Chinese authorities say nearly 400 dams were damaged by Monday's massive earthquake, according to media reports, as efforts to relieve the pressure at a dam near one quake-hit city continue.

Two thousand troops have already been sent to the Zipingpu dam, near Dujiangyan City, after state-run media said that it had "severe cracks. A probe later revealed that the dam is stable and safe, state news agency Xinhua reported.

The waters at Zipingpu are now being lowered to decrease pressure on the structure, according to business news magazine Caijing, The Associated Press reported.

The agency also reported the economic planning agency as stating that almost 400 mostly small dams had been affected by the 7.9-magnitude quake, while the Ministry of Water Resources has ordered a check on reservoir facilities throughout the nation.

International Rivers, a U.S.-based group which says it opposes "destructive dams and the development model they advance," alleges on its Web site that experts at China's Earthquake Bureau warned eight years ago that Zipingpu dam was at risk due to its closeness to significant geographic faultline. The Chinese authorities have not responded to the comments.

News of the reservoir damage came as it emerged that more than 4.3 million homes have now collapsed or sustained damage from the disaster, according to the Chinese Embassy in Washington, with the official death toll from the quake reaching 14,866 by Wednesday evening. But casualty figures from various cities indicate a higher number of dead.

The state-run Xinhua news agency has provided death tolls for eight communities in Sichuan province that add up to nearly 20,000. They include roughly 7,700 who perished in the town of Yingxiu, near the earthquake's epicenter. CNN cannot independently confirm the tallies.

Chinese Prime Minister Wen Jiabao Thursday ordered 90 more helicopters for rescue missions in Sichuan province, as mudslides, debris and fallen rocks blocked rescuers and aid workers from reaching quake-hit areas, Xinhua reported. Thursday's order brings the total to 110.

Rescuers continued their attempts to save those trapped beneath the rubble at schools, businesses and homes.

Aftershocks at times forced rescuers to turn away from the fallen buildings, leaving crowds frustrated without knowing the fate of loved ones. Video from one disaster scene shows a woman clinging to a crane after rescuers suspended a mission at a crumbled building, making the site too dangerous to enter.

But there were scattered stories of survival. A three-year-old girl was rescued from beneath a toppled building in Sichuan's Beichuan County Thursday, Xinhua said. Photos of the rescue showed the girl sustained a leg injury, but was otherwise alert.

A frightened seventh-grade girl was pulled safely from the rubble of a school dormitory Wednesday evening -- 50 hours after she was buried by Monday's earthquake, state-run media said.

In a weak voice, the trapped girl called out to one of the rescuers, "uncle, save me, save me," he said. "If anything (bad) had happened to her, the voice could haunt me for the rest of my life."

The girl rescued at Muyu Middle School in Sichuan province was among 89 children pulled from the rubble alive. At least 201 students were killed when the building collapsed while many were napping, according to China.org. More than 100 children escaped from the school in Qingchuan County, and rescuers were searching for an unspecified number still believed to be trapped.

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