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[Looger]

Hi,
I have a quite big river on my map (a bit over 20 tiles width) and want to cross that river aboveground. But I can't build a bridge that is longer than 10 tiles. Is there a solution for that problem?

[StagnantSoul]

Build some constructed flooring the length you would the bridge, then when that's done extend that flooring to the end.

[Fearless Son]

You could build it entirely with floor tiles instead of a bridge, but that uses more material and cannot be retracted. 

One thing to do is make a double-bridge, like a draw bridge that lifts at both ends.  As long as the river is 20 tiles or fewer across (you may need to build out a few floor tiles anyway to make the gap small enough,) you can build a bridge at the near side of it such that the end of the bridge hangs over the halfway point of the river.  Then you can build a second bridge on the other side of the river.  So long as you can reach that second bridge via the first, and the second bridge has at least one end on land (on the far side) your architect and mason should be able to construct it. 

Then you end up with two bridges that meet up in the middle of the river. 

[Thisfox]

A bridge that retracts, meeting a floor which can't retract from the other side of the water, is also an option. And it's fun to watch the bad guys run off the end of the floor into the water when you retract the bridge in a hurry. Pity they were able to swim...

[Looger]

Thanks! I have now two bridges over the river  and a bit of floor.

[Skorpion]

There's the age-old solution of dumping lava into the river to make an obsidian dam.

Mandatory use of magma aside, masonry. Rock blocks are light, so just have a floor built over the river. Add walls and fortifications to exterminate the wildlife with marksdwarves, while you're at it, and a roof to prevent vomit.

[Fearless Son]

Thanks! I have now two bridges over the river  and a bit of floor.

So my technique worked for you?  Glad to hear it.  I recommend linking both bridges up to the same lever if you want to retract the bridge, it should raise both of them at the same time.