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Issued: 02/12/2026
Performance Audit
We audited the California Department of Transportation’s administration of its statewide Airspace Program. This report is the second in a series of reports regarding the department’s administration of properties it controls, known as airspaces, located underneath state highways.
Issued: 01/21/2026
Project Compliance Audit
On behalf of the Independent Office of Audits and Investigations (IOAI), the California Department of Finance, Office of State Audits and Evaluations (Finance) completed its project compliance audit of the City and County of San Francisco (County). Finance audited the costs that the County incurred, and the California Department of Transportation reimbursed, related to the County’s Third Street Bridge Rehabilitation Project, totaling $31,400,500. Finance also audited the project deliverables and outputs, and the County’s fiscal year 2019-20 Indirect Cost Rate Proposal.
Issued: 12/18/2025
Project Compliance Audit
We audited the costs that the City of Modesto incurred related to two projects totaling $91,472,748, which were reimbursed by the California Department of Transportation. We also audited the project deliverables and benefits.
Issued: 11/21/2025
Project Compliance Audit
We audited the costs that the California Department of Transportation, District 8 incurred related to the San Bernardino/Riverside State Route 62 Mill and Overlay project totaling $38,243,478. We also audited the project deliverables and benefits.
Issued: 6/26/2025
Project Compliance Audit
We audited the costs that the California Department of Transportation, District 10 incurred related to the State Route 99 Stanislaus Capital Preventive Maintenance Ramps project totaling $29,344,063. We also audited the project deliverables and benefits.
Issued: 6/4/2025
Project Compliance Audit
At the request of the California State Transportation Agency, we completed a review of the California Department of Transportation’s compliance and oversight activities related to federal infrastructure funding, specifically the Infrastructure Investment and Jobs Act. The review fulfills the requirements of the 2022 Budget Act (Senate Bill 198, Chapter 71, Statutes of 2022).
Issued: 5/13/2025
Project Compliance Audit
We audited the costs that the City of Artesia incurred related to one project totaling $1,738,472, which were reimbursed by the California Department of Transportation. We also audited the project deliverables and benefits.
Issued: 5/1/2025
Project Compliance Audit
On behalf of the Independent Office of Audits and Investigations, the California Department of Finance, Office of State Audits and Evaluations (Finance) completed its audit of the City of Bakersfield (City). Finance audited the costs that the City incurred related to four project phases of the City’s multiphase Centennial Corridor Project totaling $136,736,845, which were reimbursed by the California Department of Transportation. Finance also audited the project deliverables and benefits.
Issued: 4/29/2025
Project Compliance Audit
We audited the costs that the County of Sacramento incurred related to three projects totaling $16,508,152, which were reimbursed by the California Department of Transportation. We also audited the project deliverables and benefits.
Issued: 4/8/2025
Project Compliance Audit
We audited two San Diego Metropolitan Transit System projects, one for reimbursed costs in the amount of $34,143,138 and the other project for deliverables and benefits.
Issued: 3/14/2025
Project Compliance Audit
We audited the costs that Stanislaus County incurred related to four projects totaling $65,579,833, which were reimbursed by the California Department of Transportation. We also audited the project deliverables and benefits.
Issued: 1/15/2025
Project Compliance Audit
We audited the Los Angeles County Metropolitan Transportation Authority’s costs related to one project totaling $14,808,000, which was reimbursed by the California Department of Transportation. We audited project deliverables for two projects.
Issued: 11/8/2024
Project Compliance Audit
We audited the costs that the California Department of Transportation, District 7 incurred related to the Interstate 5 North High Occupancy Vehicle Corridor project totaling $916,110,612.
Issued: 7/11/2024
Project Compliance Audit
We audited the costs incurred by the California Department of Transportation, District 4, related to the "I-880 Pavement Rehabilitation" project totaling $68,812,233.
Issued: 5/30/2024
Performance Audit
Pursuant to Government Code, section 14461, and at the request of the director of Caltrans, the Independent Office of Audits and Investigations completed its audit of the California Department of Transportation’s (Caltrans’) administration of the airspace property, located at and around 14th and Lawrence streets, in Los Angeles, California. This report represents the first report, in a series of reports, that we anticipate releasing related to Caltrans’ administration of the airspace program.
