California "G" County Routes


A uniform numbering system has been adopted to uniquely identify county routes across the state of California. Within this system, each route designation has a letter and number combination. The first digit is a letter, and the second and third digits are numbers. The lower letters are generally to the north of the state, and the higher numbers are generally located in the southern part of the state. The lowest route is Lassen County Route A-1, and the highest route is Imperial County Route S-80.

This page profiles the "G" series of county routes, located in Santa Clara, San Benito, Monterey, Santa Cruz, and San Luis Obispo Counties. Many of the surface expressway system in Santa Clara County is designated within the G-numbered county route network.

San Benito County Route G-1/Salinas Road and San Juan Canyon Road
Santa Clara County Route G-2/Lawrence Expressway north
Now in the city of Santa Clara, northbound Santa Clara County Route G-2/Lawrence Expressway approaches its junction with Interstate 280. The Lawrence Expressway is a major north-south county-signed arterial that originates at the intersection of Quito Road and Saratoga Avenue and travels north through Campbell, Santa Clara, and Sunnyvale, ending at California 237. Photo taken 02/20/12.
Northbound Santa Clara County Route G-2/Lawrence Expressway approaches its junction with Interstate 280. Stay right for the connection to Interstate 280 south (east) to San Jose and points north via Interstate 680. The second right connects to Stevens Creek Boulevard, which will in turn connect to Interstate 280 north. Photo taken 02/20/12.
Passing under Interstate 280 and after the turnoff to Interstate 280 south, the right lane becomes exit only from Santa Clara County Route G-2/Lawrence Expressway north to Stevens Creek Boulevard and Interstate 280 north. Photo taken 02/20/12.
Taking the ramp from northbound Santa Clara County Route G-2/Lawrence Expressway to Stevens Creek Boulevard, we immediately merge with traffic connecting from the Interstate 280 north offramp. Photo taken 02/20/12.
Now on the offramp from northbound Santa Clara County Route G-2/Lawrence Expressway to Stevens Creek Boulevard. Turn left for Stevens Creek Boulevard to Interstate 280 north, or turn right for Stevens Creek Boulevard to San Jose (parallel to Interstate 280). Photo taken 02/20/12.
A pair of Santa Clara County Route G-2 trailblazer route markers is posted on the offramp from Lawrence Expressway north to Stevens Creek Boulevard. These signs are posted for the benefit of traffic entering the area from Interstate 280 north. Turn left for Stevens Creek Boulevard to Interstate 280 north and to Santa Clara County Route G-2/Lawrence Expressway south, or continue straight ahead to rejoin G-2/Lawrence Expressway north to Sunnyvale. Photo taken 02/20/12.
Scenes Pertaining to Santa Clara County Route G-2
Westbound Stevens Creek Boulevard approaches the onramp to Interstate 280 north. After passing under the freeway, the next left turn will connect to Santa Clara County Route G-2/Lawrence Expressway. Photo taken 02/20/12.
Santa Clara County Route G-3/Oregon Expressway and Page Mill Expressway
Santa Clara County Route G-4/San Tomas Expressway and Montague Expressway
Santa Clara County Route G-5/Foothill Expressway
Santa Clara County Route G-6/Central Expressway, De La Cruz Boulevard, and Alma Street
Santa Clara County Route G-7/Bloomfield Road
Santa Clara County Route G-8/Almaden Expressway, McKean Road, Watsonville Road, and Alma Street
Santa Clara County Route G-9/Leavesley Road and Ferguson Road
Santa Clara County Route G-10/Blossom Hill Road
Monterey County Route G-11/San Juan Road west
This is the first reassurance shield along westbound Monterey County Route G-11 (San Juan Road) after the at-grade intersection with U.S. 101 and California 156 near Prunedale. From here, G-11 will travel northwest to Pajaro and Watsonville to meet California 129 and California 152. Photo taken 11/29/04.
Monterey County Route G-11/San Juan Road west
Eastbound Monterey County Route G-12 (San Miguel Canyon Road) approaches U.S. 101 and California 156 at this intersection. A gas station connects directly with U.S. 101 and the county route at this intersection. Photo taken 11/29/04.
This U.S. 101 trailblazer is posted at the eastern end of Monterey County Route G-12. There is no END shield present. Photo taken 11/29/04.

