Anchor ads are not supported on this page.

4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs

Get up-close and personal with boulder stacks in the southernmost reaches of Anza-Borrego Desert State Park.

Drive an hour east on Interstate 8 from San Diego toward El Centro and you won't fail to be impressed by the enormous stacks of rounded boulders thrusting skyward over the high-desert landscape. How did these boulder piles get there? Are they the "sweepings of the world," as Padre Pedro Font characterized similar formations during his travels through Anza-Borrego on the 1775 Anza expedition? Or is there a more prosaic geologic explanation?

Here's a way to get up close and familiar with some of the boulder piles near I-8: Take the Jacumba exit off I-8, which is 75 miles east of Mission Valley. Turn sharply right (west) and follow a smoothly graded, unpaved frontage road two miles to the DeAnza Springs clothing-optional resort. The resort's 500 acres include recreational facilities plus scattered motorhomes and permanent residences amid a backdrop of boulder-studded hills. At the gate, tell the attendant (or use the intercom if no one's there) that you want to hike in the area, and ask permission to park. A fee of $5 per car is charged. You will be directed to park your car in the northeast corner of the resort property. Remember to observe the posted speed limit of 5 miles per hour inside the resort, which will help keep the dust down. (DeAnza Springs' phone number is 619-766-4301.)

Sponsored
Sponsored

From the parking area, a trail delineated by stones dips into a ditch, quickly veers left, and joins an old jeep road swinging north toward a number of interesting giant boulder piles. You soon pass through a gap in a wire fence marking your transition between the resort property and lands inside Anza-Borrego Desert State Park. The undulating hills and valleys ahead have been used for many years by the Sierra Club's San Diego chapter for outing-leader training and for navigation practice for students enrolled in the club's Wilderness Basics Course. You can stick with the jeep roads that lace the area or strike off in nearly any direction to climb amid the boulders.

So what's the deal with the boulders? Nothing more than subsurface and surface weathering of a rising mass of granitic rock. Groundwater infiltrates the joints (cracks or planes of weakness) in the rock mass well before any overlying layers of rock or soil have eroded away. Gaps open up as the rock is subject to slow but steady decomposition by physical forces and chemical processes. Further, the mineral grains on any sharp corner of a rock surface will tend to loosen and fall away easier, thus contributing to an overall rounding effect. The stacks of rounded boulders you presently see are like the tiniest tips of icebergs. They will "rot away" completely in the next few tens of thousands of years. Meanwhile, more rock will rise to replace them.

When you return to DeAnza Springs, perhaps a bit hot and footsore, consider using the resort's recreational facilities (for a daily fee): hot showers, indoor pool, spa, and restaurant. Clothing-optional, of course.

The latest copy of the Reader

Here's something you might be interested in.
Submit a free classified
or view all
Previous article

At Comedor Nishi a world of cuisines meet for brunch

A Mexican eatery with Japanese and French influences

Drive an hour east on Interstate 8 from San Diego toward El Centro and you won't fail to be impressed by the enormous stacks of rounded boulders thrusting skyward over the high-desert landscape. How did these boulder piles get there? Are they the "sweepings of the world," as Padre Pedro Font characterized similar formations during his travels through Anza-Borrego on the 1775 Anza expedition? Or is there a more prosaic geologic explanation?

Here's a way to get up close and familiar with some of the boulder piles near I-8: Take the Jacumba exit off I-8, which is 75 miles east of Mission Valley. Turn sharply right (west) and follow a smoothly graded, unpaved frontage road two miles to the DeAnza Springs clothing-optional resort. The resort's 500 acres include recreational facilities plus scattered motorhomes and permanent residences amid a backdrop of boulder-studded hills. At the gate, tell the attendant (or use the intercom if no one's there) that you want to hike in the area, and ask permission to park. A fee of $5 per car is charged. You will be directed to park your car in the northeast corner of the resort property. Remember to observe the posted speed limit of 5 miles per hour inside the resort, which will help keep the dust down. (DeAnza Springs' phone number is 619-766-4301.)

Sponsored
Sponsored

From the parking area, a trail delineated by stones dips into a ditch, quickly veers left, and joins an old jeep road swinging north toward a number of interesting giant boulder piles. You soon pass through a gap in a wire fence marking your transition between the resort property and lands inside Anza-Borrego Desert State Park. The undulating hills and valleys ahead have been used for many years by the Sierra Club's San Diego chapter for outing-leader training and for navigation practice for students enrolled in the club's Wilderness Basics Course. You can stick with the jeep roads that lace the area or strike off in nearly any direction to climb amid the boulders.

So what's the deal with the boulders? Nothing more than subsurface and surface weathering of a rising mass of granitic rock. Groundwater infiltrates the joints (cracks or planes of weakness) in the rock mass well before any overlying layers of rock or soil have eroded away. Gaps open up as the rock is subject to slow but steady decomposition by physical forces and chemical processes. Further, the mineral grains on any sharp corner of a rock surface will tend to loosen and fall away easier, thus contributing to an overall rounding effect. The stacks of rounded boulders you presently see are like the tiniest tips of icebergs. They will "rot away" completely in the next few tens of thousands of years. Meanwhile, more rock will rise to replace them.

When you return to DeAnza Springs, perhaps a bit hot and footsore, consider using the resort's recreational facilities (for a daily fee): hot showers, indoor pool, spa, and restaurant. Clothing-optional, of course.

Comments
Sponsored

The latest copy of the Reader

Here's something you might be interested in.
Submit a free classified
or view all
Previous article

Born & Raised offers a less decadent Holiday Punch

Cognac serves to lighten the mood
Next Article

Live Five: Rebecca Jade, Stoney B. Blues, Manzanita Blues, Blame Betty, Marujah

Holiday music, blues, rockabilly, and record releases in Carlsbad, San Carlos, Little Italy, downtown
Comments
Ask a Hipster — Advice you didn't know you needed Big Screen — Movie commentary Blurt — Music's inside track Booze News — San Diego spirits Classical Music — Immortal beauty Classifieds — Free and easy Cover Stories — Front-page features Drinks All Around — Bartenders' drink recipes Excerpts — Literary and spiritual excerpts Feast! — Food & drink reviews Feature Stories — Local news & stories Fishing Report — What’s getting hooked from ship and shore From the Archives — Spotlight on the past Golden Dreams — Talk of the town The Gonzo Report — Making the musical scene, or at least reporting from it Letters — Our inbox Movies@Home — Local movie buffs share favorites Movie Reviews — Our critics' picks and pans Musician Interviews — Up close with local artists Neighborhood News from Stringers — Hyperlocal news News Ticker — News & politics Obermeyer — San Diego politics illustrated Outdoors — Weekly changes in flora and fauna Overheard in San Diego — Eavesdropping illustrated Poetry — The old and the new Reader Travel — Travel section built by travelers Reading — The hunt for intellectuals Roam-O-Rama — SoCal's best hiking/biking trails San Diego Beer — Inside San Diego suds SD on the QT — Almost factual news Sheep and Goats — Places of worship Special Issues — The best of Street Style — San Diego streets have style Surf Diego — Real stories from those braving the waves Theater — On stage in San Diego this week Tin Fork — Silver spoon alternative Under the Radar — Matt Potter's undercover work Unforgettable — Long-ago San Diego Unreal Estate — San Diego's priciest pads Your Week — Daily event picks
4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
Close

Anchor ads are not supported on this page.

This Week’s Reader This Week’s Reader