Photos by Ed Reinke / AP Jimmy Russell, master distiller for Wild Turkey, where he's worked since 1954, discusses making bourbon while in a warehouse in Lawrenceburg, Ky.

LAWRENCEBURG, Ky. — To Wild Turkey master distiller Jimmy Russell, the piercing sounds of a warehouse rising in the Kentucky countryside are the sounds of prosperity. "As long as you see work going on — and the construction, and increasing your size — you know your business is doing well," said Russell, who started working for the bourbon maker in 1954.

Distillers are expanding their bourbon production and storage, and dispatching sales teams around the world, bullish for a traditionally Southern beverage gaining popularity worldwide. Surging exports, the weak U.S. dollar and rising popularity among younger Americans are driving the boom.

"It's an exciting time to be in the bourbon business," said Max L. Shapira, president of Heaven Hill Distilleries Inc., a family-owned company based in Bardstown. "Most of the time that I've been in the business, up until about the last 10 years, everybody was trying to consign the bourbon category to that great liquor store in the sky."

Heaven Hill recently spent nearly $4 million boosting capacity at its Louisville distillery, where it makes Evan Williams and Elijah Craig bourbons.

Wild Turkey, part of beverage company Pernod Ricard SA, based in France, sold more than 1 million cases worldwide last year for the first time. Its $36 million expansion near Lawrenceburg will nearly double its production. The distillery at Jack Daniels Tennessee Whiskey in Lynchburg, Tenn., is about to undergo a nearly $6 million addition.

Maker's Mark is preparing for a second expansion. And Jim Beam, the world's biggest bourbon maker, is in the midst of a $70 million expansion in Kentucky. Beam and Maker's are part of Fortune Brands Inc.

International expansion in this quintessentially American segment is more than offsetting the pinch of rising grains and fuel costs. Grain accounts for a fraction of the overall cost of making bourbon, even though it's made from a mix that must be at least 51 percent corn.

Eric Schmidt, research director at Beverage Information Group, said much of the sales growth has been in higher-priced small-batch and single-barrel products.

"Younger consumers are interested in drinks that were, you might say, their grandfathers' drinks," Shapira said.

According to Beverage Information Group, a market research firm tracking the liquor industry, 14.7 million 9-liter cases of straight whiskey sold in the U.S. last year. Up about 1 percent from 2006, the figure still lags behind vodka and rum in sales and percentage growth, but is outpacing Scotch whisky, the firm said.