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A low-water crossing (also known as an Irish bridge or Irish Crossing, causeway in Australia, low-level crossing or low-water bridge) is a low-elevation roadway traversing over a waterbody that stays dry above the water when the flow is low, but is designed to get submerged under high-flow conditions such as floods.
Fords may be impassable during high water. A low-water crossing is a low bridge that allows crossing over a river or stream when water is low but may be treated as a ford when the river is high and water covers the crossing. The word ford is both a noun (describing the water crossing itself) and a verb (describing the act of crossing a ford).
A floodway is a flood plain crossing for a road, built at or close to the natural ground level. [1] It is similar to a causeway, but crosses a shallow depression that is subject to flooding, rather than a waterway or tidal water. [2] They are designed to be submerged under water, but withstand such conditions.
St. Lucie Lock and Dam on the Okeechobee Waterway, approximately 15 miles (24 kilometres) southwest of Stuart, Florida.According to the lock webpage by the U.S. Army Corps of Engineers, the lock chamber is "50 feet wide x 250 feet long x 10 feet deep at low water", [2] showing that the design of the canal system and waterway is for shallow barges and not a ship canal.
Sudden road collapses are often the result of poorly designed and engineered culvert crossing sites or unexpected changes in the surrounding environment cause design parameters to be exceeded. Water passing through undersized culverts will scour away the surrounding soil over time. This can cause a sudden failure during medium-sized rain events.
Unlike bridges, stepstone crossings typically have no spans, although wood planks or stone slabs can be placed over between the stones (which serve as the piers) to improvise as low-water bridges. Although their historical origin is unknown, stepping stones, along with log bridges , are likely to have been among the earliest means of crossing ...
Throughout the design and build process, concerns were expressed by elected officials and residents over the environmental effects of such a bridge, particularly the possibility of concrete pillars being driven into the lakebed. [5] The bridge was redesigned in 1978 as a tied-arch bridge to avoid placing pillars into the water. [6]
Low water crossing, a non-moving bridge that is sometimes submerged; Moveable bridges for a list of other moveable bridge types; Table bridge, a similar bridge that moves upward; Underwater bridge, a non-moving military bridge that is always submerged