SAN DIEGO -- The San Diego County Board of Supervisors Tuesday unanimously approved a $4.9 billion budget for the 2009-10 fiscal year, cutting spending by 4.7 percent because of economic uncertainty.

The spending plan is by no means set in stone, despite Tuesday's vote.

Several supervisors expressed concern that the state government will continue to reduce funding to local governments, which could cost the county tens of millions of dollars.

"Sixty percent of what we do is (operating) state programs with state funding," said board Chair Dianne Jacob. "We will most likely have to revisit this budget depending on what happens in Sacramento."

The 2009-10 budget funds the equivalent of 16,431 full-time jobs, down 758 from the current fiscal year.

The biggest funding bite comes from public safety, which will see a 5.2 percent spending drop from this year, amounting to a $72.8 million reduction.

The county will close the Descanso Detention Facility, and staff reductions will mean fewer services and visits for crime victims, and less intervention for youth at-risk for entering the juvenile justice system.

Spending on capital projects will drop by $300 million, because a large amount of money was spent for the new County Operations Center this year that won't be needed next year. Capital spending fluctuates greatly on a year-over-year basis depending on when construction project costs need to be paid.

Other spending areas will see slight increases. The county Health and Human Services Agency will receive a 2.8 percent boost, or $50.2 million.

Supervisor Greg Cox said harder cuts will come in "the next go-round." That could be from funding reductions enacted by the state Legislature.

If not, the painful cuts will come in the 2010-11 budget, in which county officials plan to reduce spending even further, to about $4.5 billion.

Those areas that weren't cut in the upcoming fiscal year, which begins July 1, are expected to receive major spending reductions in 2010-11, according to the county operational plan.