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[Detros]

According to DF wiki bridge will not operate when unit with size higher than 1200000 (see list of such units) is standing on it and deconstruct itself when you try to lower it on such unit. Note the size is not cumulative but separately checked for each unit on/under the bridge.

This applies too to retracting bridges?

Apparently yes.
"Bridges will not operate if any one creature of size 1200000 or larger is on them. This weight limit is not cumulative - a bridge will still retract if a hundred goblins are standing on it, but a single rutherer accompanying those goblins will prevent the bridge from operating. Attempting to lower a drawbridge onto such a creature (in order to atom-smash it) will cause the bridge itself to deconstruct. Attempting to "unretract" a bridge while such a creature is in any of the bridge tiles will similarly cause the bridge to deconstruct."

[RocheLimit]

My current understanding of bridges, both raising and retracting.

Building destroyers cannot destroy them themselves.

I've found atom-smashing anything yak/buffalo sized or bigger will deconstruct the bridge.

Trying to retract the bridges, again with anything yak/buffalo sized or bigger, will not work either.

Magma in contact, lowered or raised, with a magma safe bridge?  Fine.  Non-magma safe mechanism?  Mechanism eventually is destroyed and bridge either lowers or is deconstructed.

Magma in contact, lowered or raised, with a non-magma safe bridge?  Will eventually be eaten through.  Magma-safe mechanism won't save you here.

Fire, I believe, acts the same way.  And Dragonfire.

I have had raised bridges destroyed by dragonfire (in DF2012).  I have had raised bridges destroyed by magma (again, DF2012).  Fire itself is rather rare in my games, so basing my view of that off magma's reactions. 

Bridge tip:  When building a 1x1 raising bridge, you can check if it is raised by trying to build furniture (or maybe a wall) on it.  When lowered, your error will read 'building present'.  When raised, it will read 'blocked'.  *edit: or it could be reversed: I do not recall exactly.*

[Detros]

Bridge tip:  When building a 1x1 raising bridge, you can check if it is raised by trying to build furniture (or maybe a wall) on it.  When lowered, your error will read 'building present'.  When raised, it will read 'blocked'.  *edit: or it could be reversed: I do not recall exactly.*

You are right, see the last paragraph of this section of Bridge article at DF wiki. And it makes sense to me: raised bridge is a showed as a wall (which is not a building) so that tile is blocked by this "terrain feature" while when lowered you can path through there but that tile is already occupied by other building in, say, paved road way so you can't built additional buildings there.

[Bumber]

Magma in contact, lowered or raised, with a magma safe bridge?  Fine.  Non-magma safe mechanism?  Mechanism eventually is destroyed and bridge either lowers or is deconstructed.

Magma in contact, lowered or raised, with a non-magma safe bridge?  Will eventually be eaten through.  Magma-safe mechanism won't save you here.

Bridges built with non-magma-safe materials will heat up and eventually melt if the center tiles get covered in magma or exposed to fire, whether the bridge is raised, lowered, or even retracted.

Any idea which tiles are considered the center tiles for an arbitrarily sized bridge? A raised bridge with its center tiles in the raised portion (or on the opposite side as the magma) should be safe since tiles adjacent to magma only get to 10075U.

[arbarbonif]

Side question: Can raised bridges be climbed like walls?

[se5a]

Raised bridges are immune to heat but lowered bridges can be destroyed by extreme heat if they are not built of magma safe materials.

I can confirm that this is incorrect.
my latest fort had a zombie dragon which started a forest fire. my raised wooden bridge caught fire as a result of the fire sweeping across the grass.

[Detros]

Raised bridges are immune to heat but lowered bridges can be destroyed by extreme heat if they are not built of magma safe materials.

I can confirm that this is incorrect.
my latest fort had a zombie dragon which started a forest fire. my raised wooden bridge caught fire as a result of the fire sweeping across the grass.

DF wiki states "Bridges built with non-magma-safe materials will heat up and eventually melt if the center tiles get covered in magma or exposed to fire, whether the bridge is raised, lowered, or even retracted. " and continues about "least fire-resistant item involved".