By Jon Herskovitz
KESENNUMA, Japan (Reuters) - Fuel shortages, icy rain and power outages are hampering Japan's worst humanitarian crisis since World War Two, but relief workers are reporting some progress as mangled roads are reopened and new homes built.
The sheer numbers in the world's costliest natural disaster -- estimated at $250 billion -- remain staggering. There are about 21,000 dead or missing, 319,000 people evacuated, 2,131 makeshift shelters, 2.4 million people without access to water and 221,000 households without power.
"There is some improvement in terms of logistics and in getting food and other supplies," said Francis Markus of the International Federation of Red Cross and Red Crescent Societies delegation in Tokyo.
"But it is still very difficult."
Rain grounded helicopters delivering relief supplies this week, forcing authorities to rely on roads and delaying aid, said the U.N. Office for the Coordination of Humanitarian Affairs. Access to water "remains a concern" in 11 prefectures, it added.
Makeshift evacuation centers, packed with hundreds of shell-shocked survivors sleeping side-by-side for more than a week, are orderly but clearly deteriorating in some regions, beset by cases of diarrhea, influenza, stress and fatigue.
"The only thing we can do is stick it out," said Takeshi Murakami, 67, in Kesennuma in devastated Miyagi prefecture whose governor reckons as many as 15,000 people were killed by the March 11 quake and tsunami.
Murakami is staying in a school gym with about 450 others, down from a peak of about 800 people last week. Hastily gathered possessions are folded in tidy bundles next to sleeping bags. Most escaped only with the clothes on their back. Few have bathed since the 9.0 tremor.
Sleep at the shelter is often interrupted by the screams of an Alzheimer sufferer during the night. Evacuees use portable toilets outside the gym. In one section, the elderly lie on mats on the wooden floor, receiving intravenous drips.
Telephone companies provide free services at the gym, where an entire wall is jammed with notices posted by people seeking help to find the missing. Without television, there is little to do but talk, grieve and wait. Many huddle around heaters.
"There is no privacy but you have to get used to it," said Keiichi Kato, 49, who ran a children clothing's store before it was obliterated, replaced by four washed up fishing trawlers.
There is progress. The Tohoku Expressway connecting Tokyo with quake-hit areas has re-opened to trucks. In Rikuzentakata, where more than 80 percent of the estimated 8,000 households were swept away, temporary homes are now being built.
About 5.5 million meals, 380,000 blankets and 90,000 diapers had been distributed across the tsunami-ravaged region as of Monday, according to the U.N. Office for the Coordination of Humanitarian Affairs.
But it was unclear how many people these had reached.
An official at the Disaster Relief Headquarters in northern Iwate prefecture, where 45,687 people were living in evacuation centers as of Monday, said a shortage of fuel was preventing aid from reaching hard-hit remote areas.
"Relief goods are being sent to evacuation centers but because of a shortage of fuel there's certainly not enough and there are places that goods are not reaching," he said.
"There are many places without electricity," he added. "Some people (in evacuation centers) are becoming ill."
The U.N. humanitarian office reported trouble caring for the disabled, especially the hearing impaired who in high-tech Japan rely on e-mails sent by mobile phone to communicate. Much of the mobile phone network remains down.
"The psychological toll on those who survived the disaster and are now in evacuation centers is becoming more apparent. Many evacuees, including children, are suffering from post-traumatic stress disorders," the U.N. agency said.
It is unclear how long people will stay in the shelters. An exasperated Yoshihiro Murai, governor of Miyagi, last week asked earthquake and tsunami victims to leave the prefecture due to a shortage in housing. Some are quietly heeding his call.
About 10,000 people, on average, are leaving evacuation centers a day, according to U.N. data. The Red Cross's Markus said many are heading to homes of people not affected by the disaster who have offered to take in survivors.
(Writing and additional reporting by Jason Szep; Editing by Jeremy Laurence)