Walnut Creek is a 23-mile (37 km) long tributary stream of the Colorado River in TexasIt flows from north to south, crossing the Edwards Plateau on the western side of Austin, down to the Blackland Prairie on the eastern side of the city where it then drains into the Colorado River downstream of Longhorn DamThe stream's upper region flows over limestone, while the southern stretch passes through deeper clay soils and hardwood forest. Walnut Creek's watershed, spanning 36,000 acres (15,000 ha), is the largest in Central Austin.

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Walnut Creek