There are two business routes for State Route 20 in Northern California. Located in Colusa County, the western section of SR 20 Business follows E Street and Husted Road in a loop south from SR 20 to the city center of Williams. A sparsely signed business route for SR 20 overlaps with SR 49 Business through Grass Valley and Nevada City. The remaining shields for SR 20 Business appear in Nevada City.
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| Eastbound SR 20 Business (E Street) meets Business Loop I-5 (7th Street) in Downtown Williams. 03/31/05 |
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| The Williams Arch is prominently featured along E Street (SR 20 Business) at 6th Street. Williams, a small farming community, is best known by Interstate 5 travelers for the typical fast food and gas franchises near the freeway. 03/31/05 |
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| A diamond interchange joins SR 20 Business (E Street) with Interstate 5 east of 5th Street in Williams. The first ramp connects to the freeway south to Woodland and Sacramento. 03/31/05 |
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| An SR 20 Business trailblazer references the continuation of the route across I-5. The succeeding ramp connects with Interstate 5 north to Willows, Orland, Red Bluff, Redding and Portland, Oregon. 03/31/05 |
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| Leaving the exchange with I-5, SR 20 Business (E Street) intersects 5th Street ahead of the California Northern Railroad line and Downtown Williams. 03/31/05 |
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| The Williams Arch spans SR 20 Business, which follows the original SR 20 alignment along E Street, at 6th Street in Downtown Williams. 03/31/05 |
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| Westbound SR 20 Business advances one block from the Williams Arch to Business Loop I-5 and Old U.S. 99W along 7th Street. 03/31/05 |
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| The first of two shield assemblies for SR 20 Business and SR 49 Business appears at the turn onto Broad Street from Sacramento Street in Nevada City. 08/11/18 |
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| Coyote Street leads SR 20/49 Business north from Broad Street and the Nevada City business district to Washington Street. 08/11/18 |
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| SR 20/49 Business return to SR 20 east & 49 north via the nearby Washington Street on-ramp. 08/11/18 |
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| SR 20/49 Business west separate from the SR 20/49 freeway at Exit 186 for parallel Coyote Street. The routes are unmarked leading south from Washington Street to Downtown Nevada City. 08/11/18 |
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| A half diamond interchange connects the SR 20/49 freeway with SR 20/49 Business along Broad Street in Nevada City. 08/11/18 |
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| Following Sacramento Street south from Broad Street, unsigned SR 20/49 Business span the SR 20/49 freeway at a second half diamond interchange in Nevada City. 08/11/18 |
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| A roundabout joins the west end of Idaho Maryland Road with East Main Street and the north side ramps of the Golden Center Freeway (SR 20/49) in the city of Grass Valley. 07/11/18 |
Page Updated 03-19-2019.
East - Williams
East - Nevada City
