Here are links that have prior discussion information with good reference diagrams. (Yes they are special steel rods meant to endure high tensile psi). These rods transfer the load back into the main body of the concrete. Without these rods, the trunnion pins would bust away from the concrete column edge.
Oroville Anchor Tendon Drawings & discussion on replacement
Discussion: Accessing Oroville Anchor Tendons for replacement - Radial Gate Lift - Diagram
I missed this post - sorry. I didn’t notice hat we had moved to the next page. :)
OK, thanks!
(installed in such a way that the designers thought they would last forever)