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During the evening rush hour on August 1, 2007, it suddenly collapsed, killing 13 people and injuring 145. The bridge was Minnesota’s third busiest, carrying 140,000 vehicles daily.Search for: When did the bridge collapse What bridge collapsed in the San Francisco earthquake.The collapse of the Cypress Street Viaduct Nimitz Freeway caused most of the earthquake-related deaths. The San Francisco–Oakland Bay Bridge was also damaged when a span of the top deck collapsed.Search for: What bridge collapsed in the San Francisco earthquake How does the bridge work.They do it by carefully balancing two main kinds of forces called compression a pushing or squeezing force, acting inward and tension a pulling or stretching force, acting outward, channeling the load the total weight of the bridge and the things it carries onto abutments the supports at either side and piers The contractors were allowed seven years from April 20, 1931, but concrete placement in the dam was completed May 29, 1935, and all features were completed by March 1, 1936. Search for: How does the bridge work What is the most common material used in bridge construction.Many types of materials have been used to create modern bridges, including concrete, steel, wood, iron, plastic and stone. Today, we learned that concrete and steel are the most commonly used materials in large modern bridges.Search for: What is the most common material used in bridge construction When was the first bridge ever built.The annual median salary for a civil engineer was $77,000 in 2011, according to the BLS. If a lengthy degree program is a deterrent for a career as a building designer, an architectural drafter career may be a better choice. Drafters work under the direction of architects to prepare drawings for building designs.Administration is usually 5% of the budget, so plan on paying $1,500 for a $30,000 project. Most architects who charge on a percentage basis will charge 8-15% of the total cost of the project, so you can plan on spending $800 to $1,500 for every $10,000 worth of work you want done.