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The road then interchanges with State Route 156 and traverses northeast as the western boundary of Castroville before meeting its northern terminus, State Route 1, the Cabrillo Highway.
The nexus of Serramonte is Serramonte Center, originally opened in 1968, near the intersection of State Route 1 and Interstate 280, in the triangle formed by Callan Boulevard, Serramonte Boulevard, and Junipero Serra Boulevard which originally opened in 1968.
When the original state highway system was created in 1921, it was designated as part of State Route 1, which followed the Jefferson Highway auto trail.
The route of LA 3261 once carried a small piece of the Jefferson Highway (State Route 1 in the pre-1955 Louisiana highway system) and U.S. 61 until 1928-1929 when Jefferson Highway was extended along the Orleans-Kenner interurban streetcar right-of-way from Shrewsbury Road to the Protection Levee at South Claiborne Avenue.
In its original form, the route of LA 611-3 included what was once a small piece of the Jefferson Highway (State Route 1 in the pre-1955 Louisiana highway system) and U.S. 61 prior to the direct extension of Jefferson Highway into South Claiborne Avenue in 1928.