After opening for a week, beaches near border closed again Copyright 2017 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed. Stock photo A sign warns swimmers not to enter the water after sewage-contaminated water entered Imperial Beach's coastline. and last updated 2021-07-26 02:10:45-04 SAN DIEGO (CNS) - After being open for only one week, the ocean shoreline near the border was closed again Sunday because of sewage contamination, San Diego County officials said. The closure affects all of the ocean shoreline at Tijuana Slough National Wildlife Refuge and Border Field State Park, officials said Sunday.