A search of the
Los Angeles Times on "streets flooded" in the 1950s yields (order as found in the articles):
1/25/1952: Streets flooded: Jefferson at Centinela, Sepulveda at Centinela, Roscoe Blvd. between Reseda Blvd and Vanalden Avenue, Sunset at Sunset Plaza.
12/21/52: Streets in the heart of Downey, Tyrone Avenue at Victory in Van Nuys.
1/13/57: Nordhoff near Woodbury in Van Nuys, area of Slauson and Sepulveda, and Overland and Venice.
3/1/57: 14th and Pine, and Flourney and Valley Drive, in Manhattan Beach,
2/20/58: Flower between 5th and 6th, numerous places in El Segundo, Manhattan Beach, Bellflower, Hermosa Beach, Hawthorne, Redondo Beach, Torrance, Lynwood, Downey, Gardena, Inglewood; Wilshire evidently in an area served by drains at 6th and Alexandria, Mariposa from Wilshire to 6th. In San Pedro, Gaffey at Cabinet Dr. and from Battery to Channel St. Flooding in the area of Eastern and Slauson, area of Manchester and 92nd; Atlantic from Olympic to Washington; Beverly Glen from Valley Vista to Mulholland; areas in La Puente; Arlington from 36th to 39th; Exposition from Gramercy Pl. to 11th Avenue; 7th and Anderson; 3rd and Catalina; Crenshaw between Exposition and Santa Barbara; Airport from Flight to 74th. N. Orange Dr. in West Covina; 6th and Figueroa; 7th and Grand.
2/9/59: Aviation Blvd, in El Segundo between El Segundo and Rosecrans;14th and Pine in Manhattan Beach; Slauson at the 101; Slauson at Sepulveda.