Golden Gate span is roughly 2 KM, though the approaches from the 2 ends add to that , 6 traffic lanes
sorta wide sidewalks with a bend around the towers. under it, 67m clearance at high tide

Astoria Megler bridge is actually 2 cantilever truss bridges , 1 over the International Shipping channel is higher,

there is a lower rise one on the WA side , 6.5 KM includes the causeway between them .. and is 2 lanes, + a bit on the edges.

60m clearance at high slack tide (most ship traffic is then)

anyone want to crowd fund a summer ferry to be built just to get bikes and people across?

the puget island- westport one is well upstream .. quite a ways.