MoDOT opened an additional bridge upstream of the original span, as a result of increased congestion. The bridge was initially built for two eastbound lanes, however the shoulders were converted to travel lanes in 2001, for a total of four lanes.
MoDOT added a new bridge upstream of the existing span due to increased traffic volume. The initial bridge was configured for two eastbound lanes but had its shoulders converted into travel lanes by 2001, thus increasing the total number of lanes to four.