More than 10,000 residents were evacuating their homes in Michigan on Wednesday after two dams failed following heavy rain and triggered what officials warned will be historic flooding.

Governor Gretchen Whitmer declared a state of emergency in Midland County, site of the breached dams, in the towns of Edenville and Sanford. Whitmer had warned that the city of 42,000 people could end up under nine feet (2.7 meters) of water by Wednesday evening after floodwaters overtook two dams and forced the evacuation of about 10,000 people from their homes.

Meanwhile, the Tittabawassee River crested at just over 35 feet (11 meters) in Midland, about three feet (90 centimetres) below the forecast level. The National Weather Service said communities farther downstream were bracing for flooding in the coming days.

Floodwaters surging through Central Michigan were mixing with containment ponds at a Dow Chemical Co. plant and could displace sediment from a downstream Superfund site, though the company said there was no risk to people or the environment.

Dow said the ponds held only water, and it has detected no chemical releases from the plant in Midland where the company was founded, though the U.S. Environmental Protection Agency said state officials would evaluate the plant when they're able. Once the flooding recedes, Dow will be required to assess the Superfund site — contaminated with dioxins the company dumped in the last century — to determine if any contamination was released, the EPA said.

No injuries or fatalities related to the flooding have been reported, Midland spokeswoman Selina Tisdale said.

Residents near the river were urged to seek higher ground following what the National Weather Service called "catastrophic dam failures" at the Edenville Dam, about 20 miles (32 kilometers) northwest of Midland, and the Sanford Dam, about 8 miles (13 kilometers) downriver.

Midland City Manager Brad Kaye said Wednesday that the Sanford Dam is overflowing but that the extent of structural damage isn't yet known.

If the entire dam structure were to fail, "There would be a much higher surge that will come down the river and that could raise the level much more quickly than what we're seeing right at the moment," Kaye said.

In nearby Edenville, Bob Yahrmarkt, 79, evacuated his home along the river on Tuesday afternoon. He said he couldn't believe what he saw when he returned Wednesday. "Just devastation," said Yahrmarkt.

His garage, which housed tools and equipment he amassed over 70 years, was swept away. His home was heavily damaged by water: It has three levels — two beneath the main floor, which itself was more than a foot underwater.

"I'm looking at a sand pile and concrete where the garage was," Yahrmarkt said, noting that floodwaters also pushed his antique 1953 Ford sedan and a Harley-Davidson motorcycle around in his yard.

His neighbor, 58-year-old Dan Dionne, returned home to find everything beneath his home washed away.

"I never saw nothing like this," Dionne said. "We had a flood before, but nothing like this. It's like someone picked up my garage and shook it. There's a freezer, refrigerator in my backyard. I don't know where it's from."

The river topped a previous record of 33.9 feet (10.3 meters) set in 1986, the National Weather Service said. Its flood stage is 24 feet (7.3 meters), and it had been expected to crest at about 38 feet (11.6 meters).

Whitmer declared a state of emergency for Midland County, and the towns of Edenville, Sanford and parts of Midland were evacuated, Tisdale, the Midland spokeswoman, said. Midland is about 130 miles (210 kilometers) north of Detroit.

The governor said her office had been in touch with federal officials and would ask the Federal Emergency Management Agency for support.

"This is an event unlike anything we've ever seen before," she said.

President Donald Trump tweeted that he was closely monitoring the situation and praised first responders. But he also took a jab at Whitmer, whom he has criticized for her stay-at-home orders to prevent the spread of the coronavirus: "We have sent our best Military and @fema Teams, already there. Governor must now 'set you free' to help. Will be with you soon!"

The state has been a national hot spot for COVID-19, with more than 52,000 cases and 5,000 deaths, but Midland County has had fewer than 80 cases and under 10 deaths. Still, residents were advised to take precautions and schools set up as shelters spaced cots to adhere to social distancing guidelines.

Whitmer said the state would investigate the operators of the dams and "pursue every line of legal recourse we have."

"The initial readout is that this was a known problem for a while and that's why its important that we do our due diligence," Whitmer said.

(With input from agencies)