California Department of Transportation

Vernal Pool Research

Vernal Pool Vernal pools are unique and highly threatened wetlands. They are seasonally flooded depressions underlain by a subsurface which limits drainage. Vernal pools support a specialized biota, including a relatively large number of threatened and endangered species. Caltrans is often required to mitigate for the loss of vernal pool habitat. Work done at Travis AFB from 1993 to 1996 indicated that it is possible to construct and inoculate vernal pools so that proper hydrology, plants and invertebrates occur shortly after construction. New work is needed to determine if the vernal pool characteristics persist and expand over the course of time. This information will help determine if artificial vernal pool construction is a usable tool for mitigation. (Definition adapted from Department of Fish and Game)

Vernal Pool Final Reports