A deck arch is a type of arch bridge in which the bridge deck (roadway) is supported by the arch, which is located below the deck. The arch is usually composed of several arch ribs that span between piers or abutments.
On the other hand, a through arch is a type of arch bridge in which the bridge deck passes through the arch, which is located above the deck. The arch is usually composed of a single arch rib that spans between the abutments or towers.
The main difference between these two types of arches is the location of the arch relative to the bridge deck. In a deck arch, the arch is located below the deck, while in a through arch, the arch is located above the deck.
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