Northern Arizona University 
Senior Capstone Project Spring 2006 
Chosen Design 
On Monday, February 28^{th} Robert McFadden received an email from Don Sluyk stating that he was only interested in a steel or timber bridge spanning the entire length of the ravine, preferably over its deepest point. Based on the 30% cost estimates for the steel and timber bridges, we concluded that the timber bridge would be the most economical option to pursue. New design criteria was submitted to Western Wood Structures for preliminary cost estimation. Due to the fact that the new timber bridge will span the deepest point of the ravine, its new length will be 105 feet. The cost for this new timber bridge is $123,000. Shown below is the 60% cost estimation for the total project and an AutoCAD rendering of the proposed design.
