State Route 104 is a west–east state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 in California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

's Central Valley. It connects State Route 99

California State Route 99

California State Route 99 , commonly known as Highway 99 or, simply, as 99 , is a north–south state highway in the U.S. state of California, stretching almost the entire length of the Central Valley...

 near Galt

Galt, California

Galt is a city in Sacramento County, California, USA. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area...

 to State Route 49

California State Route 49

State Route 49 is a north–south state highway in the U.S. state of California that passes through many historic mining communities of the 1849 California gold rush. Highway 49 is numbered after the "49ers", the waves of immigrants who swept into the area looking for gold, and a portion of it...

 in Sutter Creek

Sutter Creek, California

Sutter Creek is a city in Amador County, California, United States. The population was 2,501 at the 2010 census, up from 2,303 at the 2000 census...

 via the city of Ione

Ione, California

Ione is a city in Amador County, California, United States. The population was 7,918 at the 2010 census, up from 7,129 at the 2000 census. Once known as "Bed-Bug" and "Freeze Out," Ione was an important supply center on the main road to the Mother Lode and Southern Mines during the California Gold...

. 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

California State Route 160

State Route 160 is a state highway in the U.S. state of California consisting of two sections. The longer, southern, section is a scenic highway through the alluvial plain of the Sacramento River, linking SR 4 in Antioch with Sacramento via the Antioch Bridge...

 north of Walnut Grove

Walnut Grove, California

Walnut Grove is a census-designated place in Sacramento County, California, United States. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area...

.

Route description

The route begins in Galt

Galt, California

Galt is a city in Sacramento County, California, USA. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area...

 in Sacramento County

Sacramento County, California

Sacramento County is a county in the U.S. state of California. Its county seat is Sacramento, which is also the state capital. As of 2010 the county had a population of 1,418,788....

 at SR 99

California State Route 99

California State Route 99 , commonly known as Highway 99 or, simply, as 99 , is a north–south state highway in the U.S. state of California, stretching almost the entire length of the Central Valley...

. It then heads eastward, forming the northern boundary of the city of Galt. The route turns northeast, passing near the community of Clay

Clay, California

Clay is a census-designated place in Sacramento County, California. Clay sits at an elevation of . The 2010 United States census reported Clay's population was 1,195.-Geography:...

, and enters Amador County

Amador County, California

Amador County is a county located in the Sierra Nevada of the U.S. state of California. As of the 2010 census, the population was 38,091. The county seat is Jackson.Amador County bills itself as "The Heart of the Mother Lode" and lies within the Gold Country...

, where it begins a short overlap with SR 124

California State Route 124

State Route 124 is a state highway in the U.S. state of California that runs from south of Ione to Route 16 near Waits Station in Amador County.-Route description:This route is part of the California Freeway and Expressway System....

 in Ione

Ione, California

Ione is a city in Amador County, California, United States. The population was 7,918 at the 2010 census, up from 7,129 at the 2000 census. Once known as "Bed-Bug" and "Freeze Out," Ione was an important supply center on the main road to the Mother Lode and Southern Mines during the California Gold...

. Afterwards, it exits the town and has another short overlap with SR 88

California State Route 88

State Route 88 , also known as the Carson Pass Highway, is a California State Highway that travels in an east–west direction, from Stockton, crossing the Sierra Nevada at Carson Pass, and ending at the border with Nevada, whereupon it becomes Nevada State Route 88, eventually terminating at U.S...

, where it goes through the community of Sunnybrook

Sunnybrook, California

Sunnybrook is an unincorporated community in Amador County, California. It is located on Mountain Spring Creek east of Ione. It lies at an elevation of 784 feet .The Vogans post office was operational from 1888 to 1889....

. Its eastern terminus is at SR 49

California State Route 49

State Route 49 is a north–south state highway in the U.S. state of California that passes through many historic mining communities of the 1849 California gold rush. Highway 49 is numbered after the "49ers", the waves of immigrants who swept into the area looking for gold, and a portion of it...

 in Sutter Creek

Sutter Creek, California

Sutter Creek is a city in Amador County, California, United States. The population was 2,501 at the 2010 census, up from 2,303 at the 2000 census...

.

Major intersections

Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

{| class=wikitable
!County
!Location
!Postmile

!Destinations
!Notes
|-
|rowspan=2|Sacramento

Sacramento County, California

Sacramento County is a county in the U.S. state of California. Its county seat is Sacramento, which is also the state capital. As of 2010 the county had a population of 1,418,788....

SAC 0.00-17.69
|rowspan=2|Galt

Galt, California

Galt is a city in Sacramento County, California, USA. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area...

|0.00
|
|Continuation beyond SR 99
|-
|0.00
|
|Interchange
|-
|rowspan=6|Amador

Amador County, California

Amador County is a county located in the Sierra Nevada of the U.S. state of California. As of the 2010 census, the population was 38,091. The county seat is Jackson.Amador County bills itself as "The Heart of the Mother Lode" and lies within the Gold Country...

AMA 0.00-10.07
|rowspan=2|Ione

Ione, California

Ione is a city in Amador County, California, United States. The population was 7,918 at the 2010 census, up from 7,129 at the 2000 census. Once known as "Bed-Bug" and "Freeze Out," Ione was an important supply center on the main road to the Mother Lode and Southern Mines during the California Gold...

|bgcolor=#ddffdd|R5.77
|bgcolor=#ddffdd|
|bgcolor=#ddffdd|West end of SR 124 overlap
|-bgcolor=#ddffdd
|R5.96
|
|East end of SR 124 overlap
|-
|
|bgcolor=#ddffdd|8.20
7.39Indicates that the postmile represents the distance along SR 88

California State Route 88

State Route 88 , also known as the Carson Pass Highway, is a California State Highway that travels in an east–west direction, from Stockton, crossing the Sierra Nevada at Carson Pass, and ending at the border with Nevada, whereupon it becomes Nevada State Route 88, eventually terminating at U.S...

 rather than SR 104.
|bgcolor=#ddffdd|
|bgcolor=#ddffdd|West end of SR 88 overlap
|-
|
|bgcolor=#ddffdd|12.68
8.39
|bgcolor=#ddffdd|
|bgcolor=#ddffdd|East end of SR 88 overlap
|-
|rowspan=2|Sutter Creek

Sutter Creek, California

Sutter Creek is a city in Amador County, California, United States. The population was 2,501 at the 2010 census, up from 2,303 at the 2000 census...

|10.07
|
|
|-
|10.07
|Ridge Road
|Continuation beyond SR 49

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