submersible bridge
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A submersible bridge is a type of
movable bridge A moveable bridge, or movable bridge, is a bridge A bridge is a Nonbuilding structure, structure built to Span (engineering), span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath. It is const ...
that lowers the bridge deck below the water level to permit waterborne traffic to use the waterway. This differs from a
lift bridge A vertical-lift bridge or just lift bridge is a type of movable bridge in which a span (architecture), span rises vertically while remaining parallel with the deck. The vertical lift offers several benefits over other movable bridges such as t ...
or
table bridge A table bridge is a moveable bridge A moveable bridge, or movable bridge, is a bridge A bridge is a Nonbuilding structure, structure built to Span (engineering), span a physical obstacle, such as a body of water, valley, or road, without ...
, which operate by raising the roadway. Two submersible bridges exist across the
Corinth Canal The Corinth Canal ( el, Διώρυγα της Κορίνθου, translit=Dhioryga tis Korinthou) connects the Gulf of Corinth in the Ionian Sea with the Saronic Gulf The Saronic Gulf (Greek Greek may refer to: Greece Anything of, from, or rela ...

Corinth Canal
in
Greece Greece ( el, Ελλάδα, Elláda, ), officially the Hellenic Republic, is a country located in . Its population is approximately 10.7 million as of 2021; is its largest and capital city, followed by . Situated on the southern tip of the , ...

Greece
, one at each end, in Isthmia and
Corinth Corinth ( ; el, Κόρινθος, Kórinthos, ) is the successor to an ancient city, and is a former municipality A municipality is usually a single administrative division having Municipal corporation, corporate status and powers of sel ...

Corinth
. They lower the centre span to 8 metres below water level when they give way to ships crossing the channel. The submersible bridge's primary advantage over the similar lift bridge is that there is no structure above the shipping channel and thus no height limitation on ship traffic. This is particularly important for sailing vessels. Additionally, the lack of an above-deck structure is considered aesthetically pleasing, a similarity shared with the Chicago-style
bascule bridge A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span (architecture), span, or leaf, throughout its upward swing to provide clearance for boat traffic. I ...
and the
table bridge A table bridge is a moveable bridge A moveable bridge, or movable bridge, is a bridge A bridge is a Nonbuilding structure, structure built to Span (engineering), span a physical obstacle, such as a body of water, valley, or road, without ...
. However, the presence of the submerged bridge structure limits the
draft Draft, The Draft, or Draught may refer to: Watercraft dimensions * Draft (hull), the distance from waterline to keel of a vessel * Draft (sail), degree of curvature in a sail * Air draft, distance from waterline to the highest point on a vessel ...
of vessels in the waterway. The term ''submersible bridge'' is also sometimes applied to a non-movable bridge that is designed to withstand submersion and high currents when the water level rises. Such a bridge is more properly called a low water bridge.


See also

*
Low water crossing A low-water crossing (also known as an Irish bridge, causeway in Australia, low-level crossing or low-water bridge) provides a bridge when water flow Water is an Inorganic compound, inorganic, Transparency and translucency, transparen ...
, a non-moving bridge that is sometimes submerged *
Moveable bridges A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats or barges. In American English, the term is synonymous with , and the latter is the common term, but drawbridge can be limited to the narrower, historical de ...

Moveable bridges
for a list of other moveable bridge types *
Table bridge A table bridge is a moveable bridge A moveable bridge, or movable bridge, is a bridge A bridge is a Nonbuilding structure, structure built to Span (engineering), span a physical obstacle, such as a body of water, valley, or road, without ...
, a similar bridge that moves upward * Underwater bridge, a non-moving military bridge that is always submerged


References


External links


''Popular Science'', November 1943, '' "Ducking Bridge" Lowers Span To Allow Ships To Pass''
built in Iraq in 1943 (bottom-right hand side of page)
Video of the operation of a submersible bridge at the entrance of the Corinth Canal
{{DEFAULTSORT:Submersible Bridge Bridges Moveable bridges Bridges by structural type