Drop dirt on the left side of the tile off the end, when its above water, flatten the tile, repeat until both front corners of the tile are above water.
<li>Single Tile Width (Not wasted dirt! More time consuming.)</li>
Plan...
<pre> a b e
+---+---+---+
land| 1 | 2 | 3 |water
+---+---+---+
c d f</pre>
<ul>
<li>Tile 1 (flat) already is flattened and in all 4 sides has 0 dirt slope.</li>
<li>Tile 2 (flat) both sides already are in water with 41 dirt slope.</li>
<li>Tile 3 (30 dirt slope to water).</li>
</ul>
How to flatten tile 3.
<ul>
<li>1. Drop 16 dirt on tile 1 a corner.</li>
<li>2. Drop 16 dirt on tile 1 c corner.</li>
<li>3. Flatten tile 1.</li>
<li>4. Flatten tile 2.</li>
<li>5. Start flattening tile 3 until tile's 2 corners e and f will be in water level or tile 2 slope will be 20 dirt.</li>
<li>6 . Flatten tile 1.</li>
</ul>
Start everything from step 1 until all 3 tiles will be flat.
Process explanation.
So where is the secret? Very simple, first you rise tile 1, then with flattening help you move dirt to tile 2 and then to tile 3.
This way of land bridge building is good when you don't have enough place to build 2 tiles wide bridge or you don't want to spent rest wurm life by diging dirt for 2 tiles wide bridge.
<li>Double width (No wasted dirt!)</li>