Issued: 4/12/2024
Performance Audit
Pursuant to Public Contract Code, Section 10351(a)(4), the Independent Office of Audits and Investigations completed its audit of Caltrans’ contract delegation. The Department of General Services exempts contracts under $150,000 from its approval under the condition that Caltrans meet the biennial audit requirement. This audit is the first of the two required audits.
Issued: 3/28/2024
Performance Audit
Pursuant to Government Code, Section 14461, the Independent Office of Audits and Investigations completed its audit of the litter abatement efforts within the Clean California Program.
Issued: 3/25/2024
Project Compliance Audit
On behalf of the Independent Office of Audits and Investigations, the California Department of Finance, Office of State Audits and Evaluations (Finance) completed its audit of the Peninsula Corridor Joint Powers Board (JPB). Finance audited the costs that JPB incurred related to three projects, of which the California Department of Transportation reimbursed JPB a total of $105,924,553.
Issued: 2/16/2024
Project Compliance Audit
We audited the costs that the County incurred related to three projects totaling $2,398,255, which were reimbursed by the California Department of Transportation.
Issued: 12/29/2023
Project Compliance Audit
On behalf of the Independent Office of Audits and Investigations, the California Department of Finance, Office of State Audits and Evaluations (Finance) completed its audit of Riverside County Transportation Commission (RCTC). Finance audited the costs that the RCTC incurred related to three projects, of which the California Department of Transportation reimbursed the RCTC a total of $292,940,143.
Issued: 12/15/2023
Project Compliance Audit
We audited the costs that the California Department of Transportation, District 11 incurred related to “Siempre Viva Road Interchange” project totaling $26,944,803.
Issued: 11/27/2023
Project Compliance Audit
On behalf of the Independent Office of Audits and Investigations, the California Department of Finance, Office of State Audits and Evaluations (Finance) completed its audit of the Town of Apple Valley (Town). Finance audited the costs that the Town incurred related to three projects, of which the California Department of Transportation reimbursed the Town a total of $10,042,416.
Issued: 9/29/2023
Project Compliance Audit
We audited the San Joaquin Regional Rail Commission’s incurred costs related to three projects totaling $94,674,899, which were reimbursed by the California Department of Transportation.
Issued: 6/30/2023
Project Compliance Audit
We audited the costs that the City of Sanger incurred related to two projects totaling $2.86 million, which were reimbursed by the California Department of Transportation.
Issued: 6/22/2023
Project Compliance Audit
We audited the costs that the County of Monterey incurred costs related to one project totaling $8,684,844, which were reimbursed by the California Department of Transportation.
Issued: 5/30/2023
Project Compliance Audit
We audited the costs that the Santa Clara Valley Transportation Authority incurred related to one project totaling $16.8 million, which were reimbursed by the California Department of Transportation.
Issued: 4/26/2023
Other Report
Pursuant to Government Code, Section 14110.1, the Independent Office of Audits and Investigations has completed its review of the California Department of Transportation’s (Caltrans) small and disadvantaged business enterprise outreach plan, activities, and related reporting requirements. Government Code, Section 14110.1, directs the Inspector General to review, audit, and report on Caltrans’ outreach efforts required by this section.
Issued: 3/1/2023
Other Report
On behalf of the Independent Office of Audits and Investigations, the Department of Finance, Office of State Audits and Evaluations, completed its audit of the County of Yolo, Public Works Division’s Indirect Cost Rate Proposal (ICRP) for fiscal year 2020-21. The audit was performed to determine whether the ICRP complied with Title 2 Code of Federal Regulations Part 200 (2 CFR 200) and the Local Assistance Procedures Manual, Chapter 5.
Issued: 2/17/2023
Project Compliance Audit
We audited the costs that the City of Turlock incurred related to two projects totaling $6,649,714, which were reimbursed by the California Department of Transportation.
