Ciénega Creek

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Ciénega Creek is a mostly dry stream in southern Arizona. It begins in the Canelo Hills and flows northwest for about 50 miles toward Tucson, where it becomes Pantano Wash and eventually leads to the Rillito River. Some sections keep water year-round thanks to groundwater rising along bedrock barriers in the valley.

This area is one of the state’s best-preserved riparian habitats. It features cottonwood-willow forests and mesquite woodlands that support many birds and other wildlife. Species found here include the endangered Chiricahua leopard frog in the upper stretches, the Mexican garter snake, checkered garter snake, Madrean alligator lizard, giant spotted whiptail lizard, toads, and birds such as the southwestern willow flycatcher, yellow-billed cuckoo, and Bell’s vireo. The creek still has native fish and other wildlife and is not heavily invaded by non-native species.

Conservation work protects the area’s unique life. Las Cienegas National Conservation Area guards the upper Ciénega basin and its wildlife, including endangered fish like the Gila topminnow, Gila chub, and longfin dace. The NCA covers about 45,000 acres and includes the historic Empire Ranch near Sonoita.

The Ciénega Creek Natural Preserve, established in 1986, protects about 12 miles of the creek across 4,000 acres, with roughly half of its length flowing year-round. It contains historic sites such as Pantano and the Ciénega Bridge (built 1920–1921).

In Tucson, Pantano Wash is part of Pantano River Park, which has a paved path, restrooms, water fountains, and picnic areas. A nearby Commemorative Tree Park has planted more than 100 desert trees since 2012, with a goal of reaching 570 trees to help shade the area, reduce floods and erosion, and store carbon.