translate English to French: ▪ Where the only alternative is "dropping" a bridge into a river, and depending upon the fish habitat in the affected area, it may be necessary to construct a platform onto which the bridge could be dropped.
▪ Lorsque la seule possibilité consiste à abattre le pont, il faudra construire une plate-forme pour recevoir le pont si sa chute risque de perturber l'habitat du poisson.