HOUSTON — They found Jill Renick’s dog, Sweet Pea, at the Omni Houston Hotel. They found her car. But they did not find Ms. Renick until Thursday — 11 days after she went missing.

Ms. Renick, a spa manager at the hotel, was among the workers who decided to ride out Hurricane Harvey there on the night of Aug. 26.

Floodwaters began filling up the basement of the building the next morning before dawn, according to Ms. Renick’s sister, Pam Eslinger, who said she had spoken about the matter with the Omni hotel management. At 5:40 a.m. Ms. Renick, 48, called the front desk and reported that she was stuck in an elevator, with the water rising around her.

For days, the hotel management, and the police, told Ms. Eslinger that they were unable to find any trace of her sister. On Thursday, Capt. Mark Lentini of the Houston Police Department said that a body presumed to be Ms. Renick’s had been discovered in the ceiling of the basement near the elevators.

“It is with heavy hearts that the search for my sister, Jill Renick, has concluded with the confirmation of her death,” Ms. Eslinger said in a statement. “We are heartbroken.”

Nearly two weeks after Harvey made landfall in Texas, 22 people remain missing, presumably as a result of the storm, and are being actively sought by investigators from the Police Department. They include a journalist who was recently diagnosed with dementia, and a 23-year-old woman who had worked with disabled children. They are professional people and homeless people, young adults and seniors. Two of them are children.

The roster is grim proof that things are still far from normal in Texas’ largest city, despite some superficial signs that it is bouncing back, with traffic again clogging wide freeways under blue skies and Tex-Mex restaurants in the luckier neighborhoods thrumming with business.

The storm slammed through a wide swath of East Texas far beyond Houston, and officials said this week that at least 63 deaths in the state were storm-related or suspected to be storm-related so far. But no one really knows yet how many people are missing across the state, partly because it is difficult to distinguish who went missing as a direct result of the storm, and partly because many local officials are overwhelmed by the post-storm chaos.

Some Texans have taken matters into their own hands, turning to the internet in their search of loved ones. The website for KPRC-TV, the Houston-area NBC affiliate, has been hosting an online message board where family members can post photos of the missing. Some of the posts feel desperate, with mere wisps of information. One shows a young person, with a face largely obscured by a hat brim, and a line of text that reads “Curong Trinh, lonestar college university park.” Another shows a man in a yellow shirt, standing awkwardly in the shade of a tree. He is identified as Adam Felix Helm, 52. “This is my brother,” a caption reads. “He has schizophrenia and his last known address was 6229.” The message ends there.