The May/June 1957 California Highways & Public Works cites the Atwater Freeway as one of several US 99/LRN 4 realignments nearing completion between Sacramento-Los Angeles.
The January/February 1958 California Highways & Public Works discusses the opening of the Atwater Bypass (retitled from Atwater Freeway). The Atwater Bypass is cited as being a 4.5 mile reroute of US 99/LRN 4 through the City of Atwater which opened to traffic on October 14th, 1957.
Part 2; a drive on former US Route 99 in Atwater on Atwater Boulevard
From the current CA 99 Freeway northbound Former US 99/Atwater Boulevard can be accessed via Exit 194.
Former US 99/Atwater Boulevard follows east of the CA 99 Freeway in a generally northwestern direction. Former US 99/Atwater Boulevard has a significant intersection at Winton Way.
Former US 99/Atwater Bouelvard intersects and crosses under the CA 99 Freeway where it terminates near Atwater Canal.