According to this old link ( www.window.state.tx.us/tpr/btm/btmtr/tr13.html ) with 1991 figures, it cost $1.2 million per year to operate the ferry and it would cost over $88 million to build a bridge. The document does not say that it is technically impossible to build a bridge, but it does mention that there would be a minimum height requirement due to the tall ship traffic.
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Port Mann Bridge :-)
A bridge can filter, forward based on its MAC address forwarding table. The bridge will note any MAC address that is the source address on a frame and the port that the frame was received. Then it will forward or filter depending upon the forwarding table. If a MAC address is found on more than one port (because of loops in the network) then the frame is forwarded on both ports. If a frame is received on a port and the destination MAC address is only found on that port then the frame is filtered and discarded. If the destination MAC address is not found in the forwarding table, then the bridge will flood the frame out all ports except the receiving port. A router will build a routing table based on the routing protocol that is being used in the router. The routing protocol (RIP, RIPv2, AS-AS, OSPF etc) will have a method of identifying the best route to send the IP packet to the destination. When an IP frame is received then it will be routed on the best route to the destination
The West Gate Bridge is a cable-stayed bridge.
The Chelsea Bridge is a suspension bridge. Similar to the Golden Gate Bridge in San Francisco.
Brooklyn Bridge