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The first temple to Poseidon was built at Isthmia around 700 BC. The site at the Isthmus was a natural spot for the structure, since there were many ports nearby that served maritime traders. Around 480 BC, the archaic temple was destroyed by fire, and a new, larger temple in the Doric style was constructed in its place. In 390 BC, a Spartan Army marched on the Isthmus and damaged the temple again. The Doric building had a parastyle consisting of 7 x 19 wooden columns and measured ca. 38.10 by ca. 13.411 m at the stylobate; the Cella was ca. 7.70 by ca. 32.28 (?) m. The exterior walls were painted stone panels. After the archaic temple was destroyed by fire, a new temple, also Doric, was built to replace it. The new temple had 6 x 13 columns, and was erected before 450 B.C. The temple was again severely damaged by fire in 390 B.C., it was restored and remained standing until Early Christian times.
The temple floor plan was reconstructed as part of excavations conducted in 1989. There is little that remains of the structure other than the stylobate.
Archaic period temple of Poseidon at Isthmia
The column height is based off of the statistical probability. The interaxial length is divided by the sum of means (6.11) to arrive at the estimated height, 8.4936 meters. It falls exactly where it shuld for 6 13 type temples.