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LITTLE ROCK, Ark. (KTHV) - Power crews are making progress in restoring power to customers who lost it when Isaac swept through Arkansas on Thursday.

At its peak, more than 16,000 Entergy customers were in the dark. As of Friday night, over 4,700 customers remained without electricity.

The utility company shows Mississippi County has the highest number of outages, with more than 2,000 still in the dark. 

Entergy - which serves customers in Arkansas, Louisiana, Mississippi and Texas - says Isaac has been the utility's fourth-largest storm in terms of power outages.

The state's largest electric utility has crews assessing damage and restoring power as conditions allow it to be done safely.

HOT SPRINGS, Ark (KTHV) -- Entergy Arkansas is lowering the levels of Lake Hamilton and Lake Catherine as a precaution in preparation of Isaac.

Hot Springs Public Works Director Denny McPhate says they tested their flood warning system in downtown Hot Springs Wednesday afternoon.

"We're going to do an audible and then we'll do a voice that says it's a test. Ready to go!" says McPhate.

It's a sound he wants to hear Wednesday because he and his crew are making sure emergency signal is ready for storms -- and flooding-- like Isaac could bring to Hot Springs.