Los Angeles County’s $30 billion proposed budget for the 2017-18 fiscal year unveiled Monday includes $355 million in spending intended to reduce homelessness, nearly $100 million in criminal justice reforms and more than $1 billion in infrastructure spending, including progress on a new downtown jail.

The spending blueprint also includes funding to hire 220 additional social workers to reduce child welfare caseloads, Chief Executive Officer Sachi Hamai told reporters.

“It focuses on progress and people, expands the services to the most vulnerable, accelerates innovation in health care, advances criminal justice reforms and continues to commit to responsible fiscal practices,” she said.

Hamai warned that spending could shift due to uncertainties about funding at state and federal levels.

However, an anticipated $355 million in new revenue from voter-approved Measure H should give the county lots of running room on one of its most important priorities, reducing homelessness.

That money will go to fund 21 strategies to fight homelessness and is projected “to assist 45,000 families and individuals to escape homelessness, while preventing 30,000 others from becoming homeless in the measure’s first five years,” Hamai said.

Those numbers amount to getting 96 percent of those currently homeless into housing, while working to prevent an increase in their numbers.

A new five-year healthcare initiative, dubbed Whole Person Care, will focus on the “sickest, most vulnerable” Medi-Cal patients in the county, which could also include those living on the street. The budget includes $90 million to launch that program.

Mental health is also highlighted, with $3.7 million earmarked for a triage call desk and 19 new positions on mental evaluation teams within the Sheriff’s Department.

Criminal justice reforms include $90 million in spending on jail diversion and re-entry programs for mentally ill individuals and those with substance abuse problems. Hamai said those dollars went unspent last year.

However, the CEO was confident about the county’s ability to put Measure H funds to work and to hire 635 new county employees across various departments in the coming year.

Those new hires would include enough child welfare social workers to bring caseloads down to 19 children per employee, according to Hamai.

The Department of Children and Family Services is also poised to hire 107 support personnel and another 58 positions focused on improving mental health care for children in the system.

In all, the budget reflects an increase of $137 million over last year’s total, though Measure H adds more than 2 1/2 times that amount to county revenues.

Hamai called her department’s economic forecast “cautiously optimistic” in a letter to the Board of Supervisors, which will review the budget proposal Tuesday.

Property taxes are preliminarily estimated to rise roughly 5.8 percent, with statewide sales taxes forecast to increase by 3.5 percent.

At the same time, Gov. Jerry Brown indicated in his proposed budget that the state has and will continue to fall short of forecasted revenues, leading to a $1.7 billion shortfall for the 2017-18 fiscal year.

President Donald Trump is not expected to release his detailed budget proposal until May.

However, his blueprint calls for federal cuts of more than 10 percent to both health and human services and urban development, both of which would eliminate funding for a number of county programs.

Supervisor Kathryn Barger, in a statement later in the day, said she would propose additional strategies to ensure the board acts as “responsible stewards of taxpayer funds.”

Barger previewed a motion asking the CEO to work with county lawyers to evaluate additional safeguards in the budgeting process, including cost offsets for new funding proposals and an increase in the county’s “rainy day” fund.

“The board’s adherence to a conservative budgeting approach has helped the county weather fiscal crises and economic downturns — such as the Great Recession — without layoffs, furloughs, or extensive cuts in service provision,” Barger said.

“Although the county has recently enjoyed several years of economic growth, given the fiscal uncertainty and financial pressures currently facing the county, it is important for the board to evaluate whether there are additional best practices that could further strengthen the county’s financial position.”

Los Angeles County’s budget is larger than that of a majority of states, but roughly 40 percent of it comes from federal and state funding sources.

County departments have been asked to submit budget-reduction proposals in the event that federal and state dollars are cut.

“Although it our hope that budget reductions can be avoided, the county must, and will, be prepared to act, if necessary,” the CEO said in a statement.

Public hearings on the county spending plan are scheduled to begin May 17.