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| California State Route 20 originates from a folded diamond interchange with Interstate 80 at Yuba Pass. 07/11/18 |
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| I-80 diverges southward into Placer County while SR 20 ventures west through Bear Valley to Nevada City and Grass Valley. 07/11/18 |
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| SR 20 navigates through a number of S-curves west through the settlement of Camp Spaulding. 07/11/18 |
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| SR 20 nips northern reaches of Placer County between Camp Spaulding and Bear Valley. 07/11/18 |
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| Bowman Lake Road stems northward from SR 20 to the Sierra Discovery Trail, Clyde Mountain and Bowman Lake. 07/11/18 |
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| Continuing beyond Bowman Lake Road, SR 20 curves toward Lowell Hill Ridge through Bear Valley. 07/11/18 |
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| Crossing the Bear River, westbound SR 20 reenters Nevada County. 07/11/18 |
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| Ascending out of Bear Valley, SR 20 gains 600 feet in elevation along the south slopes of Lowell Hill Ridge. 07/11/18 |
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| SR 20 west from I-80 to Nevada City is the Yuba Donner Scenic Byway. 07/11/18 |
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| Rising to 5,200 feet above sea level, SR 20 winds through a series of switchbacks northward across Lowell Hill Ridge. 07/11/18 |
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| SR 20 straightens out somewhat ahead of the Omega scenic overlook. 07/11/18 |
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| SR 20 navigates through a series of S-curves northwest from Sardine Spring to Skillman Flat. 07/11/18 |
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| Skillman Horse Camp lies south of SR 20 on Burlington Ridge. 07/11/18 |
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| Washington Road meanders north from SR 20 six miles to the community of Washington along the South Fork of the Yuba River. 07/11/18 |
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| The Jefferson Creek Scenic Overlook lies just west of Washington Road on the north side of SR 20. 07/11/18 |
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| Advancing west through Tahoe National Forest, SR 20 traverses areas of Washington Ridge to mile marker 30.00. 07/11/18 |
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| SR 20 westbound reaches White Cloud Campground. 07/11/18 |
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| Continuing west from White Cloud Campground along Washington Ridge. 07/11/18 |
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| SR 20 lowers to 4,000 feet ahead of the turn off for Conservation Road. 07/11/18 |
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| Scotts Flat Road stems south from SR 20 on Harmony Ridge to Scotts Flat Reservoir. 07/11/18 |
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| SR 20 gradually decreases in elevation from Harmony Ridge west to Nevada City. 07/11/18 |
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| Curving south between Sugarloaf Mountain and Eagle Ravine, SR 20 expands to four lanes ahead of SR 49 and the Virginia City line. 07/11/18 |
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| An at-grade intersection joins SR 20 west with Uren Street east and SR 49 north toward Downieville. 07/11/18 |
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| SR 49 travels 42 miles south from Downieville to combine with SR 20 west along the Golden Center Freeway through both Virginia City and Grass Valley. 07/11/18 |
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| Exit 186 departs immediately south of the merge between SR 20 west / 49 south for Coyote Street (SR 20 Business/49 Business) to Downtown Nevada City. 07/11/18 |
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| Constructed in the 1960s, the Golden Center Freeway leads SR 20 west / 49 south 5.1 miles to Empire Street in the city of Grass Valley. 07/11/18 |
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| Constructed in the 1960s, the Golden Center Freeway leads SR 20 west & 49 south 5.1 miles to Empire Street in the city of Grass Valley. 07/11/18 |
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| Back to back half diamond interchanges add traffic from Broad Street and Sacramento Streets to the Golden Center Freeway westbound in Nevada City. 07/11/18 |
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| Heading through south Nevada City, SR 20/49 approach the unincorporated community of Gold Flat at Exit 185. 07/11/18 |
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| The Grass Valley city center lies four miles further. Beyond their separation, SR 20 turns west to Marysville while SR 49 continues another 23 miles to Auburn. 07/11/18 |
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| Entering the diamond interchange (Exit 185) with Gold Flat Road east and Ridge Road west on SR 20/49. 07/11/18 |
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| Banner Lava Cap Road spans the Golden Center Freeway high above SR 20/49, a half mile ahead of Exit 183B for Brunswick Road. 07/11/18 |
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| A six-ramp parclo interchange (Exit 183B) joins SR 20/49 with a sprawling retail corridor along Brunswick Road and parallel Main Street. 07/11/18 |
