Cull Canyon Regional Recreation Area

Cull Canyon Regional Recreation Area (CCRRA) is a regional park located in Castro Valley, Alameda County, California. It is part of the East Bay Regional Park District (EBRPD) system.[1]

Cull Canyon Regional Recreation Area

Lifeguards training in the lagoon
Type Recreational area
Location Alameda County, California
Nearest city Hayward, California
Area 360 acres (1.5 km2)
Operated by East Bay Regional Park District
Open Easter until Labor Day (swim area)
Status Open

. . . Cull Canyon Regional Recreation Area . . .

CCRRA includes a 1.5 acres (0.0061 km2) swim lagoon and formerly included a fishing lake that resulted from damming San Lorenzo Creek.[lower-alpha 1] The swim area has a bathhouse, lawns, sandy beaches, and much shallow water for kids.[2] EBRPD reports that “The [recreation area’s] lagoon won the 1966 Governor’s Design Award for Exceptional Distinction for Recreational Development in the category of landscape.”[1][3] The recreation area is open for swimming seasonally. The swim area is fenced and has a lifeguard on duty when the area is open. No dogs are allowed inside this area.

In 2014, the San Jose Mercury-News, a local newspaper, reported that the Cull Creek Reservoir Dam would likely be drained soon because it had been judged as seismically unsafe. This hazard was caused by tons of sediment that had deposited since the dam was constructed in 1963.[4]{{efn|The report should not have surprised anybody in authority. According to a 2007 article in the East Bay Times, the reservoir was originally 30 feet (9.1 m) deep, and designed to hold 101,000,000 US gallons (380,000 m3) of water. By 2007, it could hold less than one-fifth of that quantity, even though a dredging operation in 2002-2003 had removed 290,000 cubic yards of sediment, which nearly restored the original capacity. The article reported that the state Division of Safety of Dams had set a deadline of July 1 for Alameda County to submit a report on progress making improvements.[5]

By 2014, the water layer was estimated to be only 6 feet (1.8 m) deep.[4] The Alameda County Flood Control Manager, Hank Ackerman, said that the reservoir receives 12,000 to 20,000 cubic yards of silt and debris every year, which is trapped behind the dam. He added that the problem had reached a point where it caused a massive fish kill in August 2013, and that EBRPD had ceased to restock the reservoir with fish.[4]

A temporary solution to the seismic concern was obtained in 2006 when engineers penetrated the concrete spillway with 12-inch pipe that relieved pressure on the dam by lowering the water level in the lake. Ackerman noted that dredging the lake to remove the sediment had been estimated to cost $16 million and require 28,000 round trips with double bottom dump semitrailers to remove the estimated 450,000 cubic yards of sediment. The dam would need to be reinforced after the silt is removed.[4]

Almeda County engineers have proposed to notch the reservoir’s weir. This would let water flow downstream,leaving the accumulated sediment behind. Ackerman said that cost would be less than $1 million, and that the seismic threat would be eliminated because the (California) Division of Safety of Dams would no longer consider it a dam if it didn’t hold back water.”[4]

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