Draw two parallel horizontal lines for the bridge deck
Add vertical supports beneath the deck
Sketch the bridge towers or arches, depending on the style
Connect the towers or arches to the deck
Draw diagonal cables if making a suspension bridge
Add railings along the top edges of the deck
Extend the bridge ends to meet the land on both sides
Draw the roadway surface with light perspective lines
Add water, ground, or river beneath the bridge
Include reflected shapes or shadows under the bridge
Refine the structure with straight, clean lines
Erase unnecessary sketch marks
Add texture details like beams, panels, or stone blocks
Shade the bridge to show depth and form