Building bridges in SimCity 3000 sometimes doesn't work out as it should. These are some of the reasons why bridges won't connect properly, or at all:
There are buildings near the site where the bridge platform begins.
You did not start the bridge far enough back from the water.
Building bridges over surface water
Correcting these problems:
When roads and highway bridges are built, they will raise the terrain around them by, I believe, 2 tiles to the left and right, and 3 tiles away from the water. If there are structures within this area, a message will come up telling you that, and the bridge will not build.
Road bridges must start 5 tiles back from the water and be dragged to 5 tiles away on the opposite shore for the cursor to turn blue. Highways take 4 tiles. Also bridges cannot be built on slopes steeper than 45 degrees.
Bridges won't be build over surface water. Instead, the road will raise the terrain a tile so that it is even with the ground, then build a regular road over it. If you really want a bridge, just because it'll look nicer, you must lower the terrain where the water is first.
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