WAIMANALO, Hawaii - Moving up the east side of Oahu, flooding in Waimanalo not only swept through businesses and homes. The force of the water even tore apart a vital roadway.

The cleanup went on all day Saturday after torrential rains tore through many parts of the island Friday night, including Waimanalo. 

Resident Wilson Ho described, "When it thundered, it sounded like a plane crash."

Homes were a muddy mess after flash floods tore through.

Another Waimanalo resident, Keoki Stender, told us the bridge near his home floods every time it rains hard. Friday night, he shot photos of firefighters who blocked the road and assisted drivers whose cars stalled trying to cross two foot high water.

Those rains also damaged part of a major road going through Waimanalo - Kalanianaole Highway. A SUV-sided potion of the shoulder of the highway (nearest Nalu Street) eroded completely away on Friday night. 

Underneath the asphalt is all sand. Residents we talked to say they are concerned that could cause further erosion and a dangerous situation, like a sinkhole.

Ho called the police to let them know about this damage. "I am overwhelmed at the danger it could cause to people coming through. The last thing we want is somebody to get hurt."

Ho has lived in the area his entire life. He says this is the worst rain damage to the roads he's ever seen. "I'm asking for immediate help to fix this," he says. 

Besides safety issues, Ho says if the road erodes more and closes one lane, that would be a traffic nightmare.

The state says Kalanianaole Highway from Kailua to Aina Haina is affected. It has several crews working around the clock, through the weekiend, to repair the damages.