed proximate the bed surface, and an interior region between the top portion and bottom portion;
• and
• a plurality of spaced apart poles, each having a proximal segment secured to the bottom portion of the foundation and secured to the top portion of the foundation, and having a distal segment extending upwardly in a plane which forms an angle α between 30° and 75° relative to the flow direction;
• and
• at least one cross-section member within the foundation, wherein the at least one cross-section member interconnects the plurality of poles;
• wherein the assembly is substantially devoid of any structure between distal segments of adjacent poles.