[mkuhn]

This bridge was most likely not constructed as a pedestrian bridge. What you see in the back probably is the bridge that replaced this one when a one way bridge did not provide enough capacity anymore and the old bridge was re-purposed as a passenger and probably cyclist bridge.

Based on that it was definitely built for higher load than just a few pedestrians.

Edit: The German language Wikipedia article actually confirms this [1]. It states that the bridge was built for a traffic load of 13 tons and that the new bridge was built in 1993 to increase capacity. The old bridge was thoroughly renovated after the new bridge had been constructed. The bridge actually is well documented and is under protection as an architectural landmark. It was exhibited in the MoMA for a long time.

Based on the amount of prep these guys put into this and the available documentation I don't see why they should not have checked if what they wanted to do is possible.

[1] http://de.wikipedia.org/wiki/Pont_de_Gueuroz

Edit 2: Some fascinating pictures from the time of construction: http://www.swiss-timber-bridges.ch/detail/193

[jacquesm]

> NB: This bridge doesn't exist any more

That's weird. It definitely looks like it is the same bridge but that page says it has been removed.

The construction clearly shows a concrete bridge in the making (lots of concrete forms visible) whereas the heading of the page is 'Swiss timber bridges'.

[mkuhn]

as far as i understand it the timber bridge was the temporary bridge used to support the construction and then torn down after the concrete bridge was completed.

[jacquesm]

Ah yes, it's labelled 'falsework', so the wooden structure is indeed just to support the main structure until it can be self supporting.