.. Fixing the bridge

Maybe you could build a makeshift walkway over the ravine.

There are some sturdy planks on that overturned truck.

You need a tool that can be used to build plank structures.

There is a hammer in the storage box inside the farmhouse. Fix the hammer.

You also need some nails.

Use the hammer on the planks. You have to have the nails in your inventory.

You can now cross the ravine by foot.

You can use the hammer, again, on the planks if you have enough nails. It might be that you can't do this on the first day.