The parts may not fit together, it may be too long, too short, too wide or too narrow. It could fall down. It will likely take time and cost money to fix.
Bridge-It happened in 1984.
Tjörn Bridge happened in 1980.
Battle of the Bridge happened in 634.
Norton Bridge happened in 2003.
Silver Bridge happened in 1967.
Bridge Builder happened in 2000.
Angers Bridge happened in 1850.
Brooklyn Bridge shooting happened in 1994.
Bull bridge accident happened in 1860.
Collapse of Can Tho Bridge happened in 2007.
Maccabiah bridge collapse happened in 1997.
Battle of Radcot Bridge happened in 1387.