Monterey/Santa Cruz County Route G-12/San Miguel Canyon Road, Hall Road, Salinas Road, and Porter Road
Monterey/San Benito County Route G-13/Bitterwater Road and King City Road
San Luis Obispo/Monterey County Route G-14/Interlake Road, Nacimiento Lake Road, and Jolon Road
Monterey County Route G-15/Metz Road south
This series of pictures follows Monterey County Route G-15/Metz Road from California 146 in Soledad south to Kings City. G-15 follows the contour of the foothills as it parallels the adjacent railroad until it reaches its junction with G-13 in King City. G-15 and G-13 merge together briefly, then split in downtown King City, with G-15 and Business U.S. 101 continuing south on First Street to U.S. 101 and G-13 and Business U.S. 101 proceeding west on Broadway Street to U.S. 101 north. Photos taken 02/21/12.
Continuing along the foothills, Monterey County Route G-15/Metz Road approaches its junction with Monterey County Route G-16/Elm Avenue. G-16 travels west to Greenfield, Sycamore Flat, and Millers Ranch, then northwest to Carmel Valley and Carmel-by-the-Sea (ending at California 1/Cabrillo Highway). Photos taken 02/21/12.
Monterey County Route G-15/Metz Road proceeds south toward King City. The railroad maintains its grade by taking a tunnel through a hill, while the highway extends over the hill on a much more winding and curving route. Photos taken 02/21/12.
After nearly a dozen miles of winding, twisting roadway clinging to hillsides, Monterey County Route G-15/Metz Road finally sees straight, flat stretches. A power substation rises on the west side of the highway as King City comes into view in the distance ahead. Photos taken 02/21/12.
A power line parallels G-15; it brings power generated in King City north to the substation. Photos taken 02/21/12.
Monterey County Route G-15/Metz Road widens as it enters the industrial section of King City. Photo taken 02/21/12.
Southbound Monterey County Route G-15/Metz Road approaches Monterey County Route G-13/Bitterwater Road. At this intersection, turn right for G-13 west and G-15 south into downtown King City. Photo taken 02/21/12.
Monterey County Route G-15 and G-13/First Street south
Monterey County Route G-15 south and Monterey County Route G-13 west cross the railroad track and approach the intersection with Business U.S. 101/Broadway Street. Turn right here for Business U.S. 101 north and G-13 west along Broadway Street or continue straight ahead for Business U.S. 101 south and G-15 south toward the U.S. 101 interchange. Photo taken 02/21/12.
Monterey County Route G-15 and Business U.S. 101/First Street south
Monterey County Route G-15 and Business U.S. 101 proceed south through King City. The next major intersection is with Lonoak Road (left turn). Photo taken 02/21/12.
Southbound Monterey County Route G-15 and Business U.S. 101 approaches Lonoak Road (left turn). Photo taken 02/21/12.
Monterey County Route G-15 and Business U.S. 101 approach the interchange with U.S. 101, which travels north to Salinas and San Francisco and south to San Luis Obispo and Los Angeles. Photo taken 02/21/12.
At the interchange with U.S. 101, Monterey County Route G-15 and Business U.S. 101 reach their southern terminus. Turn right for U.S. 101 north or proceed across the bridge to U.S. 101 south. Photo taken 02/21/12.
A freeway entrance shield assembly is posted for U.S. 101 south shortly thereafter (left turn). Photo taken 02/21/12.
Monterey County Route G-16/Carmel Valley Road, Arroyo Seco Road, and Elm Avenue
Monterey County Route G-17/Reservation Road, River Road, Fort Romie Road, and Arroyo Seco Road
Monterey County Route G-18/Jolon Road east
Eastbound Monterey County Route G-18 (Jolon Road) ends at its junction with U.S. 101 near the northern end of Monterey County Route G-19 (Nacimiento Road). These photos show the U.S. 101 shields located at the eastern terminus. Photos taken 11/25/02.
Monterey County Route G-19/Nacimiento Lake Drive north
An END shield for northbound Monterey County Route G-19/Nacimiento Road is posted prior to the junction with Monterey County Route G-18/Jolon Road near the U.S. 101 interchange. Photos taken 11/25/02.
Turn left for Monterey County Route G-18/Jolon Road west to Lockwood, where it meets G-14/Interlake Road. Turn right for G-18 east to U.S. 101. Photos taken 11/25/02.
Monterey County Route G-20/Laureles Grade Road
Santa Clara County Route G-21/Capitol Expressway (Unsigned)

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Page Updated February 21, 2012.

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