Such explosive growth has caught the attention of Utah Republican Sen. Bob Bennett and Democratic Rep. Jim Matheson, who last week unveiled The Washington County Growth & Conservation Act of 2006. It would create a comprehensive plan for managing public lands in Washington County and preserve more than 219,000 acres in and near Zion National Park as wilderness.

Highlights of the proposal include selling around 25,000 acres of public land and using 15 percent of the proceeds for public education, water projects and fire and flood protection. The other 85 percent would be earmarked to preserve historic rangeland and vital watersheds, buy more land to protect endangered species and improve conservation efforts on numerous projects throughout the county.

All of which is designed to help manage growth for both longtime residents and newcomers, many of whom are no strangers to the Beehive State.

Perhaps surprisingly, roughly 51 percent of Washington County buyers in 2005 were from Utah, snowbirds seeking an escape from the long winter of the state's northern half, according to Southern Utah Title Co. Next were Californians, who made up 26 percent of all transactions. Nevada came in third at 10 percent, with other states making up 13 percent.

They are people like Rocky Burt, 55, a former program analyst for the state of Alaska, who retired to Washington County three years ago after vacationing at Zion National Park.

In March, Burt and his wife moved into a new 3,700-square-foot home in Washington city. He said the $1.2 million home, complete with 22-foot-high ceilings, automated blinds, a courtyard, outdoor kitchen and two waterfalls, is a bargain compared to similar properties in Pismo Beach, Calif., where they originally looked to retire.

"We found the values here — especially for the quality of construction and what you get for your money here — to be far superior as to what you can get in California," Burt said. "We think we made the best choice."

About 80 percent of Washington County's growth comes from such in-migration, Wood said. In 2005, net in-migration for the county totaled 8,300 people. Only Salt Lake and Utah counties had more.

Mike Thomas, 58, of Budd Lake, N.J., purchased a building lot two years ago for $112,000 in Foremaster Ridge, which sits on East Bluff above the Dixie Regional Medical Center in St. George.

Today, that same lot would sell for about $230,000, according to Doug Rogers, co-developer of the subdivision. Lots in the subdivision's newest phase are now selling for $340,000, with homes in the neighborhood valued as high as $2 million.