Dwarf Fortress Bug Tracker - Dwarf Fortress
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0007695Dwarf FortressDwarf Mode -- Buildings, Generalpublic2014-07-28 12:482017-12-01 13:52
normalminorhave not tried
0007695: Tree grows adjacent to a bridge, bridge collapses
It seems that a tile update (when a tree grows) messes with a construction...
Also, side of a tree above the bridge (where it has been) looks "cut-off", may be random and not caused by this bug...
Try to build bridges near live saplings that may grow eventually...
Further investigation needed...
duplicate of 0009946new  Retracting bridges don't require support for construction, harmlessly deconstruct when checking support later 
Issue History
2014-07-28 12:48eliotcougarNew Issue
2014-07-28 12:50eliotcougarTag Attached: 0.40.05
2014-07-28 12:50eliotcougarIssue Monitored: eliotcougar
2015-07-12 11:10DetrosNote Added: 0032896
2016-07-31 07:23LociNote Added: 0035729
2016-07-31 07:23LociAssigned To => Loci
2016-07-31 07:23LociStatusnew => needs feedback
2017-12-01 13:52LociNote Added: 0037172
2017-12-01 13:52LociRelationship addedduplicate of 0009946
2017-12-01 13:52LociStatusneeds feedback => resolved
2017-12-01 13:52LociResolutionopen => duplicate

2015-07-12 11:10   
Do you have a save of the final state or even better a save where it soon happens? If so, upload zipped region folder to http://dffd.bay12games.com/ [^] and post a link to it here.

Are you sure there are no tree parts above the place of the bridge? This is probably connected to 0007872, "Trees growing through bridges".
2016-07-31 07:23   
Was the destroyed bridge an unsupported retracting bridge (0009946)?
2017-12-01 13:52   
Presumably the growing tree caused a "support check" and the unsupported retracting bridge deconstructed (0009946).