Willamette Valley - Agriculture

Agriculture

The agricultural richness of the valley is in part a result of the Missoula Floods, which inundated the valley approximately forty times between 15,000 and 13,000 years ago at the end of the last ice age. The floods were caused by the periodic rupturing of the ice dam of Glacial Lake Missoula, the waters of which swept down the Columbia River and flooded the Willamette Valley as far south as Eugene. The floodwaters carried rich volcanic and glacial soil from Eastern Washington, which was deposited across the valley floor when the waters subsided. The soil in the Willamette Valley is about 0.5 miles (1 km) deep in some areas.

The major agricultural products of the valley include many varieties of berries and vegetables. The valley also produces most of the grass seed, Christmas trees, and hazelnuts sold in North America. It is also noted for its hops, which are widely used in craft beer and microbreweries throughout the U.S. But it is greenhouse and nursery stock that have become the biggest agricultural commodity in the valley.

Grass farmers have been burning fields, as part of their production, since the 1940s. The smoke is often irritating to residents; in 1988 it caused a 23-car pileup on I-5. Over the years, several pieces of legislation have limited the amount of burning permitted. With the passage of a bill championed by legislator Paul Holvey in the 2009 session, burning has been banned since the summer of 2010, with the exception of an area of about 15,000 acres (60 km2) with steep terrain and certain species. (At its peak in the 1980s, about 250,000 acres (100,000 ha) were burned each year.)

In recent decades, the valley has also become a major wine producer, with multiple American Viticultural Areas of its own. With a cooler climate than California, the gently rolling hills surrounding the Willamette are home to some of the best (and most expensive) pinot noir in the world, as well as a high-quality pinot gris. It is home to Eyrie Vineyards, winner of the Pinot Noir competition at the Wine Olympics held in Paris in 1979.

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