Oak Creek is a 7.41 mi (11.93 km) long third-order tributary to the Niobrara River in Rock County, Nebraska.

Oak Creek rises on the North Fork Elkhorn River divide about 0.25 miles (0.40 km) north of Plainview School and then flows northwest and northeast to join the Niobrara River about 1.5 miles (2.4 km) west of Mariaville, Nebraska.

[1] Oak Creek drains 14.86 square miles (38.5 km2) of area, receives about 24.2 in/year (61 cm/year) of precipitation, and is about 9.33% forested.

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