Issued: 2/8/2023
Project Compliance Audit
The Office of Inspector General, Independent Office of Audits and Investigations completed an audit of the County of Orange, Public Works. We audited the costs it incurred related to four projects totaling $2,689,033, which were reimbursed by the California Department of Transportation.
Project Compliance Audit
Issued: 12/27/2022
Performance Audit
Pursuant to Public Contract Code, Section 10351(a)(4), the Independent Office of Audits and Investigations completed its audit of Caltrans’ contract delegation. The Department of General Services exempts contracts under $150,000 from its approval under the condition that Caltrans meet the biennial audit requirement. This audit is the first of the two required audits.
Issued: 12/6/2022
Project Compliance Audit
The Independent Office of Audits and Investigations has completed its audit of the San Joaquin Council of Governments (SJCOG). We audited project number 1000000229 - State Route 4 Crosstown Freeway Ramp Extension to determine if SJCOG met the dollar-for-dollar matching requirement.
Issued: 11/21/2022
Other Report
On behalf of the Independent Office of Audits and Investigations, the Department of Finance, Office of State Audits and Evaluations, completed its audit of the County of Santa Cruz’s Indirect Cost Rate Proposal for fiscal year 2021-22.
Issued: 11/7/2022
Performance Audit
Pursuant to Government Code, Section 14461, the Independent Office of Audits and Investigations has completed its audit of the Sacramento-San Joaquin River Delta ferries.
Issued: 10/21/2022
Other Report
On behalf of the Independent Office of Audits and Investigations, the Department of Finance, Office of State Audits and Evaluations, completed its audit of the City of Santa Barbara’s Indirect Cost Rate Proposal for fiscal year 2021-22.
Issued: 10/6/2022
Performance Audit
The Independent Office of Audits and Investigations has completed its audit of the California Department of Transportation performance outcomes for the transportation management system. Senate Bill 1 (Beall, Chapter 5, Statutes of 2017) requires 90 percent of TMS units to be in good condition by 2027.
Issued: 9/23/2022
Other Report
The Independent Office of Audits and Investigations has completed its audit of the Tulare County, Resource Management Agency’s fiscal years 2019-20 and 2020-21 Indirect Cost Rate Proposals.
Issued: 9/16/2022
Project Compliance Audit
The Independent Office of Audits and Investigations completed its audit of the City of Claremont, including the costs that were incurred by the City related to two projects totaling $5,218,696 and that were reimbursed by the California Department of Transportation.
Issued: 8/3/2022
Project Compliance Audit
On behalf of the Independent Office of Audits and Investigations, the Department of Finance, Office of State Audits and Evaluations, completed an audit of three California Department of Transportation, District 11, Proposition 1B funded projects.
Issued: 7/13/2022
Project Compliance Audit
On behalf of the Independent Office of Audits and Investigations, the Department of Finance, Office of State Audits and Evaluations, completed an audit of four California Department of Transportation, District 10, Proposition 1B funded projects.
Issued: 6/30/2022
Project Compliance Audit
The Independent Office of Audits and Investigations completed an audit of the County of Placer (County). We audited the County's costs incurred related to six projects totaling $28,439,047, which were reimbursed by the California Department of Transportation.
Issued: 6/30/2022
Project Compliance Audit
The Independent Office of Audits and Investigations completed an audit of the City of Sacramento, Department of Public Works (City). We audited the City's costs incurred related to three projects totaling $10,805,031, which were reimbursed by the California Department of Transportation.
Issued: 6/14/2022
Performance Audit
The Independent Office of Audits and Investigations has completed an audit of the California Department of Transportation's (Caltrans) SB 1 2019-20 Efficiencies Measures Report. The Road Repair and Accountability Act of 2017 requires Caltrans to, among other things, implement efficiency measures with the goal of generating at least $100 million per year in savings to invest in the maintenance and rehabilitation of the state highway system.
Issued: 5/26/2022
Other Report
On behalf of the Independent Office of Audits and Investigations, the Department of Finance, Office of State Audits and Evaluations, completed an audit of the County of Riverside, Department of Transportation’s (County) Indirect Cost Rate Proposals (ICRPs) for fiscal years 2020-21 and 2021-22. Enclosed is the final audit report, which includes the County’s response.
