Hawaii Belt Road

Hawaii Belt Road The Hawaii Belt Road is a continuous circumferential highway system encircling the island of Hawaii (commonly called the Big Island), composed of several numbered routes that link coastal communities, military installations, agricultural districts, and volcanic landscapes. The corridor connects Hilo, Kailua-Kona, Waimea (Kamuela), Pāhoa, Keaau, Captain Cook and other settlements while traversing terrain associated with Mauna Loa, Mauna Kea, Kīlauea, and Hualālai. The roadway plays a central role in regional transportation, tourism, emergency evacuation planning, and intercounty logistics tied to Honolulu policy and statewide infrastructure funding.

Route description

The route comprises segments of Hawaii Route 11, Hawaii Route 19, and Hawaii Route 190, plus the Saddle Road section of Hawaii Route 200, forming a near-continuous loop around the island. From Hilo the corridor follows Hawaii Route 11 southwest past Hawai‘i Volcanoes National Park, skirting Kīlauea Caldera and passing near Pūʻālaʻa State Wayside Park toward Pāhala and Nā‘ālehu. Westbound, the highway continues along lava-plain communities toward Ka Lae then turns north along Hawaii Route 11 and Hawaii Route 190 by Olaa and agricultural lands near Kona International Airport at Keāhole before reaching Kailua-Kona. The North Kohala and Hamakua segments follow Hawaii Route 19 along cliffs and valleys facing the Pacific Ocean, connecting Hāmaʻula, Honokaa, and Waipiʻo Valley. The Saddle Road across the island’s interior links Hilo and Kamuela via a high-elevation route that bisects slopes of Mauna Kea and Mauna Loa.

History

Pre-contact trails across the island aligned with coastal settlements and mountain passes used by native residents associated with Kamehameha I and other aliʻi. During the 19th century, missionaries from American Board of Commissioners for Foreign Missions and officials of the Kingdom of Hawaii initiated road improvements to link ports such as Hilo Bay and Kealakekua Bay. The Territorial Government of Hawaii Island and later the Territory of Hawaii invested in macadamized roads during the early 20th century, with major federal works under programs like the Works Progress Administration expanding access to plantations owned by firms such as Alexander & Baldwin and C. Brewer & Co.. Military priorities during World War II led to fortification of coastal routes and development of interior connectors to Pōhakuloa Training Area and Keaau supply lines. Post-war statehood projects funded by the Hawaii State Legislature and Federal Highway Administration modernized surfacing, realigned hazardous coastal cliffs, and completed the Saddle Road upgrades in the 21st century after collaborations with the United States Department of Defense and the State of Hawaii Department of Transportation.

Major intersections and segments

Key junctions include the intersection of Hawaii Route 11 and Hawaii Route 19 near Hilo International Airport, the Kealakekua turnoffs serving Kaloko-Honokōhau National Historical Park and Puʻuhonua o Hōnaunau National Historical Park, and the Saddle Road intersections with roads leading to Mauna Kea Observatories and Daniel K. Inouye Highway access. Significant segments: - Hilo to Volcano: links Hilo International Airport, Hawaii Volcanoes National Park, and communities such as Keaau. - South Kona/Kona Coast: serves Kona International Airport at Keāhole, Kealakekua Bay, and Old Kona Airport State Recreation Area. - North Kohala and Hamakua Coast: includes steep cliffside stretches near Pololū Valley and Waipiʻo Valley that intersect county roads to Hawi, Hawaii and Honokaʻa. - Saddle Road (Route 200): provides the most direct high-elevation crossing between Hilo and Waimea with junctions for Pōhakuloa Training Area and access roads toward Haleakalā planners and astronomical facilities.

Traffic, maintenance, and safety

Traffic volumes vary widely: urbanized corridors near Hilo and Kailua-Kona experience commuter and tourist congestion, while rural stretches have low Average Annual Daily Traffic counts but higher risk per vehicle-mile. Seasonal tourism peaks driven by events at Hawaii Volcanoes National Park, Ironman World Championship in Kailua-Kona, and cultural festivals at Merrie Monarch Festival affect capacity. Maintenance is administered by the State of Hawaii Department of Transportation with periodic resurfacing, bridge rehabilitation funds from the Federal Highway Administration, and emergency repairs following eruptions from Kīlauea or storms tracked by National Weather Service Honolulu. Safety campaigns have coordinated with Hawaii County Police Department and Hawaii County Fire Department for avalanche-like lava flows, landslides near Hāmākua Coast, and highway fatality reduction initiatives modeled on standards from the National Highway Traffic Safety Administration.

Cultural and environmental impact

The roadway traverses lands of significance to Native Hawaiian cultural practitioners, including access to wahi pana and ʻawa sites near Puʻuhonua o Hōnaunau and fishpond systems associated with Kamehameha III. Its alignment affected traditional ahupuaʻa boundaries and agricultural taro cultivation in valleys like Waipiʻo Valley and Hāmākua; mitigation involved consultations with Office of Hawaiian Affairs and cultural surveys by the Hawaii State Historic Preservation Division. Environmental management has addressed impacts on endemic species such as the Hawaiian monk seal, ʻiʻiwi, and native plant communities on wet cliffs and lava fields, with projects coordinated with United States Fish and Wildlife Service, The Nature Conservancy, and Hawaiian Volcano Observatory. Tourism enabled by the loop supports museums like the Lyman Museum, visitor centers at Kaloko-Honokōhau, and gateway economies in Pāhoa and Kailua-Kona, while raising concerns over coastal erosion, runoff into reefs protected under Papahānaumokuākea Marine National Monument policy discussions and community-led stewardship through organizations such as Hoʻokupu Aloha.

Category:Roads in Hawaii