Dwarf Fortress Bug Tracker - Dwarf Fortress
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0007872Dwarf FortressDwarf Mode -- Environmentpublic2014-08-06 05:282015-07-14 23:47
normalminorhave not tried
0007872: Trees growing through bridges
I channeled a hole for above-ground farm plots and roofed over the opening with a green-glass bridge. Two trees have grown through the bridge (the trunk is below the bridge, extends through the bridge, with branches and leaves on the z-level above the bridge. The bridge, at this point, appears intact and undamaged.
build a bridge over some saplings and wait
No tags attached.
related to 0007814needs feedback Footkerchief Trees will still punch holes if ceiling is high enough. 
has duplicate 0008756resolved Loci Trees growing under bridges prevent bridges from being used 
related to 0008308new  Strange interactions between trees and bridges 
Issue History
2014-08-06 05:28LociNew Issue
2014-08-06 07:43FootkerchiefRelationship addedrelated to 0007814
2015-07-12 11:12DetrosNote Added: 0032897
2015-07-14 12:04LociNote Added: 0032908
2015-07-14 23:47DetrosNote Added: 0032910
2016-07-31 06:41LociRelationship addedhas duplicate 0008756
2016-07-31 06:42LociRelationship addedrelated to 0008308

2015-07-12 11:12   
Are dwarves able to path over that bridge? According to 0008756, "Trees growing under bridges prevent bridges from being used" they should not.
2015-07-14 12:04   
It depends what part of the tree is at "bridge level". Thick branches are walkable. Twigs are not. Trunks block the tile.

Since the bridge was serving as a roof, dwarves were not frequently pathing over it.

Although I believe the problem summary is quite sufficient, I did upload this fortress for a different bug report; you can access it here: http://dffd.bay12games.com/file.php?id=10678 [^]
2015-07-14 23:47   
Oh, so the pathing is just subject to different parts of tree that are in the way. I read 0008756 as "all tiles of bridge are now unaccessible after tree grow under it" but maybe Deboche just got lots of twigs there.