Tropical cyclone Cempaka which occurred on December 28 and 29 November 2017 causes huge waves on the sea, high winds, flooding, landslide. Damage to the infrastructure of the river also occurred due to flooding caused by the intensity of the rains is high in all districts and towns in Yogyakata special region. Gajah Wong River which is one major river crossing in the Yogyakarta region also affected due to tropical cyclone Cempaka. an assessment that aims to find out the condition of the Gajah Wong River infrastructure post tropical cyclone Cempaka needs to be done. Not only knowing the condition of the infrastructure of the river alone but it also asesemen to know the land boundary limits and gradations at Gajah Wong River. The methods used in the peneilitian this is the way the survey directly into the field to find out the condition of the morphology as well as the border of the river. The results showed that there are some infrastructure Gajah Wong river suffered damage, but the functions of the infrastructure is still good and the boundary conditions of the Gajah Wong River does not fit the rules, because it looks there are some survey time location that shows there is a settlement that stood on the boundary line of the river while the results of gradations of Gajah Wong River belongs to the graded good.