The death toll in storm-battered areas is rising as Hurricane Maria continued to barrel through the Caribbean on Friday, two days after its landfall in Puerto Rico left the U.S. territory battered and in the dark.
All available resources are being sent to evacuate people near Lake Guajataca, where a dam is in danger of breaking, Puerto Rico Gov. Ricardo Rossello said in a press conference Friday afternoon. An estimated 70,000 people could be affected. The National Weather Service warned of "imminent failure" and urged residents in the area to "move to higher ground now."
Maria remained a major Category 3 hurricane Friday as of 5 p.m. ET, with 125 mph maximum sustained winds. The storm's eye at the time was located 115 miles east-northeast of the eastern Bahamas, moving toward the northwest at 9 mph, according to the National Hurricane Center.
The death toll from the hurricane is at least 24, including 15 in Dominica, seven in Puerto Rico and two in Guadeloupe.
Maria came ashore in Puerto Rico early Wednesday as a powerful Category 4 hurricane with 155 mph winds -- the first Category 4 to hit the island since 1932. The storm wiped out the island's power grid and dumped 20 to 30 inches of rain in 24 hours, with some areas seeing 40 inches locally.
There is potential for the death toll in Puerto Rico to rise, the island's Secretary of the Department of Safety said Friday.
Although Maria has hurtled past the island, Puerto Rico will see heavy rainfall through Saturday from the storm's trailing rain bands, likely an additional 3 to 6 inches, according to the National Hurricane Center.
Water supplies on the island are down because of the lack of power, Rossello said. In addition, the water agency suffered "severe damage," he said.
Rossello has also extended a curfew and ban on alcohol sales on the island from 6 p.m. to 6 a.m. ET through Sunday.
New York Gov. Andrew Cuomo departed for Puerto Rico on Friday to bring donated supplies to the island and assess the need, after Puerto Rico's governor made a request for aid. Cuomo traveled with members of the National Guard as well as New York Congresswoman and Puerto Rico native Nydia Velázquez.
Residents of Puerto Rico's hard-hit north coast were seen wading through floodwater inside what's left of their homes.
Every vulnerable house should be considered "completely or partially destroyed," and every flood-prone area was damaged, Rossello said.
ABC News correspondents observed widespread destruction in the town of Guaynabo, about 10 miles south of San Juan where trees and power lines were downed and storefronts and building facades had crumbled. Neighborhoods in Guaynabo were filled with waist-deep floodwaters and destroyed homes that were apparently not built to any kind of code.
Guaynabo resident Ramon Caldero and his family hunkered down in their kitchen during the storm, which caused part of the ceiling to collapse in his sister's room.
Christy Caban of Nashville, Tennessee, rode out the storm with her husband and 13-month-old baby in their hotel room just east of San Juan.
Puerto Rico's emergency management agency confirmed that 100 percent of the island had lost power by Wednesday afternoon, noting that anyone with electricity was using a generator.
Abner Gomez Cortes, executive director of the agency, told ABC News more than 12,000 people are currently in shelters, and hospitals are running on generators. Two hospitals -- one in Caguas and one in Bayamon -- were damaged in the storm.
A spokesperson with the Puerto Rico governor's office confirmed to ABC News at least one person has died in the storm. The person was killed in Bayamon, just southwest of San Juan, after being hit in the head by a wooden panel.
Meanwhile, telecommunications throughout the island have "collapsed," Cortes said, describing the storm as unprecedented.
Multiple transmission lines sustained damage, according to Ricardo Ramos, director of the Puerto Rico Electric Power Authority. Ramos said he hopes to start launching helicopters by this weekend to begin inspecting the lines.
Rossello has imposed a curfew on the island Wednesday from 6 p.m. to 6 a.m. ET through Saturday.
Puerto Rico narrowly missed landfall by Hurricane Irma two weeks ago, with the Category 5 storm traveling just north of the U.S. territory. The island suffered heavy rain and wind, but nothing near the widespread damage incurred by Maria.
