Summer Splash : Magic Mountain Reaches Out to the Wet Set : The company will open a $35-million water theme park next door to its Valencia site in June. It’ll have plenty of competition.

Six Flags Magic Mountain-- which has been on a thrill-ride building spree in recent years, adding an attraction a year to the park since 1989--has gone a step further this year.

It has built a whole new park.

Six Flags Hurricane Harbor, a themed water park that company officials said cost about $35 million, will open next door to Magic Mountain in Valencia on June 16.

The entrances to the two parks, which will charge separate admissions, are about 20 feet apart.

Six Flags officials hope that having a second park will attract visitors from greater distances.

“It provides guests with one location they can visit two days in a row,” said Bonnie Rabjohn, a Six Flags spokeswoman. “We’re positioning it as a two-day [event].”

The 22-acre Hurricane Harbor, the first new amusement park built in California since 1986, is about one-fifth the size of its 24-year-old neighbor, Magic Mountain. But it is similar in size to two other Southland water parks, Raging Waters in San Dimas and Wild Rivers in Irvine, and more than twice as big as the 10-acre Oasis Water Park in Palm Springs.

Hurricane Harbor, Rabjohn said, “is themed to a lost civilization hidden within a pirate hideaway. Each of the attractions are themed differently to tell a different story of this ancient civilization.”

The attractions, with names such as Lost Temple Rapids, Shipwreck Shores and Lightning Falls, include six tube slides (two enclosed), three speed slides (one enclosed), a four-person family raft ride, a wave pool, a slow-moving river ride and family and children’s areas.

The park, of course, will also include shops and restaurants. Admission to Hurricane Harbor will be $16 for adults and $10 for children under 48 inches and seniors 55 and older. Children 2 and younger will be admitted free. A combo ticket to Hurricane Harbor and Magic Mountain will cost $42, a savings of $4. (Admission to Magic Mountain alone is $30.)

Magic Mountain itself will premiere its “Batman Forever Stunt Show”--featuring high-tech special effects based on the upcoming movie--on June 3, and its Batman fireworks show opens June 17.

The Hurricane Harbor/Magic Mountain complex, by Interstate 5 at Mountain Parkway in Valencia, will be called Six Flags California. It’s the state’s first multi-gated amusement-park facility, but the third under the Six Flags umbrella. Others are in Houston and Jackson, N.J.

*

Hurricane Harbor, which will close in November for the winter, is not the summer’s only new attraction. Among the others:

Disneyland will premiere a stage show based on “Pocahontas,” consisting of music from the upcoming animated film. The park’s newest thrill ride, Indiana Jones Adventure, which opened March 3, is expected to remain a popular attraction throughout the summer--and beyond. Ball Road at Santa Ana Freeway, Anaheim.

Knott’s Berry Farm, celebrating its 75th anniversary, opens its Jaguar! roller-coaster on June 17. Special diamond anniversary shows include “Diamonds on Ice: A Knott’s Celebration,” “Diamonds in the Night Fireworks Spectacular” and “Siege of Fort Knott Stunt Extravaganza.” 8039 Beach Blvd., Buena Park.

Oasis Water Park’s new attraction, the Black Widow, is a 450-foot water slide for two that drops 50 feet into a new catch pool. 1500 Gene Autry Trail, Palm Springs.

Raging Waters opened Splash Island Adventure, a slide attraction, this month. It will debut a bungee jump in June and the “Aquatic Bungee Spectacular Stunt Show” on July 4. 111 Raging Waters Drive, San Dimas.

San Diego Wild Animal Park recently launched Dinosaur Mountain, a four-acre walk-through forest featuring 18 robotic dinosaurs. The extended-hours “Park at Dark” program, which will include monorails, musical entertainment and animal shows, starts June 16. 15500 San Pasqual Valley Road, Escondido.

Sea World opened Shamu’s Happy Harbor, a tropical-themed interactive play area for kids and adults, last month. “Baywatch at Sea World,” a water ski show, opens next weekend. 1720 South Shores Road, San Diego.

Universal Studios Hollywood will open “Casper: Behind the Screams” and “Apollo 13,” behind-the-scenes looks at upcoming films. Later in the summer, it will introduce “Waterworld--A Live Sea War Spectacular,” a stunt show inspired by the upcoming movie. 100 Universal City Plaza, Universal City.

Wild Rivers, celebrating its 10th anniversary, will launch Chaos, an enclosed slide that will feature 360-degree turns, lightning, fog and sound effects. 8770 Irvine Center Drive, Irvine.