Measurements of the flow at 250 m below the surface were made with parachute drogues laid out at 5-mile intervals on a line 125 nautical miles in length (true bearing 067°) extending landward from 35° 52.0'N, 124° 28.9'W to the 1000-fathom curve at 36° 36'N off Monterey, California. The drogues were followed for 48 hours. A northward flow, about 40 miles in width, with a maximum flow of 0.44 kt at the center, was seen near the coast.
Reid, Joseph L.. 1962. "Measurements of the California countercurrent at a depth of 250 meters." Journal of Marine Research 20, (2). https://elischolar.library.yale.edu/journal_of_marine_research/980