As one of the lowest highways in the country, Interstate 8 drops below sea level in the Imperial Valley and travels through many mountain passes as it connects San Diego, California to Casa Grande, Arizona. For its entire duration, I-8 only intersects with one other U.S. route—U.S. 95—but parallels the Old U.S. 80.

I-8 is part of the National Highway System and is considered an essential part of the nation’s economy, defense, and mobility. And the freeway from the eastern junction with California State Route 98 (SR 98) to the east end is part of the Juan Bautista de Anza National Historic Trail tour route.

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We're giving you everything you need to know about traveling on I-8—where it runs, the best places to eat, and the best don’t miss sites.

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What is an interstate highway?

While you may have heard about highways and freeways, interstate highways are a series of roadways that connect states. They stretch over the mainland United States covering more than 47,000 miles, with some interstates running through multiple states.

Whereas most highways are named, interstates are designated by a number, with the lowest numbers found in the west and south. Interstates running north-south are given an odd number, while those running east-west are given an even number. And beltways and loops around cities are given a three-digit number.

What states does I-8 run through?

Although many interstates cross multiple states, I-8 is a continuous highway running through only two states. While the route for the interstate hasn’t changed and isn’t undergoing expansion, it has undergone construction for widening to accommodate an increase in travelers. Currently, I-8 runs through:

California

: 169.92

Arizona

: 178.33

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Everything you need to know about driving in San Diego

Major interchanges on I-8

While I-8 may only span California and Arizona, several interchanges merge with it, so keep your eyes open for them. Here are the major interchanges coming off of I-8:

I-5 in

San Diego

, CA

I-15 in San Diego, CA

I-10 in

Casa Grande

, AZ

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Best places to eat along I-8

Whether you’re taking a road trip to San Diego or hopping on I-8 for a day trip with the kids, you will work up an appetite. And just off I-8, you’ll find loads of unique places to grab a quick snack or a sit-down meal.

Be sure to grab a bite at some of these destinations if you’re driving along I-8:

Lutes Casino

(Yuma, AZ): An old pool hall and restaurant from the 1940s decked out in movie and advertising memorabilia, Lute Casino is a must-stop if you’re traveling on I-8. Your taste buds will thank you with a wide range of burgers, hot dogs, and classic Mexican dishes. Don’t forget to try their special ‘potato tacos’ or Lutes Special. Opens daily at 10 a.m.

Eddie's Grill

(Yuma, AZ): A family-style restaurant serving up scratch-cooked favorites like charbroiled burgers, homemade soups, and shrimp fettuccine alfredo. And to satisfy your sweet tooth, check out the homemade desserts and shakes! Don’t forget to ask about their military and seniors discount. Opens daily at 7 a.m.

Hacienda Casa Blanca Mexican Restaurant & Cantina

(El Cajon, CA): A staple Mexican eatery and bar along I-8, you’ll feel like you’re in Mexico at Hacienda Casa Blanca Mexican Restaurant & Cantina. With brightly colored decor, live music, and some killer Mexican staples, you’ll be back every time you pass by. Opens Monday to Saturday at 10 a.m., and Sunday at 9 a.m.

Brigantine Seafood Restaurant

(La Mesa, CA): Brigantine serves up some of San Diego’s finest if you're in the mood for seafood. Check out their award-winning fish tacos and best-selling marinated grilled swordfish; everything is always fresh and delicious. Check their website for the hours.

Rudford's Restaurant

(San Diego, CA): An old-school circa-1949 restaurant serving up classic diner fare around the clock. Whether you’re craving a midnight snack or looking for a bit of lunch, Rudford’s is open 24/7. And don’t forget to check out their dessert menu featuring ‘build your own shakes’.

Pro Tip Before you hit one of these gems along I-8, make sure you check the hours—they vary, and you don’t want to miss any of these!

What is there to do on I-8?

There’s lots to see and do in both California and Arizona, and along I-8, you’ll find a bit of everything. If you’re an avid outdoor adventurer, there are plenty of parks—and even if you’re not, you’ll keep yourself busy at conservation areas or museums.

Here are some of the best stops along I-8:

Yuma Crossing National Heritage

Area in Yuma, Az

Yuma Territorial Prison Park

in Yuma, AZ

JA Cooley Museum

in San Diego, CA

SeaWorld San Diego

in San Diego, CA

Water Conservation Garden

in El Cajon, CA

MORE:

The 7 best California road trips

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