Of course there are bridges in and around Greater LA Area. However, it most an urbanized land mass.
Cities like Seattle, Portland, SF, NYC, Montreal, Boston & Vancouver require an extensive bridge & or tunnel system to keep each region effectively connected.
https://dailyhive.com/vancouver/vancouver-lions-gate-ironworkers-bridge-ship-collision-collapse-risk
Vancouver & the metropolitan area already has a deficit of adequate bridges. There should have been about a dozen bus & bike bridges over the past few decades. Improved existing bridges to allow for HOV lanes, but Vancouver & the greater region are too afraid to go beyond the chokepoint mentality. Apparently, congestive planning is always the best way to go in BC. There isn't enough bridge redundancy, so if anything goes wrong, the region will only get more blocked up.
https://dailyhive.com/vancouver/ironworkers-memorial-bridge-replacement
