Northwest Pipe Company Awarded Largest Project in Company History

VANCOUVER, WA--(Marketwire - Jul 23, 2012) - Northwest Pipe Company (NASDAQ: NWPX), an industry leader of engineered welded steel pipe products, was selected to provide 45,950 feet of 84 inch and 113,600 feet of 96 inch cement mortar lined and polyurethane coated welded steel pipe for three sections of Lake Texoma Outfall to Wylie Water Treatment Plant Raw Water Pipeline Project. The pipeline will restore North Texas Municipal Water District's raw water supply which has been shut down since zebra mussels were found in Lake Texoma. The pipeline will transport raw water from Lake Texoma directly to NTMWD's existing Lake Lavon water treatment facility and will ensure NTMWD's member cities have an adequate supply of water.

"We are excited to be part of ensuring water supplies to NTMWD's member cities," said Gary Stokes, Senior Vice President of Sales and Marketing for Northwest Pipe Company. "The Lake Texoma Pipeline is going to have a significant positive impact on residents and provide viable water supplies to the area for years to come."

The 34,000 ton project will represent approximately $69 million in revenues for the Company. Production will begin in August 2012 and go through the middle of 2013.

"Northwest Pipe Company is delighted to be a participant in this major pipeline delivery system. The project is a significant part of our plans for 2012-2013," said Rich Roman, President and CEO of Northwest Pipe Company.

About Northwest Pipe Company
Northwest Pipe Company is a leading manufacturer of welded steel pipe and tube products. The Water Transmission Group is the largest manufacturer of engineered steel pipe water systems in North America. With five Water Transmission manufacturing facilities, the Group is positioned to meet North America's growing needs for water and wastewater infrastructure. The Water Transmission Group serves a wide-range of markets and their solution-based products are a perfect fit for applications including: water transmission, plant piping, energy, tunnels, river crossings, structural, industrial and construction. The Tubular Products Group operates three technologically-advanced ERW (Electric Resistance Weld) mill facilities. Tubular Products portfolio serves a wide-range of markets and its quality certified pipe and tube products are good for applications including: oil and gas, structural industrial, fire protection, low pressure and agricultural. The Company is headquartered in Vancouver, Washington and has manufacturing facilities in the United States and Mexico.

For more information, visit www.nwpipe.com.