Willow Creek is a 9.73 mi (15.66 km) long third-order tributary to the Niobrara River in Rock County, Nebraska.

Willow Creek rises on the North Fork Elkhorn River divide at Willowdale School and then flows northwest and northeast to join the Niobrara River about 0.5 miles (0.80 km) northwest of Mariaville, Nebraska.

[1] Willow Creek drains 21.63 square miles (56.0 km2) of area, receives about 24.2 in/year (61 cm/year) of precipitation, and is about 3.53% forested.

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