Supported from below, the most common type of bridge utilizes a series of deep beams or trusses anchored at each end of the span. However, because of the clearances under the span required by the railroad, the bridge deck elevation would end up being almost 35 feet above the street.

In order to substantially decrease the distance from the street to the bridge deck, the thickness of the structure must be minimized. Constructed of conventional means, this would prove both impracticable and uneconomical. The thickness required to reduce the height is a fraction of that found in a conventional span. Without any additional system of support, the deck would sag, or deflect. To meet the design criteria, the additional system of support would not thicken the deck or obstruct the required clearances below.

Hanging the deck from above was the best way to meet the design criteria. In a typical cable-stayed bridge, a thin deck is supported symmetrically from above by cables connected to a mast.

Site constraints, utility configurations as well as complex and overlaying easements offered the opportunity to develop unique design and cable geometry. Our solution places the mast to one end of the bridge and arrays the cables from the mast to both the bridge deck and grade, This design employs the thin deck structure reducing the elevation from the street by 10 feet.