The Buena Vista Lagoon Ecological Reserve in San Diego County sits between the cities of Oceanside to the north and Carlsbad to the south. It’s historic because it was the state’s first-ever reserve, created in 1968. … [H]omeowners in that area, the San Diego Association of Governments (SANDAG), CDFW and several other groups came to an agreement after years of dispute on how the lagoon should be altered so it thrives well into the future. … Like lagoons up and down that part of San Diego County, Buena Vista took in runoff from hills to the east and fed water to the west into the Pacific Ocean. But in the ‘40’s a weir was added at the mouth by nearby landowners, so the lagoon essentially became freshwater only. …