Let the melting begin. City of Memphis crews are now shifting focus to filling potholes that were left in the wake of last week's winter storms. They're asking residents to call 311 to report any. The head of public works for the city, Robert Knecht, says 16 crews will be tackling the broken road infrastructure, double the number that work on the issue during some seasons. Typically, crews can respond to a notice within 3-5 days , but Knecht says that may be extended to 5-10 days because of the high volume ancicipated. From Sunday, Feb. 21 "Until further notice," reads MLGW's latest -- Sunday, Feb. 21 -- advisory to boil water before drinking it. The utility says the precautionary measure is necessary because of low water pressure due to frozen wells and broken water mains. Stagnant or slow moving water may breed pathogens, though none has yet been detected.