VANCOUVER, WA--(Marketwire - April 30, 2008) - Northwest Pipe Company (NASDAQ: NWPX) reported today that it has received a verbal commitment from Reynolds-Tierdale of Denver, Colorado to supply pipe for the Prairie Waters Project for the City of Aurora, Colorado.

The Company will supply approximately 68,000 feet of 60" steel pipe valued at approximately $22 million for an engineered and custom fabricated piping system. The pipe is expected to be manufactured in the Company's Denver, Colorado division with delivery scheduled to begin in the third quarter of 2008.

The Prairie Waters Project is designed to provide a reliable supply of high quality water to the City of Aurora by drawing water from the South Platte River through collector wells. It will be delivered to nearby natural purification basins where its movement through sand and gravel will take it through a natural cleansing process. The water will then be piped 38 miles south to the Aurora Reservoir where it will be treated at a new water purification facility. It is anticipated to deliver up to 10,000 acre feet of water by 2010 and up to 15,000 acre feet by 2012. The Prairie Waters Project is projected to provide enough additional water to meet the city's demands into the 2020s.

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 Vancouver, Washington 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 360-397-6250