One can try to make one's trip along the Singapore River interesting simply by exploring the history behind the many bridges that one finds as one walked along the river.
I suppose for the same reason, that was why one of my friends had mentioned that it is interesting to walk along River Thames (London) and understand the background behind each and every bridge that lies along the river. I vaguely remember that some of the bridges along River Thames were considered obsolete and were removed for good.
Talking about replacing the obsolete, I understand that Anderson Bridge was built (completed in 1910) because the nearby Cavenagh Bridge was not able to cope with the increasing traffic.
The one thing that we should be grateful of is that Cavenagh Bridge was not demolished after Anderson Bridge was completed. Instead, it was converted to a pedestrain bridge, and has continued to serve this function till today. It is nice to catch glimpses of bumboats passing by while standing on Cavenagh Bridge.
References and worthy links: