Bridges

A bridge carries a route across an intervening space or obstacle. It can connect riverbanks, span a valley or take one road over another. The gap remains beneath the crossing, while the bridge supplies a way across it.

In everyday language, bridges frequently concern connection, access and continuity. Building a bridge, standing halfway across one and finding that a bridge has collapsed describe different relationships to the same crossing.

A bridge creates a continuous route while the gap between the banks remains. Original schematic comparison, CC0.

Types and Characteristics

• Beam bridges: Carry a deck on horizontal beams supported at their ends and, where required, at intermediate points.
• Arch bridges: Use a curved structure to transfer loads towards supports on either side.
• Suspension bridges: Carry the deck from cables supported by towers and secured at their ends.
• Drawbridges: Have a section that can be raised or moved to interrupt a crossing or permit passage beneath it.
• Footbridges: Provide crossings principally for pedestrians.
• Pontoon bridges: Carry a route on floating supports, making the crossing dependent on the water beneath it.

A bridge's width, condition, supports and approaches affect its use. A complete bridge can still be inaccessible if the route leading to it has been blocked.

Historical Background

The Iron Bridge across the River Severn at Coalbrookdale was erected in 1779. Thomas Farnolls Pritchard proposed a single iron arch, and Abraham Darby III undertook its construction. The design avoided placing supporting piers in the river, preserving the passage beneath the crossing. Ironbridge Gorge Museum Trust: The Iron Bridge

The bridge illustrates how one structure can support movement in two directions: travellers cross above while boats pass below.

Folktales

In The Three Billy Goats Gruff, the goats must cross a bridge to reach better grazing. A troll challenges them from beneath it. In Katharine Pyle's retelling, the smallest and middle goat each persuade the troll to wait for a larger one, and the largest defeats him. Katharine Pyle: Wonder Tales from Many Lands

The story presents a crossing that exists and can bear the travellers, but whose use is contested by another being. The physical structure and the threat associated with crossing it are separate features of the situation.

In Pyle’s retelling, the troll joins ownership of the crossing to a threat against its user:

for I’m the Troll that owns this bridge, and now I’m coming to eat you up.

Excerpt from the troll’s speech, Katharine Pyle’s “The Story of the Three Billy Goat Gruffs”, p. 62.

The bridge already provides a usable route. What obstructs the goat is an encounter at the crossing, not a missing span. The smallest goat gains passage by directing the troll’s appetite towards a larger expected traveller; he does not repair the bridge or settle access for everyone. That distinction also keeps the cost of his tactic visible: his immediate safety depends on proposing another victim. Only the largest goat’s confrontation changes the troll’s ability to threaten later crossings. Connection, permission and safety therefore need separate descriptions even when they concern the same structure.

Idioms

• Build bridges: Establish or improve connections between people or groups.
• Burn your bridges: Act in a way that prevents a return to an earlier relationship or situation.
• Bridge the gap: Reduce a separation or supply a missing connection.
• Cross that bridge when you come to it: Deal with a possible difficulty when it actually arises.
• Water under the bridge: A past event treated as settled or no longer worth disputing.
• A bridge too far: An undertaking that exceeds available capacity or goes beyond what can be achieved.

Wordplay

Bridge also names a card game and the raised area of a ship from which it is directed. These are established uses of the same word, not separate homophones.

Related Pages

Paths and Trails, Rivers and Civilisations, Valleys, Ships.

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