Issued: 5/20/2022
Other Report
On behalf of the Independent Office of Audits and Investigations, the Department of Finance, Office of State Audits and Evaluations, completed an audit of the City of Bakersfield’s Indirect Cost Rate Proposals for fiscal years 2020-21 and 2021-22.
Issued: 2/24/2022
Other Report
The Department of Finance, Office of State Audits and Evaluations, completed an audit of the Association of Monterey Bay Area Governments’ Indirect Cost Allocation Plans for fiscal years 2019-20 and 2020-21.
Issued: 2/24/2022
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations, completed a Proposition 1B audit of the California Department of Transportation District 6.
Issued: 2/18/2022
Other Report
The Department of Finance, Office of State Audits and Evaluations completed an Indirect Cost Allocation Plan audit of the Transportation Agency of Monterey County’s ICAPs for 2020-21 and 2021-22
Issued: 1/31/2022
Performance Audit
The IOAI completed an audit of the California Department of Transportation (Caltrans) bridges performance measures and targets. Senate Bill 1 (Beall, Chapter 5, Statutes of 2017) requires Caltrans to fix not less than an additional 500 bridges over a 10-year period ending in 2027.
Issued: 1/6/2022
Project Compliance Audit
Enclosed is the Independent Office of Audits and Investigations’ final audit report of the City of Woodland’s four projects totaling $16,071,177 reimbursed by the California Department of Transportation.
Issued: 12/15/2021
Other Report
The Department of Finance, Office of State Audits and Evaluations completed an Indirect Cost Rate Proposal (ICRP) audit of the City of Chico, Department of Public Works’ ICRPs for 2019-20 and 2020‑21.
Issued: 12/6/2021
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations completed a Proposition 1B audit of the Port of Long Beach. The audit was for project 0017000229, Middle Harbor Terminal Redevelopment Project Phase 2 with costs totaling $15.44 million reimbursed by the California Department of Transportation.
Issued: 9/17/2021
Project Compliance Audit
The audit was to determine whether Proposition 1B expenditures were incurred in compliance with the executed project agreements and Caltrans and California Transportation Commission program guidelines.
Issued: 8/13/2021
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations performed a Proposition 1B audit of Orange County Transportation Authority.
Issued: 8/12/2021
Project Compliance Audit
The Independent Office of Audits and Investigations performed an incurred cost audit of the County of Kern’s three projects with costs totaling $3,193,988 reimbursed by the California Department of Transportation.
Issued: 7/16/2021
Performance Audit
The IOAI completed an audit of the Caltrans Construction Zone Enhanced Enforcement Program (COZEEP) and Maintenance Zone Enhanced Enforcement Program (MAZEEP). The purpose of this audit was to determine if COZEEP and MAZEEP had adequate internal controls over the administration of the contracts with the California Highway Patrol (CHP), identify any weaknesses in the process, and make recommendations for improvement. The audit did not include a review of the CHP process over COZEEP and MAZEEP programs.
Issued: 6/11/2021
Project Compliance Audit
The audit was to determine whether Proposition 1B expenditures were incurred in compliance with the executed project agreements, Caltrans and California Transportation Commission's program guidelines, and applicable state and federal regulations.
Issued: 6/4/2021
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations performed a Proposition 1B audit of the City of San Marcos.
Issued: 5/3/2021
Performance Audit
The IOAI completed an audit of the Caltrans Culvert Inspection Program. The Road Repair and Accountability Act of 2017, otherwise known as Senate Bill 1 (SB 1), was signed into law on April 28, 2017. One of the performance outcome requirements of SB 1 is that 90 percent of culverts must be in good or fair condition by the end of 2027. The audit included an evaluation of the actions taken to establish an accurate and complete inventory and baseline condition of culverts, a re-inspection program, and a monitoring process to measure progress in meeting SB 1 performance outcomes.
Issued: 4/16/2021
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations performed a Proposition 1B audit of the San Diego Association of Governments.
