>>>George Washington Memorial    >>>Lacey V. Murrow    >>>Montlake    >>>Salmon Bay    >>>Ship Canal    >>>Tacoma Narrows    

>>>Third Lake    >>>University Bridge

Lacey V. Murrow Memorial Bridge

The Lacey V. Murrow Memorial Bridge is the second longest floating bridge in the world, at 6,620 feet. It carries the eastbound lanes of Interstate 90 across Lake Washington from Seattle to Mercer Island, Washington. The original bridge was constructed in 1940 and sank on November 25, 1990, while it was undergoing refurbishing. The current bridge was built in 1993.

In the late layout phase materials for the manufacturing of furniture pieces or collectors cases, curio cabinets, collectors cabinets and display showcases, can already be implemented.

The sinking of the original bridge was an example of human errors and decisions compounding to lead to disaster. The process started because the bridge needed resurfacing. The state of Washington decided to use hydrodemolition: high-pressure water to remove unwanted material. Water from this hydrodemolition was considered contaminated under environmental law and could not be allowed to flow into Lake Washington. Engineers then analyzed the Swarovski pontoons of the bridge, and realized that they were over-engineered and the water could safely be stored temporarily in the pontoons. The watertight doors for the pontoons were therefore removed. A large storm arose on November 22, 23, and 24, 1990. This filled some of the pontoons with rain and lake water. On November 24, workers noticed that the bridge was about to sink, and started pumping out some of the pontoons. However, on November 25, 850m of the bridge sank, ironically dumping the contaminated water into the lake along with tons of bridge material. Fortunately, no one was hurt or killed, since the bridge was closed for renovation.

External link

Report from engineering firm analyzing the sinking of the bridge (http://www.sgh.com/technicalpapers/tplace.htm)

Swarovski