PORTLAND, OR--(Marketwire - December 13, 2007) - Northwest Pipe Company (NASDAQ: NWPX) announced today the acquisition of substantially all the operating assets of S Square Tube Products relating to their perforated square tubing business. S Square is located in Commerce City, Colorado.

S Square Tube Products manufactures a variety of products used in the traffic industry. Their primary product is square perforated tubing which is commonly used as a traffic sign post.

"The S Square acquisition demonstrates our continued commitment to our traffic products business," said Brian W. Dunham, Northwest Pipe Company's CEO. "It continues our strategy of strengthening successful product lines. We believe the traffic products industry presents attractive growth opportunities for our Tubular Products business."

Northwest Pipe Company manufactures welded steel pipe and other products in three business segments. Its Water Transmission Group is a leading supplier of large diameter, high-pressure steel pipe products that are used primarily for water infrastructure in North America. Its Tubular Products Group manufactures smaller diameter steel pipe for a wide range of construction, agricultural, energy, industrial and mechanical applications. Its Fabricated Products Group manufactures propane tanks and other fabricated products. The Company is headquartered in Portland, Oregon and has ten manufacturing facilities across the United States and Mexico.

This release contains forward-looking statements, including but not limited to those regarding the project described above. These statements reflect management's current views and estimates of market circumstances, industry conditions and Company performance. Actual results could vary materially from the description contained herein due to many factors including market demand, operating efficiencies, availability and price of raw materials, and other risks described from time to time in the Company's reports to the Securities and Exchange Commission.

Contact Information: For more information, contact: Brian Dunham 503-946-1200