Sausalito to Yuma Road Trip: Desert Highways & Coastal Farewell

This road trip begins at the foot of the Golden Gate Bridge in Sausalito, where the Pacific breeze carries the scent of salt and eucalyptus. Your destination is Yuma, Arizona—one of the sunniest cities on earth, sitting at the confluence of the Colorado and Gila rivers. The drive covers roughly 700 miles and takes about 12 hours of pure driving, but stretching it over two days reveals layers of California’s and Arizona’s heartland.

Historically, this route shadows parts of the Old Spanish Trail and the Southern Emigrant Trail. In the 1850s, thousands crossed the Colorado River near Yuma on ferries to reach the gold fields. Today, you follow Interstate 5 south from Sausalito, then cut east on CA-78 near Brawley, before merging onto I-8 east to Yuma.

The focus here is on the more direct southern route via CA-78, which cuts through the Anza-Borrego Desert and the Imperial Valley. This is the road less traveled, offering raw desert landscapes and a sense of isolation.

Leaving Sausalito, you merge onto US-101 south and quickly connect to I-80 east across the Bay Bridge. From there, I-580 south takes you to I-5, the main artery through the Central Valley. The first refuel stop should be around Santa Nella (mile 150) or Los Banos, where diesel and premium gas are widely available.

As you approach the Grapevine (Tejon Pass), grades of 6% for 5 miles require extra caution for RVs and trailers. Gas prices in the Grapevine area are typically $0.50-$1.00 higher than in the Central Valley, so fill up before the climb. Once you descend into the Mojave, fuel becomes sparse between Lebec and Gorman (about 20 miles).

• Total fuel cost estimate (2.5 tank fill-ups at 20 mpg): $210-$260 depending on gas prices.
• Optimal refuel stops: Santa Nella (exit 372), Wheeler Ridge (exit 223), Brawley (exit 76 on CA-78).
• Avoid fueling in the Anza-Borrego stretch—no stations for 80 miles.

Cell service: AT&T and Verizon work well on I-5 but drop off significantly on CA-78 east of the Salton Sea. Download offline maps before leaving Brawley. The final 30 miles into Yuma on I-8 are covered by all providers.

Anza-Borrego Desert State Park is the centerpiece of the CA-78 segment. The park spans 600,000 acres of badlands, palm oases, and wildflower fields in spring. The visitor center near Borrego Springs has exhibits on the Kumeyaay people and desert geology.

• Best short hike: Palm Canyon Trail (1.5 miles round trip) leads to a native fan palm grove.
• Scenic drive: Borrego Salton Seaway (S-22) offers views of the Salton Sea and the Chocolate Mountains.
• Local commerce: Borrego Springs has a farmers' market on Sundays (seasonal) selling dates, citrus, and local pottery.

The Salton Sea, California’s largest lake, is a surreal stop. Its shoreline is littered with dried fish bones and salt crusts. The Sonny Bono Salton Sea National Wildlife Refuge hosts migratory birds from November to March. how to find the best stops and hidden gems between cities often highlights this lesser-known spot.

In the Imperial Valley, agriculture dominates. Along CA-78 you’ll pass fields of lettuce, broccoli, and sugar beets. The town of Westmorland has the “Wisteria” date shop—try a date shake (cash only). The valley’s economy relies on the All-American Canal, which diverts Colorado River water to the fields.

I-5 through the Grapevine is heavily patrolled by CHP, especially near the summit (4144 ft). Speed limits drop to 55 mph on curves. In summer, desert pavement temperatures can exceed 160°F—check tire pressure before descending into the Mojave. Carry at least one gallon of water per person when crossing the Anza-Borrego stretch.

Family-friendly stops include the California Science Center in Los Angeles (detour on I-5) and the Living Desert Zoo in Palm Desert (near I-10 alternate). For a quick break, the Buttonwillow rest area (mile 257) has a playground and clean restrooms.

• Pet-friendly framework: All National Forest lands and Anza-Borrego allow leashed dogs. The Salton Sea state park areas require dogs on 6-ft leashes. Yuma’s Riverfront Park has a designated dog beach.
• Fatigue management: The long straight section of CA-78 between Ocotillo and the Imperial Valley is hypnotic. Use the Plaster City rest stop (mile 13 on CA-78) for a 20-minute nap.
• Infrastructure safety: The CA-78 bridge over the All-American Canal has no guardrails—slow down to 40 mph.

UNESCO World Heritage Sites are not directly on route, but the “Sacred Sites of the Kumeyaay” (a tentative listing) includes areas near the Mexican border, about 20 miles south of the route. For cultural enrichment, visit the Imperial Valley Desert Museum in Ocotillo (free admission).

In Yuma, the historic downtown district on Main Street offers galleries and the Yuma Territorial Prison State Historic Park. The prison housed inmates from 1876 to 1909 and now has a museum on prisoner artifacts.