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Canada Geese at the Yolo Bypass Wildlife Area.

The Yolo Bypass Wildlife Area is located within the Yolo Bypass in Yolo County, California. The Wildlife Area is managed by the California Department of Fish and Game with the intent of restoring and managing a variety of wildlife habitats in the Yolo Basin, a natural basin in the north part of the Sacramento-San Joaquin River Delta. The creation of the Wildlife Area was spearheaded by the Yolo Basin Foundation [1]. The California Department of Fish and Game and Yolo Basin Foundation are the core partners in the operation of this unique community resource.



The Wildlife Area was open to the public in 1997 after extensive restoration efforts completed by Ducks Unlimited with federal funds appropriated through the United States Army Corps of Engineers. In 1999, this 3,700-acre (15 km2) restoration project was named the Vic Fazio Yolo Wildlife Area in honor of congressman Vic Fazio who lobbied hard for the funds needed to build the project. In 2001 the Wildlife Area expanded to over 16,000 acres (65 km2) with the acquisition of the Glide and Los Rios properties. These acquisitions included the 10,000-acre (40 km2) Tule Ranch, a working cattle ranch with extensive vernal pool areas.

The Entrance to the Wildlife Area during a major flood.

Flood Control

The Yolo Bypass is a 59,000-acre (240 km2) flood control channel that protects Sacramento and other cities from flooding. The Wildlife Area was created with the understanding that it would remain completely compatible with this primary flood control function. For this reason, there are restrictions on the density of emergent vegetation and riparian trees within the Wildlife Area. These standards are determined through the use of hydrological models.

Located at the north end of the Yolo Basin where Putah Creek enters the Yolo Bypass, this part of the Delta is known as the Putah Sinks and hosts a diverse assemblage of wildlife species inhabiting seasonal wetlands, permanent wetlands, riparian forest, uplands, vernal pools and agricultural habitats.

White-fronted geese rising into a November sunrise.

Seasonal Wetlands

Most wetland on the Wildlife Area are managed as seasonal wetlands. They go through an extensive dry period during the spring and summer months. Typically these ponds are drained April 1 to stimulate the germination of Swamp Timothy. They may receive a brief summer irrigation and then are flooded in September to provide wetland habitat for migratory waterfowl and shorebirds.

Permanent Wetlands

The Threatened Giant Garter Snake is found in aquatic habitats in much of the Wildlife Area.

Permanent wetlands are flooded year round and tend to be deeper and have more emergent vegetation. These ponds provide important brood water for resident aquatic birds such as mallards, common moorhens and pied-billed grebes. They also provide drinking water for wildlife as well as relief from intense summer heat. This habitat is used extensively for roosting by black-crowned night herons, egrets, and white-faced ibis. The Giant Garter Snake also occurs in this habitat.


Upland habitats are used extensively by ground nesting birds such northern harriers, western meadowlarks, mallards and ring-necked pheasant. Vegetation is typically dominated by annual rye grass, curly dock and wild sunflower. Rodent populations in these areas provide prey for large numbers of wintering birds of prey.

Riparian Forest

Extensive fields of wildflowers occur in the spring on the Tule Ranch.

Riparian vegetation consists of willows, cottonwoods, black walnut and other tree species. Nesting species include Swainson's hawks, great-horned owls, wood ducks, tree swallows, and black phoebe. This habitat is very important for neo-tropical migrants such as blue grosbeak, ash-throated flycatchers, and a variety of warbler species. Most riparian vegetation is located along Putah Creek in the central part of the Wildlife Area.

Vernal Pools

Approximately 1,800 acres (7.3 km2) of natural uplands occur in the southwest portion of the Wildlife Area. There are several vernal pools in this area that are home to such invertebrate species as tadpole shrimp, clam shrimp and the endangered Conservancy fairy shrimp. Rare and endangered plants include Heckert's pepperweed and Ferris' alkali milk vetch. Grassland bird species in this area include grasshopper sparrow, savannah sparrow and burrowing owl.

Agriculture is an integral part of the management of the Wildlife Area.


Snow geese descend upon irrigated pasture on the Tule Ranch

An interesting feature of the Wildlife Area is the extensive use of agriculture to achieve its wildlife habitat goals, while providing important operating income. Cattle are used to control unwanted vegetation and are the primary management tool in the vernal pool habitat area. Their removal of thatch from the thick stands of annual rye grass help facilitate the germination of native forbs in this area, resulting in spectacular blooms of wildflowers each spring. In the northern portions of the Wildlife Area, rice is grown, which is then flooded after harvest, attracting thousands of waterfowl and shorebirds in full view of the thousands of automobiles on Interstate 80. Wildlife Managers have instituted a unique rotation within the rice fields that allows for a fallow stage every three years. During this fallow stage, the field is managed for migratory shorebirds by flooding during the mid summer months.

Public Use

Kids learn about wetlands in the "Discover the Flyway" program.

The Wildlife Area is open every day (except Christmas) for wildlife viewing and fishing. There are monthly tours on the second Saturday of each month conducted by volunteers from the Yolo Basin Foundation. Other public use opportunities are provided by the Yolo Basin Foundation and Fish and Game including bat tours, open houses and a fall/winter speaker series.

Hunting for waterfowl, pheasant and mourning dove is conducted in specific area by the California Department of Fish and Game during the fall and winter months.

The "Discover the Flyway" environmental education program annually brings approximately 4,000 students per year to learn about wetlands and visit the Wildlife Area.


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