Make the triangle pieces. These will be used on both bridges. Make 11 of them.
Take the triangle pieces and connect them together. Four on each side. The remaining three will be used on Bridge B.
Lay out four popsicle sticks put two right next to each other in the middle and one on each side away from the two sticks. They should only be the length of one popsicle stick. Take one poepsicle stick and place it so it is diagonal. Then do this to the other side. Attach a popsicle stick across the whole thing to hold it together.
Now that you have the triangle pieces made put four in a row and attach them using the popsicle sticks.