The zoo says it's working with the city to resolve an issue with the water-pressure system at the new Landing Café.
The only way to get to the restaurant is by gondola ride.
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The city is due to inspect and test the water pressure on Thursday, which is the earliest the gondola could open.
Our media partner, The Mercury News, says the eight-person electric gondolas will take passengers to the visitor center and a new floor-to-ceiling glass-walled restaurant, which has views of San Francisco Bay.
It's part of the first phase of the zoo's $70 million California Trail expansion that will double the size of the complex to about 100 acres. It is scheduled to open next summer.