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U.S. Geological Survey, Tim Orr, Associated Press
This Monday, Sept. 8, 2014, aerial photo provided by the U.S. Geological Survey shows a smoke plume from the June 27th flow from the Kilauea volcano in Pahoa, Hawaii. Lava from one of the world's most active volcanos has been advancing at a slower pace the past few days and is now moving parallel to a sparsely populated subdivision on Hawaii's Big Island.

HONOLULU — Lava from one of the world's most active volcanos soon could reach three vacant lots in a rural subdivision on Hawaii's Big Island, but officials are hopeful homes will be spared.

Based on the lava's movement of about 200 to 300 yards per day, the flow from Kilauea volcano could reach the lots in Kaohe Homesteads sometime Friday, Hawaii County spokesman Kevin Dayton said. The large lot closest to the flow is owned by the state, while the other two are privately owned, he said.

"The fact that it's veering somewhat to the north as opposed to the east is a hopeful sign," Dayton said. While no evacuations have been ordered, residents are asked to remain on alert and be prepared for possible changes in the lava's course.

The slow-moving molten rock could spread and slow even further in coming days as it moves from a steeper grade to more level land, Dayton said.

The lava Friday morning was about 3 miles from Pahoa Village Road and 3.5 miles from Highway 130, Dayton said. Highway 130 is a lifeline for the mostly rural Puna district, which would be cut off from the rest of the island if lava crosses the busy two-lane highway.

In preparation for that possibility, work was to continue into the weekend and next week to turn little-used, defunct roads into alternate routes.

Lava could reach the highway within weeks.

State and county officials plan to survey one of the unpaved roads for any archaeological or cultural elements that need to be preserved, Dayton said.

The flow has snaked more than 10 miles through thick forest since it first was observed emerging from a vent in late June.

It has engulfed trees and other vegetation in its path, sending up large smoke plumes. However, rainfall in the area has prevented fires from spreading from the lava, the Hawaiian Volcano Observatory said in a Friday update.

Follow Jennifer Sinco Kelleher at http://www.twitter.com/JenHapa .