(SJ) - Oregon’s wine industry had more than 500 wineries and production exceeded 50,000 tons in 2012, according to an annual report produced for the Oregon Wine Board.

The North Willamette Valley continued to dominate with about 73 percent of the wine grapes crushed in 2012. The Rogue Valley was the second highest producing region with about 10 percent of the total.

Southern Oregon University Research Center gathered the data for the Oregon Wine Board. Officials cautioned that changes in how the information was gathered may have skewed the results.

“We really did cast a broad net and queried more sources than we did in 2011,” said Gregory Jones, professor and research climatologist at SOU who supervised the census. “We believe that we did capture some underestimates from years past.”

For 2012, researchers counted 325 wineries in the North Willamette Valley, an area that includes the Salem area, areas north of Monmouth, Dundee and the Yamhill-Carlton District. That compares to 270 in 2011.

The Oregon Wine Board is a semi-independent Oregon state agency managing marketing, research and education initiatives that support the wine industry. The wine industry represents about $3 billion of economic activity annually, including the generation of more than 13,500 wine-related jobs, according to the Oregon Wine Board.