Information from British Waterways:
At 3am on 2 October 1874, the boat Tilbury, carrying gunpowder to a quarry in the Midlands, exploded, demolishing the bridge and killing three people. Locals sprang from their beds, fearing an earthquake.
When the bridge was rebuilt, they turned the pillars around so that they offered a smooth surface for boats' towing ropes, Look out for the rope grooves on both sides of the pillars.
Little Venice to Camden Walk
Waterscape (British Waterways) have many canal-side walks and these photos are from part of this Little Venice to Camden Circular Walk. I chose to stop at Camden and not return to Little Venice. It's not a strenuous walk, it takes 1-2 hours, and my four year old managed it with minimal complaints. Be aware there might be diversions along the route but there are always directions posted so you won't get lost.