Dwarf Fortress Bug Tracker - Dwarf Fortress
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0008756Dwarf FortressDwarf Mode -- Buildings, Generalpublic2015-01-20 11:362016-07-31 06:41
normalminorhave not tried
Toshiba LaptopWindows7
0008756: Trees growing under bridges prevent bridges from being used
I noticed my dwarves wouldn't get in or out of the fortress. I have a single bridge to the outside and a tree had grown under it. Dwarves refused to path across it. I cut the tree and the problem was solved.
Build a bridge, mine's 3 z-levels above ground, wait for a tree to grow under it and become high enough to touch the bridge.
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duplicate of 0007872new  Trees growing through bridges 
Issue History
2015-01-20 11:36DebocheNew Issue
2015-01-20 13:00lethosorSummaryTrees under bridges make bridges restricted => Trees growing under bridges prevent bridges from being used
2015-07-10 06:14LociNote Added: 0032873
2015-07-12 11:05DetrosNote Added: 0032895
2016-07-31 06:41LociRelationship addedduplicate of 0007872
2016-07-31 06:41LociStatusnew => resolved
2016-07-31 06:41LociResolutionopen => duplicate
2016-07-31 06:41LociAssigned To => Loci

2015-07-10 06:14   
duplicate of 0007872
2015-07-12 11:05   
That doesn't say anything about usability of such bridge. This is rather a duplicate of 0008308, "Strange interactions between trees and bridges" which notes that "bridge tiles constructed on twigs cannot be crossed by dwarfs."

Though possibility of building of bridge on tree parts and possibility of growing of tree parts under bridge can be two separate issues.