California Highways:
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Jolon Road from Interlake Road (County Sign Route G14) to US 101 near Bradley (FAS, 16.40 mi)

The corridor of Monterey County Sign Route G18 and Jolon Road is tied to that of the Spanish iteration of El Camino Real and Mission San Antonio de Pauda.  The Santa Lucia Mountains and general course of the San Antonio River were explored by the Spanish during 1769 Portola Expedition of Las Californias.  Mission San Antonio de Pauda was founded during 1771 near the San Antonio River.  The San Antonio River proved to be a reliable source of water for irrigation purposes between Mission San Miguel Arcangel and Mission Nuestra Senora de la Soledad.  Thusly general path of the Spanish iteration of El Camino Real followed the general corridor of modern Jolon Road from Mission San Miguel Arcangel through the Santa Lucia Mountains towards Mission Nuestra Senora de la Soledad.  During the 1870s and 1880s, the Southern Pacific Railroad constructed a line through Salinas Valley towards San Miguel.  The Southern Pacific Railroad would develop frontage roads which would replace the corridor of Jolon Road as the primary through highway between San Miguel and Mission Soledad.  These frontages during the 20th Century would form the basis of LRN 2/US 101.
(Source: Gribblenation Blog (Tom Fearer), "Monterey County Route G18", 10/1/2023)

By 1935, Jolon Road was a major local highway. Jolon Road originated at US 101 near Bradly and looped back to it near King City.  Jolon Road east of Lockwood followed what is now Bradley-Lockwood Road  Jolon Road became prominent during World War II due to the formation of Fort Hunter Liggett during 1940 near Jolon.  Forty miles of improvements of Jolon Road began as a Work Projects Administration (WPA) project during early 1941 and would conclude during late year 1942.  The segment of Jolon Road between Bradly to Lockwood was straightened as part of the corridor improvements. 
(Source: Gribblenation Blog (Tom Fearer), "Monterey County Route G18", 10/1/2023)

During 1971 Jolon Road was assigned as Monterey County Sign Route G14 and Monterey County Sign Route G18.  Monterey County Sign Route G18 was assigned to the 16.40 miles of Jolon Road east of Lockwood.  Monterey County Sign Route G14 was assigned to the 23.82 miles northwest of Lockwood.  At some point between the mid-1970s and early 1980s, the Jolon Grade on Monterey County Sign Route G14 north of Jolon was straightened.
(Source: Gribblenation Blog (Tom Fearer), "Monterey County Route G18", 10/1/2023)

This route was defined in 1971.

• Gribblenation Blog (Tom Fearer): Monterey County Route G18

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