SH 105 Brazos River Bridge Jigsaw Puzzle SH 105 Brazos River Bridge On a per pound basis, cross-frames can be some of the more costly elements in a steel bridge. Reduce the overall bridge costs--and speed up fabrication and erection--with lean-on bracing! NSBA’s Lean-on Bracing Reference Guide is written to educate designers and allay concerns by providing design criteria, commentary, and easy to follow examples. Download the free guide today at aisc.org/leanonbracing, and implement lean-on bracing with confidence! The SH 105 Brazos River Bridge in Navasota County, Texas is a pioneer in implementing lean-on bracing for a non-skewed bridge. Assemble a jigsaw puzzle of this remarkably economical project.