I understand they pour concrete and use large bolts but how are they able to ensure the bridge remains stable? The ocean floor doesn’t seem too predictable so I’m curious how they confidently do this.
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If you can get to the ocean floor within a reasonable cost, it is as “easy” as pumping water out and plopping a concrete tower on bedrock.
Sometimes that’s cost-prohibitive, so cities in the Pacific Northwest put some their bridges on pontoons. Pontoons are made of concrete, float in the water, and are attached to the bottom of the lake with steel cables. The bridge on top is designed to flex with the wind and tidal effects.
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