Supyogyo, Stone bridge in Jangchung-dong, South Korea.

Supyogyo is a stone bridge that crosses Cheonggyecheon stream and displays traditional construction methods from its era. It measures approximately 28 meters long and 8 meters wide.

Supyogyo was first built in 1410, the second year of King Sejong's reign, and was originally called Majeon Bridge after a nearby horse market. In 1441 a water gauge (supyo) was erected beside it, and after repairs in 1760 the bridge became known as Supyogyo. It was removed during the 1958 Cheonggyecheon covering works and moved to Jangchungdan Park in 1965.

The bridge earned its name from its role as a water measurement station, allowing people to understand and respond to flood warnings based on marked stone gauges.

Supyogyo stands in Jangchungdan Park, not at its original Cheonggyecheon site; a temporary bridge now occupies that spot. The park is in Jangchung-dong, near the Jangchungdan Memorial Shrine, and can be reached on foot from nearby streets. Look for the bridge among the park grounds.

The bridge contained a measurement system with stone markers in cheok units that triggered official alerts when water levels exceeded nine cheok during floods. This system was an early form of flood management in the region.