Dal Hawks likens the traffic in Washington County to a flood. It started as a trickle, but with each new person and each new development, the river of cars is quickly expanding.

And soon, it could become a torrent.

"If you create a rainstorm in one area, it's just going to flow down and get into someone else's property," said Hawks, director of the Utah Department of Transportation's Region 4, which covers the southern half of the state.

By 2035, long-range planners predict that traffic volumes in parts of Washington County will more than double. St. George Boulevard is looking at an additional 9,400 cars each day. Bluff Street is facing a 33,400-car increase in traffic.

The Snow Canyon Parkway? An increase of more than 85,000 vehicles, according to the Dixie Metropolitan Planning Organization, or MPO. The group was created in 2002, and like its Wasatch Front counterparts, it is charged with long-range planning for the St. George urban area.

Lowell Elmer, director of the Dixie MPO, said more than a dozen transportation projects are planned for the St. George area by 2030. Environmental studies are being done for a belt route between Hurricane and St. George that will connect to I-15 and the planned location of a new regional airport.

Waiting for the St. George Airport to move from its current location atop a mesa in the middle of town to another location where larger jets can land has been frustrating, said Mayor Dan McArthur.

"We've been working on this since 1994," McArthur said. "It's taking much longer than it ought to. The airport is going to cost $20 million more than what we originally expected."

St. George officials must wait for a final environmental impact statement, which the Federal Aviation Administration says could be released by the end of May, and a final Record of Decision expected in September, the mayor said. Once those are received, the design phase of the $100 million replacement airport can begin.

Although public transportation is a rather new option in St. George, its use is growing and routes are expanding. SunTran buses carry riders on three routes to 60 stops, with covered bus shelters provided and a central transit center under construction. SunTran doesn't yet provide Sunday service, but that could change if ridership numbers increase.

A western belt route dipping down toward SunRiver to the south of St. George and a corridor north of the city also are planned. McArthur is anxious to get cars off some of the traditional roadways and says the northern corridor is a "critical" transportation project.