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Map Satellite Though primarily a source for water for Napa, there are elements of botanical and zoological interest here.
In the canyon below Conn Dam there is what is most probably a native stand of the California black walnut, Juglans hindsii. This tree in its native habitat is listed as a rare species. It has been naturalized in much of California and is found both under cultivation and wild. Because of its resistance to oak-root rot and drought, most of the commercially grown English walnuts in the State are grafted to Juglans hindsii root stock.
Fluctuations in the water level and frequent bulldozing on the margins of the lake proper have altered or destroyed most of the native vegetation, though in some years there are fair floral displays, including a number of Iris spp.
During the migratory season a number of waterfowl may be found on the lake, including Canada geese, Branta canadensis, and wood duck, Aix sponsa.
Integrity: This is a reservoir managed for drinking water. Below the dam there is a picnic area, with several buildings.
Use: Educational, observational, light recreation.
November 1975
Inventory of California Natural Areas
Revision © 2009 Steven Louis Hartman
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