Noonday Creek is a 20.2-mile-long (32.5 km)stream in Cobb and Cherokee counties in the U.S. state of Georgia. The stream begins near Kennesaw Mountain and ends at Lake Allatoona.
Noonday is a translation of the native Cherokee language name, referring to the solar noon.
Noonday Creek is a tributary of the Little River, joining it within Lake Allatoona just to the north of the Towne Lake development. The confluence of Little River and Noonday Creek now lies beneath the water of the lake.
At the northern end of Cobb County, Noonday Creek picks up outflow from the Noonday Water Reclamation Facility, a sewage treatment plant serving Cobb and Cherokee counties. A large sewer line is buried along most of the creek south (upstream) of the plant, seen as a treeless kudzu-covered flood plain, dotted with concrete mounds topped with manholes.
Little Noonday Creek is its only officially-named tributary, flowing north from the northeast corner of Marietta and then northwestward, joining the main creek southwest of Noonday, at Noonday Creek Park. An unnamed tributary through Lake Latimer extends from the southwest along I-575 to the north end of the park. During heavy rains, the main creek often floods the fields at the park, and increasingly so due to excessive runoff from heavy land development in the area.