U.S. Gulf of Mexico oil output levels rose slightly from Saturday, when roughly 25% of Gulf oil output was offline, Reuters reported. About 3% of that production came back online Sunday, Aug. 27, leaving 22% offline, according to the U.S. Department of the Interior's Bureau of Safety and Environmental Enforcement (BSEE).

The amount of production offline on Sunday was roughly 378,633 bbl/d out of the roughly 1.75 MMbbl/d pumped from the Gulf.

About 26% of Gulf natural gas production is offline, or about 828 million cubic feet (23.4 million cubic meters) per day, BSEE said.

Roughly 105 platforms have been evacuated in the Gulf so far as a result of Harvey, about 14.3% of those in the region. Half of the drilling rigs in the Gulf remain evacuated, BSEE said.

BSEE tabulates the data by polling 30 Gulf operators.