Roberts Landing

Roberts Landing was a settlement in Alameda County, California, now incorporated into the town of San Leandro. It is located at the mouth of San Lorenzo Creek on San Francisco Bay just west of the community of San Lorenzo. In the 19th century, it had warehouses and a wharf, and was used by farmers to ship their produce to the city of San Francisco. From 1906 to 1964, it was the site of an explosives manufacturing plant operated by the Trojan Powder Company. Following the plant's closure, the site was decontaminated. After protracted discussions, part was made into a housing development while a larger part was made an open space that is now also called the San Leandro Shoreline Marshlands.

When the landing was founded in 1850 it was in the marshlands at the foot of San Lorenzo Creek on a navigable slough leading into San Francisco Bay.
The region had been transferred from the Mission San José to the State of California after the Mexican–American War .
San Lorenzo Creek drains 48 square miles of the Berkeley Hills. It flows west from the hills and enters the east side of San Francisco Bay opposite the city of San Francisco.
In the past it followed an incised channel across the coastal plain and then spread out into marshes along the Bay.
The creek was insignificant in the summer, but in winter could be torrential.
The freshwater marshes fed by the creek merged into more saline tidal marshes nearer the bay.

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