Question: When was the route that U.S. Route 123 is a spur of originally made?
Context: State Route 123 (SR 123) is a state highway in the U.S. state of California in the San Francisco Bay Area.  Named San Pablo Avenue for virtually its entire length, SR 123 is a major north–south state highway along the flats of the urban East Bay in the U.S. state of California.  Route 123 runs a relatively short 7.39 miles (11.9 km) between Interstate 580 in the south and Interstate 80 in the north.  San Pablo Avenue itself, a portion of Historic US 40, continues well past these termini but without the Route 123 designation. West Virginia Route 123 is an east–west state highway located in the Bluefield, West Virginia area.  The western terminus of the route is at the Virginia state line northwest of Bluefield, where WV 123 continues west as secondary State Route 643.  The eastern terminus is at U.S. Route 19 and U.S. Route 460 northeast of Bluefield. U.S. Route 123 (US 123) is a spur of US 23 in the U.S. states of Georgia and South Carolina.  The U.S. Highway runs 75.12 mi from US 23, US 441, and SR 365 near Clarkesville, Georgia, north and east to Interstate 385 Business (I-385 Business) in Greenville, South Carolina.  US 123 parallels I-85 to the north as it connects the Northeast Georgia cities of Clarkesville and Toccoa with the western Upstate South Carolina communities of Westminster, Seneca, Clemson, Easley, and Greenville. State Route 123 (SR 123) is a state highway in the Gifford Pinchot National Forest and Mount Rainier National Park east of Mount Rainier in the U.S. state of Washington.  Located in the counties of Lewis and Pierce, the 16.34 mi long roadway extends through a heavily forested canyon from U.S. Route 12 (US 12) to SR 410 .  First established as a branch of State Road 5 in 1923, the designation of SR 123 has changed from a branch of Primary State Highway 5 (PSH 5) in 1937 to SR 143 during the 1964 highway renumbering and SR 123 in 1967.  The northern terminus of the highway, Cayuse Pass, is closed annually and in late 2006, the Hanukkah Eve windstorm of 2006 washed out a 10.90 mi long segment of the roadway. U.S. Route 331 is a spur of U.S. Route 31.  It currently runs for 151 miles (243 km) from Montgomery, Alabama at U.S. Route 80 and U.S. Route 82 to Santa Rosa Beach, Florida east of Fort Walton Beach at U.S. Route 98.  Unlike U.S. Route 131, U.S. Route 231, and U.S. Route 431, U.S. 331 never intersects with its "parent" route, U.S. Route 31; the two routes come within 4 mi of each other in Montgomery. New Hampshire Route 123 (abbreviated NH 123) is a 63.055 mi secondary north–south state highway in southwestern New Hampshire.  The southern terminus of the route is at the Massachusetts state line in Mason where, as Mason Road, the road continues as an unnumbered local road in the town of Townsend.  The northern terminus, as signed, is at the Connecticut River, where the highway continues west for 0.313 mi to U.S. Route 5 in Westminster, Vermont, as Vermont Route 123 (VT 123).  Route logs, however, place the terminus at New Hampshire Route 12 in Walpole. U.S. Route 23 (US 23) is a long north–south U.S. Highway between Jacksonville, Florida, and Mackinaw City, Michigan.  It is an original 1926 route which originally reached only as far south as Portsmouth, Ohio, and has since been extended. Route 123 is a highway in southwest Missouri.  Its northern terminus is at U.S. Route 54 in Weaubleau; its southern terminus is at U.S. Route 160 in Willard. State Route 123 (SR 123) is a primary state highway in the U.S. state of Virginia.  The state highway runs 29.27 mi from U.S. Route 1 (US 1) in Woodbridge north to the Chain Bridge across the Potomac River into Washington from Arlington.  It goes by three local names.  From its southern terminus to the Occoquan River Bridge, it is known as Gordon Boulevard.  From the Occoquan River Bridge to the city of Fairfax it is known as Ox Road.  North from Fairfax, it is known as Chain Bridge Road.  SR 123 is a partial circumferential highway in Northern Virginia that connects Woodbridge in eastern Prince William County with the independent city of Fairfax and the Fairfax County communities of Vienna, Tysons Corner, and McLean, the last the home of the National Counterterrorism Center and the Central Intelligence Agency.  The state highway also connects all of the major highways that radiate from Washington, including Interstate 95, I-66, US 29, US 50, SR 267, and the George Washington Memorial Parkway.  Furthermore, SR 123 crosses another pair of circumferential highways, I-495 and the Fairfax County Parkway, and SR 7, a major northwest–southeast highway through Northern Virginia.  The state highway is a part of the National Highway System for its entire length. Route 73 is a state highway in the southern part of the U.S. state of New Jersey.  It runs 34.64 mi as an outer bypass of the Camden area from an intersection with U.S. Route 322 in Folsom, Atlantic County to the Tacony-Palmyra Bridge in Palmyra, Burlington County, where it continues into Philadelphia, Pennsylvania as Pennsylvania Route 73.  South of the interchange with the Atlantic City Expressway in Winslow Township, Camden County, Route 73 is a two-lane undivided county-maintained road and is signed as County Route 561 Spur, a spur of County Route 561 (CR 561).  North of the Atlantic City Expressway, the route is maintained by the New Jersey Department of Transportation and is mostly four lanes, with the portion north of the County Route 561 concurrency a divided highway.  North of the U.S. Route 30 (US 30) interchange near Berlin, Route 73 runs through suburban areas of the Delaware Valley, intersecting Route 70 in Marlton, the New Jersey Turnpike and Interstate 295 (I-295) in Mount Laurel Township, Route 38 and Route 41 in Maple Shade Township, Route 90 in Cinnaminson Township, and U.S. Route 130 in Pennsauken Township.
Answer: 1926