Speaking at the United Nations General Assembly in New York City on Thursday, President Donald Trump said Hurricane Maria "absolutely obliterated" the U.S. territory and "totally destroyed" its power grid, but that the recovery process will begin soon with "great gusto."
Puerto Rico “got hit with winds, they say they’ve never seen winds like this anywhere," Trump added.
Maria is expected to turn toward the north-northwest later Friday, then turn toward the north by late Saturday, according to the National Hurricane Center. That means the storm's core will move away from Turks and Caicos on Friday and pass near the Southeast Bahamas through Sunday.
The National Hurricane Center on Friday warned a "dangerous storm surge" coupled with "large and destructive waves" will raise water levels by as much as 9 to 12 feet above normal tide levels in parts of Turks and Caicos and the Southeast Bahamas. And through Saturday, Maria is expected to produce up to 20 inches of rain in parts of Dominican Republic and Turks and Caicos.
But Maria is forecast to gradually weaken during the next 48 hours and beyond due to higher wind shear as the hurricane moves into the cooler waters of the Atlantic Ocean. The diminishing storm will move between Bermuda and the eastern coast of the United States before heading further east and out to sea sometime next week, according to the latest forecast models.
The storm's path is still expected to steer clear of the U.S. mainland.
"At this point, I don’t think Maria will have any major impacts to the mainland besides the high surf and rip currents," ABC News senior meteorologist Max Golembo said Friday morning.
Maria also did severe damage to other Caribbean islands without making landfall.
Dominica's prime minister, Roosevelt Skerrit, told ABS Television on Thursday that at least 15 people have died and many homes are destroyed beyond repair. The death toll in the island nation is likely to rise and search and rescue missions are ongoing. At least 16 additional people are missing in some communities, he said.
“We have many deaths, but it is a miracle that we do not have hundreds of deaths in the country,” Skerrit told ABS Television.
The prime minister told ABS Television that his home's roof was ripped off during the storm and he had to take cover under a bed to protect himself from falling debris.
While wiping away tears during the emotional interview, Skerrit issued an urgent appeal for desperately needed aid, namely water, tarps and baby supplies.
Hartley Henry, an adviser to Dominica's prime minister, told reporters via WhatsApp on Wednesday that his country has suffered a "tremendous loss of housing and public buildings" since the storm hit, ripping off roofs and tearing doors from hinges. Dominica's main general hospital "took a beating" and "patient care has been compromised," he said.
"The country is in a daze -- no electricity, no running water," Henry said via a WhatsApp message. "In summary, the island has been devastated."
The Ross University School of Medicine, based in Portsmouth, Dominica, announced Wednesday on Facebook that it is attempting to make contact with all of its students. More than 1,400 students and faculty have signed the registration sheet so far, and the school has reached out to the family members of more than 700 others, who informed them that they are safe.
In Guadeloupe, officials announced Wednesday two people were killed and two others were missing in the storm's wake.
France's Interior Minister Gerard Collomb said some 80,000 people in Guadeloupe -- around 40 percent of the population -- were without electricity Wednesday. Many roads there are impassible due to flooding and French Navy planes have not been able to assess the damage on the island due to bad weather conditions.
In Martinique, about 70,000 homes were without electricity and 50,000 homes did not have access to safe drinking water Wednesday. Fallen trees and downed power poles have blocked many roads there, Collomb said.
Police and soldiers have been deployed in both Martinique and Guadeloupe to ensure security. More than 3,000 first responders are on the French Caribbean islands, according to Collomb.
The U.S. Department of State sent a message of solidarity Wednesday to the people of Dominica and all across the Caribbean who were affected by Maria.
ABC News' Benjamin Gittleson, Max Golembo, Melissa Griffin, Joshua Hoyos, Victor Oquendo and Paul Pradier contributed to this report.