It's marked as `highway=footway` for routing purposes, and `bridge:structure=suspension` marks it as a suspension bridge.
According to https://www.valais.ch/fr/explorer/activites/autres-activites-estivales/passerelles/la-passerelle-des-gorges-de-la-vieze it's 90m long, according to JOSM it's mapped as 97.9 m long :)