Hawaii island residents and officials are preparing for the potential cutoff of the main traffic artery should Mauna Loa spew lava across Saddle Road as expected in the next week.

Big Island locator map

Officially dubbed Daniel K. Inouye Highway, Saddle Road connects the windward and leeward sides of the island. Originally built by the Army during World War II to access military land at the saddle of Mauna Loa and Mauna Kea volcanos, Saddle Road is the shortest and most direct route between the island’s major population centers on opposite coasts.

Since Mauna Loa began erupting a week ago, volcano watchers have closely monitored the lava鈥檚 trajectory as it oozes downslope toward the critical state roadway. As of Sunday morning, just over two miles separated the road and lava, and the flow is advancing at about 40 feet an hour, according to Hawaii County Civil Defense.

If estimates hold, molten rock is expected to slather some portion of the road in about a week. But as is the nature of volcanos, things could change dramatically, and Saddle Road could be spared. If not, many routines will be disrupted.

The early evening view of the lava flow from Mauna Loa, roughly 3.5 miles away from Saddle Road on Thursday. David Croxford/Civil Beat/2022

Thousands of people traverse Saddle Road daily, including tourism and resort employees who live on the Hilo side and work at jobs on the Kona side. Other regulars include tradespeople, hospital workers, landscapers and truck drivers hauling food, fuel, waste and myriad forms of cargo.

Mattson Davis, owner of Magics Beach Grill in Kona, said he鈥檚 already heard from vendors who鈥檝e told him to prepare for longer wait times for grocery deliveries because they鈥檙e anticipating having to take the Hawaii Belt Road to the north.

鈥淚鈥檓 personally concerned about how it鈥檚 going to affect my pocketbook,鈥 Davis said. 鈥淲ill I get my supplies?鈥

The Belt Road hugs the Hamakua Coast from Hilo north to Honokaa and then juts west toward Waimea and down toward Kona. Workers commute from all over the island for shifts at resorts like Mauna Kea Beach, Mauna Lani, Westin Hapuna Beach, Waikoloa Beach, Four Seasons Resort Hualalai and others.

A map shows the difference in driving times between Hilo and Kona on Saddle Road and the Hawaii Belt Road. April Estrellon/Civil Beat/2022

Saddle Road drivers can get from Hilo to Waikoloa in about an hour. It’s a smooth, paved road Davis described as “Hawaii’s Autobahn.”

If motorists have to take the Belt Road it could lengthen commutes because the Belt Road meanders through small communities with slower speed limits, traffic lights and crosswalks.

Kevin Hayashi is a golf professional who lives in Hilo and runs the Waikoloa Village Golf Club. He commutes five days a week on Saddle Road.

Kevin Hayashi, a golf pro, lives in Hilo and commutes to Waikoloa Village Golf Club five days a week on Saddle Road. David Croxford/Civil Beat/2022

鈥淭hat road is such a blessing,鈥 Hayashi said. “It鈥檚 the best road on the island.”

Hayashi鈥檚 trying to stay positive and accept the fact that he might have to start driving the long way around. One thing he鈥檒l miss if Saddle Road gets blocked is the highway鈥檚 wide shoulders and long, straightaways which add an element of safety.

The Belt Road is narrow and windy.

鈥淚f somebody starts veering off, there鈥檚 no place to go a lot of times,鈥 he said.

On Thursday evening, Volcano resident J. Malia Buck had set up her tripod at dusk along Saddle Road and was settling in for an evening of lava gazing.

A semi-retired journalist originally from Maui, Buck routinely drives from Volcano to Kona via Saddle Road to shop at Costco, among other things. The prospect of having to take the longer route over the Belt Road has her rethinking her shopping patterns.

鈥淚鈥檓 not going to spend six hours driving in the car for one hour at Costco,鈥 Buck said.

Mattson Davis, owner of Magics Beach Grill in Kona, said he鈥檚 already heard from vendors who鈥檝e told him to prepare for longer wait times for grocery deliveries. David Croxford/Civil Beat/2022

Sean O鈥橮helan, a resident of Hawaiian Paradise Park south of Hilo, had stationed himself at a prime viewing area Thursday along Saddle Road across from the Mauna Kea Access Road.

If lava eventually covers Saddle Road, 鈥渋t impacts the whole island,鈥 he said.

Besides making it harder to reach Costco, west side beaches, and other amenities, O鈥橮helan worries about how working families would handle having to drive long distances to get to jobs. With soaring inflation, gas prices averaging $5.30 per gallon, and a staggering cost of living already, anything that adds more strain to a family budget is of concern.

鈥淚 worry about our community on both sides of the island,鈥 he said.

The county鈥檚 mass transit administrator said he鈥檚 already made contingencies to shift the Hilo-Kona bus route that goes across Saddle Road to the Belt Road. It鈥檒l be an express bus and should only add about 25 minutes to the route, said John Andoh.

A view of Saddle Road looking back toward Mauna Kea, Thursday. David Croxford/Civil Beat/2022

How a major transportation bottleneck, like having the Saddle Road cut off, would play out for the island鈥檚 workforce remains to be seen. In what is already a tight labor market, some employers wonder whether extended commute times combined with high gas prices might make it even harder to find and retain good employees.

Craig Anderson, vice president of operations for Mauna Kea Resort, said he had felt a 鈥渓ittle anxiety mixed with joy and glee鈥 when he first saw the glow of Mauna Loa鈥檚 eruption from his home near Waimea.

Mauna Kea Resort employs about 1,200 workers and about 5% of those commute over from the Hilo side.

Despite the unknowns, Anderson is optimistic that even if Saddle Road gets shut down, it won鈥檛 be a huge blow for the resort industry.

鈥淲e think it鈥檚 an inconvenience but we鈥檙e not anticipating any major fallout,鈥 Anderson said.

One upside of the volcanic eruption is a boost in inquiries and bookings the resort is experiencing from people wanting to come to the Big Island to see the lava up close, he said.

鈥淔or every call that we get from people concerned about their safety or air quality or flights or being run over by molten lava, for every one of those, there are probably 40 or 50 calls about, 鈥榃hat鈥檚 it look like?鈥 鈥楾his is exciting!鈥 Overwhelmingly, the interest is in wanting to experience it.鈥

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