Step 1: Have your sticks make this shape(this picture ☝️)and glue them together and have paperclips hold them together.
Step 2: repeat step 1.
Step 3: after you have your bridge sides then you put some styrofoam in between them.
Step 4: Use the rubber bands to hold the bridges together.
Step 5: use the popsicle sticks and glue the two bridges together.
Step 6: after the glue dried you are done!