There is also Ma-jeon-gyo(Bridge) which is generally known as Supyo-gyo across the Cheonggyecheon(stream flows center of Joseon Era's Seoul City(Inside area of the Seoul wall), near the Gyungbok Palace).
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The generally known name originated from the Supyo-seok attached on the pier of the bridge, and the Supyo-seok's meaning and function is "the water level gauge" of Cheonggyecheon, telling how much the stream's water level is risen by a rain.
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But, unfortunately the plan can't be fulfilled, cause there was a difference between the restored width of the Cheonggyecheon and the Bridge's length.