Issued: 2/8/2021
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations performed a Proposition 1B audit of the San Francisco County Transportation Authority.
Issued: 2/2/2021
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations performed a Proposition 1B audit of California Department of Transportation, District 1.
Issued: 12/21/2020
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations, performed a Proposition 1B audit of the City of Oxnard of one project with costs totaling $1,436,390 reimbursed by the California Department of Transportation.
Issued: 12/18/2020
Project Compliance Audit
The Department of Finance, Office of State Audits and Evaluations performed a Proposition 1B audit of the County of Merced of one project with costs totaling $41,200,624 reimbursed by the California Department of Transportation.
Issued: 12/17/2020
Project Compliance Audit
The Independent Office of Audits and Investigations performed an incurred cost audit of the County of Alameda of five projects with costs totaling $4,921,300 reimbursed by the California Department of Transportation.
Issued: 11/23/2020
Project Compliance Audit
The Independent Office of Audits and Investigations performed an incurred cost audit of the City of Santa Ana of five projects with costs totaling $2,632,460 reimbursed by the California Department of Transportation.
Issued: 11/10/2020
Project Compliance Audit
The Independent Office of Audits and Investigations performed an incurred cost audit of the City of Montebello of three projects with costs totaling $1,122,317 reimbursed by the California Department of Transportation.
Issued: 10/13/2020
Project Compliance Audit
The Independent Office of Audits and Investigations performed an interim incurred cost audit of the City of Perris of five projects with costs totaling $2,686,244 reimbursed by the California Department of Transportation.
Issued: 7/29/2020
Project Compliance Audit
The California Department of Finance, Office of Audits and Evaluations completed an audit of the City of Salinas Proposition 1B funded projects.
Issued: 6/10/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the City of Dinuba Proposition 1B funded project.
Issued: 6/10/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the City of Fullerton Proposition 1B funded projects
Issued: 5/28/2020
Performance Audit
Issued: 5/22/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the City of Fairfield Proposition 1B funded projects.
Issued: 5/18/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the City of Los Angeles Proposition 1B funded projects.
Issued: 4/20/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations, the Department of Finance, Office of Audits and Evaluations completed an audit of the San Bernardino County Transportation Authority Proposition 1B funded projects.
Issued: 3/30/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the Contra Costa Transportation Authority Proposition 1B funded projects.
Issued: 2/28/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the Alameda-Contra Costa Transit District Proposition 1B funded project.
Issued: 2/28/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the Port of Los Angeles Proposition 1B funded projects.
Issued: 2/13/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the County of El Dorado’s Proposition 1B funded projects.
Issued: 1/13/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the Los Angeles County Metropolitan Transportation Authority’s Proposition 1B funded projects.
Issued: 1/13/2020
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the City of Ontario’s Proposition 1 B funded projects.
Issued: 12/2/2019
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the Port of Stockton’s Proposition 1 B funded projects.
Issued: 10/28/2019
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the Town of Apple Valley’s Proposition 1B funded project.
Issued: 10/28/2019
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations (Finance) completed an audit of the City of Coachella’s (City) Proposition 1B funded project.
Issued: 10/11/2019
Project Compliance Audit
At the request of the Independent Office of Audits and Investigations the California Department of Finance, Office of Audits and Evaluations completed an audit of the Port of Long Beach’s Proposition 1B funded projects.
Issued: 7/1/2019
Other Report
Issued: 6/6/2019
Other Report
Issued: 5/17/2019
Other Report
Issued: 5/15/2019
Performance Audit
Issued: 1/9/2019
Other Report
Issued: 10/1/2018
Other Report
Issued: 7/11/2018
Performance Audit
Issued: 6/28/2018
Performance Audit
Issued: 5/3/2018
Project Compliance Audit
Issued: 11/21/2017
Performance Audit
Issued: 7/21/2017
Project Compliance Audit
Physical Address:
1304 O Street, Suite 200 Sacramento, CA 95814
Mailing Address:
Mail Station 2
P.O. Box 942874 Sacramento, CA 94274-0001
