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People and rescue boats line a street at the east Sam Houston Tollway as evacuations continue from flooding in Houston, Texas, Monday, Aug. 28, 2017, following Tropical Storm Harvey. Floodwaters reached the rooflines of single-story homes Monday and people could be heard pleading for help from inside as Harvey poured rain on the Houston area for a fourth consecutive day after a chaotic weekend of rising water and rescues. (Melissa Phillip/Houston Chronicle via AP
People and rescue boats line a street at the east Sam Houston Tollway as evacuations continue from flooding in Houston, Texas, Monday, Aug. 28, 2017, following Tropical Storm Harvey. Floodwaters reached the rooflines of single-story homes Monday and people could be heard pleading for help from inside as Harvey poured rain on the Houston area for a fourth consecutive day after a chaotic weekend of rising water and rescues. (Melissa Phillip/Houston Chronicle via AP

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    CNN rides along with helicopter rescue team

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CNN rides along with helicopter rescue team

CNN's Brian Todd reports on the Customs and Border Protection team rescuing people from the floodwaters.

CNN rides along with helicopter rescue team

CNN's Brian Todd reports on the Customs and Border Protection team rescuing people from the floodwaters.