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| Mamalahoa Highway | |
|---|---|
| Name | Mamalahoa Highway |
| Other names | Hawaii Route 190, Hawaii Route 11 (sections) |
| Length mi | 102 |
| Location | Hawaiʻi Island, Hawaii |
| Terminus a | Kohala (north) |
| Terminus b | Ka Lae (south) |
| Maint | Hawaii Department of Transportation |
Mamalahoa Highway is a principal arterial roadway traversing the leeward and southern slopes of Hawaiʻi Island, connecting Kohala to Ka Lae via Waimea and Nā‘ālehu. The route serves as a corridor between rural communities, Hilo-side access points, and coastal destinations, interfacing with regional hubs such as Honokaa, Kailua-Kona, and Hawaii Volcanoes National Park. It functions as both a local connector and a segment of the island’s primary intercity network utilized for commercial traffic, tourism, and emergency routing.
The highway begins near Kapaau in northern Kohala and proceeds southward past Hapuna Beach State Recreation Area, skirting agricultural zones around Kamuela before descending toward Waimea (Kamuela), where it intersects routes leading to Hawaii Preparatory Academy and Parker Ranch. Continuing southwest, the road threads through historic paniolo country, passing landmarks linked to Samuel Wilder King-era infrastructure and the Hawaiʻi Belt Road corridor. Further along, the highway connects Holualoa, Kealakekua Bay, and the Kona coffee belt, offering turnoffs to Kaloko-Honokōhau National Historical Park and Puʻuhonua o Hōnaunau National Historical Park. South of Naalehu it traverses semi-arid lava fields and approach roads for Hawaii Volcanoes National Park before terminating near Ka Lae and intersections providing access to coastal points such as South Point and fishing sites associated with Nā Pali-Kona fisheries. Along the route, the corridor crosses drainage systems tied to Hawaiian Islands aquifers and skirts conservation areas linked to Hawaiian Islands Humpback Whale National Marine Sanctuary outreach.
Construction and alignment reflect 19th- and 20th-century shifts in island transport influenced by figures like King Kamehameha III and plantation-era investors, with early pathways tracing traditional Heiau pilgrim trails and cattle-driving routes associated with John Palmer Parker and Kekauluohi. Road improvement campaigns during the territorial period involved coordination with Territory of Hawaii authorities and contractors connected to projects like the Hawaiian Homes Commission Act implementations. Mid-century upgrades coincided with increased tourism promoted by Matson Navigation Company and aviation links via Hilo International Airport and Kona International Airport at Keahole, prompting pavement and bridge work funded through territorial and state transportation initiatives. The highway’s role as an evacuation and supply artery became prominent during emergency responses for eruptions at Mauna Loa and Mauna Kea weather-related closures, leading to designation in contingency planning with Federal Emergency Management Agency protocols and Hawaii Emergency Management Agency coordination.
Intersections include junctions with primary and secondary arteries serving island destinations and institutions: the tie-in near Kawaihae Harbor access roads; connections to Queen Kaʻahumanu Highway spurs feeding Kailua-Kona commercial zones; junctions near Kealakehe linking to industrial parks; turnoffs toward Hilo via Saddle Road corridors; links providing access to Hawaiʻi Community College campuses and to county-maintained roads serving Pāhala and Nā‘ālehu. Other notable nodes interface with routes serving Kalapana, Puna communities, and trailheads leading to sites listed in the National Register of Historic Places on Hawaiʻi Island.
Traffic composition combines passenger vehicles, tour buses operated by companies connected to Hawaii Tourism Authority promotions, agricultural trucks hauling coffee and macadamia products bound for Honolulu shipping centers, and interisland freight transits linked to Daniel K. Inouye International Airport logistics. Peak seasonal loads correspond with events at Hawaii County venues, surf seasons at Hapuna Beach, and festivals such as Merrie Monarch Festival satellite activities. Public transit services by TheBus (Hawaii County) and private shuttle operators provide limited scheduled coverage, while ride-hailing and taxi services connect to ferry and air nodes at Kona International Airport. The highway also accommodates bicycle and pedestrian use near urbanized segments adjoining Waimea and Honokaa civic centers.
The corridor runs through landscapes integral to Native Hawaiian cultural practices associated with ʻāina stewardship, wahi pana (storied places) and sites tied to historical figures like Keōua Kūʻahuʻula and ʻohana (lineage) associations recorded in chants preserved by institutions such as Bishop Museum. Flora and fauna along the route include native koa and ʻōhiʻa forest remnants managed in partnership with Hawaii Department of Land and Natural Resources programs and community groups from Hawaiʻi County. Environmental considerations involve impacts on coastal fisheries linked to Papahānaumokuākea outreach, sedimentation affecting reef systems near Kealakekua Bay, and invasive species control coordinated with U.S. Fish and Wildlife Service initiatives. Cultural tourism sites accessible from the highway include petroglyph fields, historic ranch structures tied to Parker Ranch heritage, and archaeological complexes overseen by State Historic Preservation Division (Hawaii).
Maintenance responsibility rests with Hawaii Department of Transportation with periodic capital improvements funded through state transportation budgets and federal grants administered via entities such as U.S. Department of Transportation and Federal Highway Administration. Projects have included resurfacing, bridge retrofits meeting American Association of State Highway and Transportation Officials standards, modernization of signage compatible with Manual on Uniform Traffic Control Devices guidelines, and roadway realignment to mitigate erosion near lava flows influenced by Hawaiian Volcano Observatory monitoring. Community-driven enhancement efforts involve partnerships with Hawaiʻi Community Development Authority-linked programs, resilience planning with University of Hawaiʻi at Mānoa research groups, and grant-supported ecological mitigation coordinated with Conservation International and local non-profits.
Category:Roads in Hawaii Category:Transportation in Hawaii County, Hawaii