
Shadow Cliffs Regional Recreation Area, a regional park on Stanley Blvd on the border of Pleasanton and Livermore that is part of the East Bay Regional Parks system, is a great example of what can happen when government agencies, business and the public work together to do things right.
A former gravel quarry, Shadow Cliffs is now a prime fishing spot to catch rainbow trout, channel catfish and largemouth bass in the Pleasanton area. The land was donated to the East Bay Regional Park District by Kaiser Industries, formerly the operator of the quarry, and opened as a park in 1971.
The U.S. Bureau of Outdoor Recreation provided a grant of $250,000 for development of park facilities. With this funding, the park district developed a 266-acre park that included an 80-acre lake, picnic facilities and large parking lot.
The lake includes a sandy beach with swimming, water slides and supports fishing and recreational boating. It is also a popular picnic area for Pleasanton and East Bay Region families. Now the water slides have been taken down and is now planned to be replaced by an Interpretive Center.
During periods of big storms when other East Bay lakes become muddy and hard to fish, Shadow Cliffs and its East Bay neighbor, Quarry Lakes, remain fishable.
“Shadow Cliffs maintains relatively clear water conditions during and after winter storm events,” said Ed Culver, a fisheries biologist in his latest report on the reservoir covering the period from 2013 to 2017. “For this reason, the rainbow trout catches are often very good when other local reservoirs are turbid and unfishable.”
Fish community surveys are conducted annually at the same sites from June to July. Surveys are conducted at night using an electro-fishing boat. This method utilizes an electrical current sent from the boat through the water, which temporarily stuns the fish for easy collection. Upon collection, fish are identified, measured for length and weight, and released back into the lake.