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| U.S. Route 198 | |
|---|---|
| State | CA |
| Type | US |
| Route | 198 |
| Length mi | 76.00 |
| Established | 1926 |
| Direction a | West |
| Terminus a | near Arroyo Grande |
| Direction b | East |
| Terminus b | near Sequoia National Park |
| Counties | San Luis Obispo, Tulare |
U.S. Route 198
U.S. Route 198 is an east–west United States Numbered Highway running through central California from the Pacific coast near Arroyo Grande to the western approaches of Sequoia National Park near Three Rivers. The route connects coastal communities, agricultural valleys, and mountainous terrain, providing links between Interstate 5, U.S. Route 101, California State Route 41, and various national parks and national forests adjacent to the Sierra Nevada. It serves regional traffic for San Luis Obispo County, Tulare County, and facilitates access to visitor destinations such as Sequoia National Park, Kings Canyon National Park, and the Los Padres National Forest.
U.S. Route 198 begins near Arroyo Grande at an interchange with U.S. Route 101 and proceeds eastward through Grover Beach, Pismo Beach, and the agricultural plain of San Luis Obispo County before climbing toward the Coast Range and crossing into the San Joaquin Valley. The corridor intersects with California State Route 41 near Atwell, providing a connection toward Fresno and the southern entrances to Yosemite National Park and Sequoia National Park. Continuing east, the highway traverses the city of Visalia with connections to California State Route 99 and Interstate 5 via regional routes, then ascends the western slopes of the Sierra Nevada through the Kaweah River canyon, passing near Three Rivers and terminating at the boundary of Sequoia National Park.
Along its alignment, the highway interfaces with numerous transportation and civic nodes including the Port of Hueneme corridor, the Southern Pacific Transportation Company historic rights-of-way, and municipal infrastructures in Paso Robles, Atascadero, and Hanford. The route crosses waterways such as the Kings River, Kaweah River, and tributaries feeding the San Joaquin River, and provides access to cultural sites like the Visalia Convention Center, Tulare County Museum, and recreational areas managed by the National Park Service and the United States Forest Service.
The corridor that became U.S. Route 198 follows early wagon roads and state highways developed during the late 19th and early 20th centuries to link coastal ports and inland agricultural markets. Early improvements were influenced by freight movements tied to the Southern Pacific Railroad and by regional leaders in San Luis Obispo and Tulare County who sought reliable links to Los Angeles and the Central Valley. Routed as part of the original 1926 United States Numbered Highway system, the highway saw pavement campaigns during the Great Depression under state highway programs and later expansions during the post-World War II era to accommodate tourism to Sequoia National Park and increasing truck traffic serving Central Valley agriculture.
Major modifications occurred with the advent of the interstate era, when connections at U.S. Route 101 and corridors serving Interstate 5 were reconfigured to improve safety and freight flow. Environmental reviews involving the National Park Service and the California Department of Transportation addressed concerns about runoff, erosion, and impacts to giant sequoia groves. Over the decades, upgrades have included realignments to reduce curvature in mountain segments, bridge replacements over the Kings River and Kaweah River, and urban bypasses to relieve congestion in Visalia and nearby towns influenced by population growth trends tracked by the United States Census Bureau.
Key intersections and interchanges along U.S. Route 198 include the junction with U.S. Route 101 near Arroyo Grande; connections with California State Route 41 toward Fresno and Yosemite National Park; crossings of California State Route 99 and proximity to California State Route 63 within the Visalia area; and tertiary links to county routes providing access to Porterville and Hanford. The highway’s terminus at the Sequoia National Park boundary interfaces with park roads managed by the National Park Service and links to trails and facilities associated with Giant Sequoia National Monument and Kings Canyon National Park. Freight and commuter flows at these intersections are monitored by regional agencies including the Tulare County Association of Governments and the San Luis Obispo Council of Governments.
Related numbered highways and corridors that interact with U.S. Route 198 include U.S. Route 101, California State Route 41, California State Route 99, and feeder county routes such as County Route J37 and County Route J22 that serve the Central Valley agricultural network. The route forms part of broader corridors connecting to Interstate 5, California State Route 46, and scenic byways leading to Morro Bay, Cayucos, and inland destinations like Paso Robles wine country. Its role in park access ties it to National Park Service routes serving Sequoia and Kings Canyon as well as forest roads within the Sequoia National Forest and the Los Padres National Forest.
Planned and proposed projects affecting U.S. Route 198 focus on safety improvements, shoulder widening, and bridge resilience for seismic and hydrologic events anticipated by state planners and agencies such as the California Department of Transportation and regional Metropolitan Planning Organizations like the Tulare County Association of Governments and the San Luis Obispo Council of Governments. Climate resilience initiatives reflect coordination with the United States Geological Survey and the National Oceanic and Atmospheric Administration for flood modeling in the Kaweah and Kings River watersheds. Potential funding sources include state transportation bonds and federal programs administered by the Federal Highway Administration, with stakeholder engagement involving the National Park Service, United States Forest Service, county boards of supervisors, and community organizations in Visalia, Arroyo Grande, and Three Rivers.