I found this :
SPHERES OF WAR-IN STACKS
PILED up like a show exhibit of gigantic oranges,
hollow iron floats are stacked beside US Highway
101 at Seal Beach, California. In World War II they
were used to suspend anti-submarine nets to protect
US ports. At war’s end the navy hauled them out
of the water, stored them against future contingencies.
Each weighing 680 lb and 5ft in diameter, they stand
in three tidy 45ft mountains, each of 8415 grey floats.
So Seal Beach, assuming this source has it right https://nla.gov.au/nla.obj-484219677














It didn't look to me like the 101 in SoCal in the first place and I'm old enough to remember it in the 60s. But I don't know Seal Beach.