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| Saddle Road (Hawaii Route 200) | |
|---|---|
| Name | Saddle Road (Hawaii Route 200) |
| Length mi | 41.8 |
| Location | Hawaii Island, Hawaii |
| Direction a | West |
| Direction b | East |
| Terminus a | Mauna Kea Access Road near Hilo |
| Terminus b | Kona Coast Highway (Route 11) near Kealakekua |
| Maint | Hawaii Department of Transportation |
Saddle Road (Hawaii Route 200) is a principal east–west highway traversing the saddle between Mauna Kea and Mauna Loa on the island of Hawaii (island), connecting regions near Hilo and Kailua-Kona. The route links communities, astronomical facilities, and military sites, and has been central to regional transportation, land management, and cultural discourse. Its high-elevation alignment crosses volcanic rift zones, forest reserves, and protected areas, influencing travel between Hawaii Volcanoes National Park and Kona resorts.
The highway begins near the Onizuka Center for International Astronomy and Mauna Kea Access Road east of Hilo, proceeds westward across highland terrain between Mauna Kea and Mauna Loa, passes near the Humuʻula Saddle and Puʻu Kahaualeʻa, and descends toward Kona International Airport at Keāhole and Kailua-Kona. Along the corridor the route intersects Daniel K. Inouye Highway sections, abuts Hawai‘i Volcanoes National Park boundaries, and provides access to the Pacific Missile Range Facility-related roads and Hickam Air Force Base-linked logistics corridors. Travelers encounter junctions to legacy alignments, unpaved forest roads into Hawaiian Home Lands areas, and spurs toward observatory clusters near Keck Observatory-associated infrastructure.
Originally a rudimentary cattle and trail route used by paniolo linked to Kamehameha I-era land divisions and later by Territory of Hawaii-era planners, the corridor gained formal roadway status during World War II for strategic movement between Honolulu-area commands and Pearl Harbor logistics networks. Postwar development saw involvement by the Hawaii Statehood Commission and the Territorial Highway Program; federal funding streams through agencies such as the Federal Highway Administration influenced paving projects. The road’s historic alignments and military use drew attention from activists associated with Office of Hawaiian Affairs and cultural practitioners asserting stewardship over ʻāina connected to Native Hawaiian genealogy.
Major reconstruction beginning in the late 1990s and continuing through the 2010s involved the Hawaii Department of Transportation coordinating with contractors including firms experienced with Federal Highway Administration-funded projects and environmental compliance under statutes enforced by the United States Fish and Wildlife Service and National Park Service. Upgrades included full paving, realignment to reduce grades and curves, installation of modern drainage per National Environmental Policy Act processes, safety barriers matched to American Association of State Highway and Transportation Officials guidelines, and surfacing to accommodate heavy commercial traffic servicing Mauna Kea Observatories and defense installations like Pōhakuloa Training Area. Funding packages combined state bonds overseen by the Hawaii State Legislature with federal grants tied to Department of Defense access requirements.
Key junctions include the eastern terminus near the Mauna Kea Access Road and connections to routes leading to Hilo International Airport, mid-route spurs to the Pōhakuloa Training Area and Bradshaw Field Training Area access roads, intersections providing links toward Hawaii Volcanoes National Park visitor routes, and the western terminus interfacing with Queen Kaʻahumanu Highway and Mamalahoa Highway corridors serving Kona International Airport at Keāhole and Kailua-Kona commercial centers. The corridor’s intersections integrate with state-maintained collector roads, legacy county roads, and access points for Hawaiian Electric Industries infrastructure.
Traffic patterns reflect commuter flows between Hilo and Kona, commercial freight movements servicing observatories and military ranges, and seasonal tourist peaks driven by visitors to Mauna Kea and Hawaii Volcanoes National Park. Safety improvements addressed high-elevation hazards such as fog, snow, and volcanic vog associated with Kīlauea activity, with measures informed by studies from University of Hawaii at Mānoa researchers and state transportation planners. Crash reduction strategies implemented lane widening, shoulder paving, guardrails conforming to Federal Highway Administration standards, and signage coordinating with National Weather Service advisories.
The route traverses ecologically sensitive zones including native ʻōhiʻa forests within Hakalau Forest National Wildlife Refuge-proximate areas and habitats for species listed under the Endangered Species Act; mitigation required coordination with the United States Fish and Wildlife Service, State Historic Preservation Division, and stakeholders such as the Office of Hawaiian Affairs. Cultural impact assessments involved kūpuna and practitioners linked to wahi pana around Mauna Kea and Mauna Loa, invoking protections under state statutes administered by the Department of Land and Natural Resources and oversight by the Board of Land and Natural Resources. Conservation measures included invasive species controls aligned with United States Department of Agriculture programs and buffer zones adjacent to archaeological sites documented by specialists from Bishop Museum.
Proposed initiatives range from additional safety enhancements vetted by the Hawaii Department of Transportation and the Federal Highway Administration to access management schemes debated in hearings of the Hawaii State Legislature and local county councils. Long-term concepts include resilient surfacing standards responsive to climate impacts studied by the Pacific Islands Climate Adaptation Science Center, expanded multimodal connections linking to Hilo International Airport and Kona International Airport at Keāhole, and coordinated stewardship frameworks involving University of Hawaii System research programs, the Office of Hawaiian Affairs, and federal partners such as the National Park Service to reconcile transportation needs with cultural and ecological conservation.
Category:Roads in Hawaii Category:Hawaii (island) transportation