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Daniel Boone Bridge
The Daniel Boone Bridge is the name for two bridges carrying Interstate 64, U.S. Route 40 and U.S. Route 61 across the Missouri River between St. Louis County and St. Charles County, Missouri. The older bridge, which carries westbound traffic is a continuous truss bridge, while the newer bridge, which carries eastbound traffic is a deck girder bridge.
==1935 bridge==
The original bridge was opened in June 1935.〔St. Charles Banner News June 25, 1937. Elaborate Plans for Bridge Dedication Saturday〕 Initially serving both directions of travel (one in each direction) it was restriped for three lanes total, with the middle lane being a signal-controlled reversible lane. Following the opening of a parallel span in 1989, the bridge was rehabilitated, then converted to serve two lanes of westbound traffic (while the new bridge served eastbound traffic). In 2001, MoDOT again striped the bridge back to three lanes to add an extra westbound lane through the area. As the AADT rapidly increased, there came to be an increasing need for a wider bridge with standard-width lanes and shoulders (both of which the bridge lack). Furthermore, the aging structure had reached the point in life where regular maintenance was required, which not only was a money drain to the state, but was also an inconvenience to drivers, due to the lane closures needed to safely make the repairs. As a result, MODOT started planning for a new replacement in the early 2000s. Construction started in the spring of 2013, it opened to eastbound traffic on June 28, 2015. Traffic across the old bridge ceased on November 5, 2015 after the former eastbound span opened to westbound traffic. Even though the bridge is eligible for the NRHP list, it is slated to be demolished in 2016.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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