Prefabricated bridge including steel abutments

A supported bridge, comprising:

• a prefabricated bridge including a deck supported by a plurality of steel girders extending in a spanwise direction along the supported bridge, wherein the deck is supported above the plurality of girders;
• and
• first and second steel abutments extending underneath the plurality of girders in a direction transverse to the spanwise direction, wherein the first steel abutment is located toward a first end of the prefabricated bridge and the second steel abutment is located toward a second end of the prefabricated bridge, each abutment including a beam and a bottom plate, the beam including an upper flange, a lower flange, and a web connecting the upper flange and lower flange, wherein the bottom plate is mounted at a bottom surface of the lower flange and has a width that is at least 1.5 times as great as a width of the lower flange,
• the first steel abutment includes a stiffener toward each end and one or more intermediate stiffeners located at intermediate points along the length of the first steel abutment, wherein at least one intermediate stiffener is vertically beneath a connection zone between one girder and the first steel abutment, and
• the second steel abutment includes a stiffener toward each end and one or more intermediate stiffeners located at intermediate points along the length of the second steel abutment, wherein at least one intermediate stiffener is vertically beneath a connection zone between one girder and the second steel abutment.