High tides and massive swells swashed along Los Angeles area beaches Saturday, and cities and residents alike took precautions to protect homes and businesses.

Video from Sky5 showed high tides cut across the sand from Long Beach to Huntington Beach, coming dangerously close to hundreds of homes.

In Long Beach, aerial footage showed crews working feverishly to shore up the sand berm that separated the rising ocean waters and multimillion-dollar oceanfront properties after the barrier partially collapsed Saturday night.

“And as soon as they build it, the waves knock it down,” said Long Beach resident Lauren Green.

The ocean swelled with dangerous currents thanks to Post-Tropical Cyclone Kay, which, while not having a major impact locally, still made its presence felt.

In Long Beach, high tides were expected around 10 a.m. and 10 p.m. Saturday, and around 10:45 a.m. and 10:45 p.m. on Sunday.

In Seal Beach, a restaurant that’s set to open in a few months nearly flooded, its owners told KTLA.

Rosie Ritchie, co-owner of the Beach House Seal Beach, said everyone was “very nervous” Friday night.

“We got a call yesterday morning from our contractor and he said, ‘You guys have got to get down here. This is flooded.’ We shot down here and spent the whole day doing sandbags, trying to communicate with the city and let them know what was happening,” Ritchie said, adding that they’re “nervous for tonight as well.”

Fellow co-owner Brian Kyle noted that “we didn’t expect this to happen.”

“Our biggest problem is we haven’t gotten any help from the city at all,” he said, noting that a nearby bike path is covered in water and no pumps are working to clear the flooding. “One thing is, we’re a restaurant by the river and the ocean, but now we’ve got a lake, and we weren’t planning on that one.”

City officials did not immediately respond to KTLA’s request for comment.

Swimmers and surfers were also advised to stay out of the water for at least the next several days due to the recent rainfall.

Whenever there is a large amount of rainfall, ocean water just off the beach can become dangerous due to increased runoff from storm drain outlets and local rivers. Rain fills the channels and eventually carries the water (and any contaminants along with it) down to local beaches.

Beaches that are close to storm drains and creeks are especially prone to be contaminated with bacteria, debris, trash and “other public health hazards from city streets,” according to the Los Angeles County Public Health Department, which is required to alert the public about possibly dangerous water conditions per statewide guidance.

People exposed to the contaminants can sometimes become ill, Public Health officials warn.

Beachgoers are urged to avoid the water for at least three days after a strong rain event. That means swimmers should avoid the water through at least Tuesday.

For the latest on water quality conditions in Los Angeles County, click here.