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| Auxiliary lanes expand the Golden Center Freeway between Brunswick Road and Dorsey Drive (Exit 183A). The forthcoming diamond interchange opened to traffic on November 10, 2014.1 07/11/18 |
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| Groundbreaking for the $15 million Dorsey Drive Interchange took place on April 29, 2013. The two-phase project widened Dorsey Drive to five lanes and improved 1.4 miles of SR 20/49. Aesthetic enhancements were added to concrete bridge walls, railings and street lighting. 1,272 linear feet of sound walls matching the project color scheme were installed as well.2 07/11/18 |
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| The ensuing exit joins SR 20 west / 49 south with East Main Street in Grass Valley. 07/11/18 |
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| An auxiliary lane opens westbound from Dorsey Drive to Exit 182B for East Main Street and Idaho Maryland Road east. 07/11/18 |
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| Exit 182B ties into a roundabout with East Main Street and Idaho Maryland Road. The roundabout was completed in 2008. 07/11/18 |
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| The north end of SR 174 ties into SR 20/49 (Golden Center Freeway) at Exit 182A. Truckers are not advised along the 13.3 mile long state route south to Colfax. 07/11/18 |
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| A split diamond interchange (Exit 182A) joins SR 20 west / 49 south with Bennett Street, Bank Street and SR 174 (Colfax Avenue) east by Downtown Grass Valley. 07/11/18 |
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| A service road (Tinloy Street) links the westbound off-ramp at Exit 182A with SR 174 (Colfax Avenue) east and Auburn Street (SR 20 Business/49 Business). The city of Colfax lies at the south end of SR 174 along Interstate 80. 07/11/18 |
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| SR 20 west and SR 49 south part ways 0.75 miles southwest of the Bennett Street underpass in Grass Valley. 07/11/18 |
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| Advancing south to Boston Ravine, a third lane opens from the SR 174 entrance ramp to the diamond interchange with Empire Street. 07/11/18 |
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| SR 20 west and SR 49 south split at Empire Street. Empire Street ties in from Auburn Street (SR 49 Business) and Empire Mine State Historic Park to the east. 07/11/18 |
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| Leading away from SR 49 (Golden Center Freeway), westbound SR 20 meets Mill Street near the Nevada County Fairgrounds at a folded diamond interchange. 07/11/18 |
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| A grade separation takes Brighton Street across SR 20 west at this confirming marker. 07/11/18 |
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| Marysville lies 34 miles to the west of Grass Valley via State Route 20. 07/11/18 |
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| A grade separation takes Ponderosa Way across SR 20 at Deadmans Flat. West from here, SR 20 drops from around 2,300 feet above sea level along a 6% grade into the Central Valley. 07/11/18 |
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| SR 20 remains an access controlled expressway west to Penn Valley. The state route passes over Rex Reservoir Road here. 07/11/18 |
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| Entering Penn Valley, truckers along SR 20 west are advised of the 6% grade preceding the Yuba County line. The state route drops from 1,400 feet to 900 feet in elevation along the ensuing stretch. 07/11/18 |
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| Penn Valley Drive north and Rough and Ready Highway south come together at a signalized intersection with SR 20 outside Penn Valley. 07/11/18 |
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| SR 20 travels north of the community of Penn Valley along a controlled access bypass. 07/11/18 |
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| Nevada County mile post R 6.00 stands along SR 20 west near Squirrel Creek. 07/11/18 |
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| Pleasant Valley Road winds north from SR 20 at Penn Valley to the community of Lake Wildwood, Bridgeport on the Yuba River and unincorporated French Corral. 07/11/18 |
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| Pleasant Valley Road links SR 20 with adjacent Penn Valley Drive to the south. 07/11/18 |
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| The two lane expressway along SR 20 parallels Penn Valley Drive (old SR 20) just to the north. The two roadways converge one mile west of Pleasant Valley Road. 07/11/18 |
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| Marysville lies 27 miles west of Penn Valley. Williams, where SR 20 meets I-5, follows in 63 miles. 07/11/18 |
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| Westbound SR 20 at Poker Flat Road and Nevada County mile marker 3.00. 07/11/18 |
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| A number of S-curves lead SR 20 west through Slacks Ravine. Portions of the former alignment of SR 20 remain for local access, including a segment off of Crescenzi Drive. 07/11/18 |
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| Winding west between Riffle Box Ravine and Peardon Hill along SR 20. 07/11/18 |
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| State Route 20 crosses the Yuba County line westbound between Mooney Flat Road and Meade Hill. 07/11/18 |
Page Updated 03-20-2019.
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