California State Route 104

State Route 104
Route information
Defined by Streets and Highways Code § 404
Maintained by Caltrans
Length:	36.04 mi[1] (58.00 km)
Major junctions
West end:	SR 99 near Galt
East end:	SR 49 in Sutter Creek
Highway system
State highways in California List Pre-1964 History Unconstructed Deleted Freeway Scenic ← SR 103 I‑105 →

State Route 104 (SR 104) is a west–east state highway in California's Central Valley. It connects State Route 99 near Galt to State Route 49 in Sutter Creek via the city of Ione. It is known as Twin Cities Road from its western terminus up until just before Ione. Heading west past its western terminus along Twin Cities Road will lead to Interstate 5 and eventually to an end at State Route 160 north of Walnut Grove. A review of older maps indicates that the original signage was US Highway 104.^[2]

Route description

The route begins in Galt in Sacramento County at SR 99. It then heads eastward, forming the northern boundary of the city of Galt. The route turns northeast, passing through Herald, near Rancho Seco Nuclear Generating Station and on to the community of Clay before entering Amador County. It then continues past Mule Creek State Prison and begins a short overlap with SR 124 in Ione. Afterwards, it exits the town and has another short overlap with SR 88, where it goes through the community of Sunnybrook. Its eastern terminus is at SR 49 in Sutter Creek.^[3]

Major intersections

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions).^[4] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile [4][5][6]	Destinations	Notes
Sacramento SAC 0.00-17.69	Galt	0.00	CR E13 (Twin Cities Road) – Walnut Grove	Continuation beyond SR 99
		0.00	SR 99 – Sacramento, Stockton	Interchange; west end of SR 104
Amador AMA 0.00-10.07	Ione	R5.77	SR 124 north (Plymouth Highway) / Shakeley Lane – Plymouth, Placerville	West end of SR 124 overlap
		R5.96	SR 124 south (Church Street) – Stockton	East end of SR 124 overlap
		8.20 7.39[N 1]	SR 88 west / Jackson Valley Road – Stockton	West end of SR 88 overlap
		12.68[N 1] 8.39	SR 88 east – Martell, Jackson	East end of SR 88 overlap
	Sutter Creek	10.07	SR 49 – Sutter Creek, Jackson	East end of SR 104
		10.07	Ridge Road	Continuation beyond SR 49
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

References