The city of Sierra Vista is spending about $1.2 million on annual street maintenance projects before monsoon season, and drivers need to know where to expect closures and detours.Coronado Drive is currently closed at Avenida Cochise and Goldstone Street while crews work on about 9 patches along the road.Angela Dixon-Maher, senior civil engineer for the city of Sierra Vista, said the repairs were urgently needed."What we started to have were some…