The Alaskan Way Viaduct is a mile-long roof over the heads of Seattle's homeless people.
Every night, dozens bed down beneath its thick concrete haunches.
"People seek shelter under our highways in general," said Broch Bender, spokesperson for the Washington State Department of Transportation.
As WSDOT tears down the viaduct to build a tunnel, that makeshift roof is steadily being removed.
Now, in addition to finding new routes for the 110,000 cars that use the viaduct every day, workers are reaching out to the people who are being displaced. Over the summer, social workers from Evergreen Treatment Service's Reach program met with people camping underneath the viaduct to get them into shelter.
For some, it's been an unexpected blessing. At a defunct trolley stop near Alaskan Way and South Main Street, a 45-year-old man who declined to give his name hid from the pre-Thanksgiving rain. Before the work began, he and about nine people camped just south of the area, he said.
Social workers offered them a place to stay. Now, on rainy days the man stays dry under the viaduct, but every night at 6:30 p.m. he goes to Compass Housing shelter on Roy Street.
He sees it as a silver lining.
It worked out so well, he wondered if some spiritual force pushed him out of the viaduct and into shelter.
Cameron M. Christensen, who was staying at the same camp, said he also found shelter at Compass but he worries that people who live farther north in the viaduct's footprint won't be so lucky.
"There's not enough shelter space for all these people who are going to be displaced," Christensen said.
The City of Seattle's Human Services Dept. says they've got it covered.
"We've pledged to accommodate anybody who's coming out of encampments, especially those who have been cleared," said David Takami, Human Services spokesperson.
He said fewer than 200 people lived under the viaduct and he is confident the city and Reach can find shelter for any of them.
But even if they have a place to sleep at night, people who lived outside are still hanging out under the viaduct, said Reach social worker Ysi Ramos. The front doors of Compass Housing's main office open out onto the viaduct. In December, two-way traffic diverted from Highway 99 will run right in front of those doors.
Bender said people need to find other places to congregate. As construction continues, Alaskan Way South -- which also runs under the viaduct -- is going to get more dangerous.
"Soon, we're going to be working around the clock," she said. "It's not going to be a very hospitable place for campers."