Sweetwater Wetlands

Sweetwater Wetlands is a true oasis in the heart of Tucson and the Sonoran Desert nestled along the Santa Cruz River. It is managed by Tucson Water as a water recharge facility but also as a refuge for both wildlife and human visitors.

Sweetwater Wetlands was built in 1996 to clean effluent from Pima County’s treatment facility before returning it to the aquifer. When the Agua Nueva water reclamation facility opened in 2013, the wetlands were no longer needed for this purpose. Recognizing the wetlands’ value to wildlife and the community, Tucson Water has continued to manage and protect this urban oasis. Now, over a mile of trails surrounding seven ponds allows you to view birds and other wildlife and enjoy a peaceful natural outing in urban Tucson.

The presence of water in the desert isn’t the only reason why Sweetwater is so special. It’s also the dense, native riparian vegetation such as mature Goodding willow and Fremont cottonwood, cattail marsh, and upland arid plants like saltbush and velvet mesquite that provide a variety of niches for different birds. Over 330 bird species (see the eBird hotspot) have been recorded at Sweetwater Wetlands as well as many species of mammals and reptiles.

Year round, resident birds at the wetlands include Gambel’s Quail, Common Gallinule, Green Heron, Cooper’s Hawk, Vermilion Flycatcher, and Abert’s Towhee. Bell’s Vireo, Northern Yellow Warbler, and Lucy’s Warbler are abundant summer breeders and rarer species like Least Bittern and Tropical Kingbird nest some years too. In the winter, huge flocks of waterfowl utilize the wetlands consisting mostly of American Wigeon and Northern Shoveler. Large blackbird flocks roost among the cattails in winter, with waves of Red-winged and Brewer’s Blackbirds and Great-tailed Grackles coming in at sunset along with less common Yellow-headed Blackbirds and Bronzed Cowbirds. During migration, the wetlands can have a migrant trap effect, bringing in many rare and unusual species over the years such as Purple Gallinule and Eastern Kingbird. Rare warblers like Northern Parula, Black-and-white Warbler, and Chestnut-sided Warbler often show up in fall and may overwinter. 

Commonly seen mammals at the wetlands include the famous bobcats, coyote, raccoon, desert cottontail, and Arizona cotton rat. The most frequently seen cold blooded creatures are introduced and invasive red-eared sliders and American bullfrogs, but native reptiles often seen include Western diamondback rattlesnake, desert kingsnake, desert spiny lizard, and Sonoran spotted whiptail. Insect life is abundant here too with the diversity and density of dragonflies being at its highest during the summer monsoons when species like the hot pink roseate skimmers are conspicuous.

Sweetwater Wetlands Wednesday Bird Walks

Tucson Bird Alliance leads guided bird walks at the wetlands every Wednesday morning year round. Start times vary depending on the time of the year; check our field trips page for more information and to register. Twice a month educational workshops are led on weekends—sign up is also on our field trip page.

• Every Wednesday
• Trip Rating: Easy, groomed trail and paved sidewalk for a short stretch at the start
• Trip Duration: 2–2.5 hours; 1.3 miles for complete loop
• Drinking water, restrooms, and benches available
• See the Field Trip list to find the next walk and sign up