Obi, who inspected the Uga and Isulo erosion sites in Aguata and Orumba South local governments on Wednesday, however said such designs were made by preceding governments.
He said poorly designed roads lead to poor channelisation of flood water that consequently leads to erosion.
He blamed the Uga and Isulo erosions on poor channelisation of flood water by the contractors that handled both projects.
Obi said part of the measures his government took on coming to power was to make it compulsory that any road built in the state would be properly designed with adequate drainage system linked to the right discharge points.
At the Isulo erosion site already threatening to cut the Akpu-Ajalli-Isulo-Umunze road, the governor said the state government would inform the Federal Government of the threat.
Upon the revelation that some of the erosion sites he visited had been awarded in the past by the Federal Government, Obi said he would confirm the report before taking action.
Meanwhile, the governor has decried the collapse of infrastructure at the Basden Memorial Education Centre, Isulo, Orumba South Local Government.
Speaking while inspecting the facilities, Obi recalled that the school founded over 40 years ago had produced prominent Nigerians but regretted that neglect over the years had led to its decay.
He said the inspection was to see how his administration could resuscitate the facilities.