OMAHA, Neb., April 22, 2015 /PRNewswire/ - Valmont Industries, Inc. , a leading global provider of engineered products and services for infrastructure and mechanized irrigation equipment for agriculture, reported first quarter sales of $670.4 million compared with $751.7 million for the same period of 2014. First quarter 2015 operating income was $57.7 million versus $98.8 million in 2014.