| 1988 | STA was created as a local transportation authority and the original Measure A was approved by the voters. |
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| 1990 | STA was designated as the Congestion Management Agency (CMA) for Sacramento County. |
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| 1991 | The STA Governing Board accepted the designation as the Sacramento Abandoned Vehicle Service Authority (SAVSA) and imposed an annual vehicle registration fee to implement the program. |
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| 1992 | STA, California Highway Patrol (CHP), and California department of Transportation (Caltrans) initiated Freeway Service Patrol (FSP) in Sacramento County for the first time. |
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| 1999 | STA, CHP, Caltrans, and Yolo County Transportation District (YCTD) extend Freeway Service Patrol into Yolo County. |
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| 2001 | STA governing board voted to extend the SAVSA program for 10 years. |
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| 2004 | The extension of Measure A was approved by voters with more than 75%. The new Measure A began in 2009 and will end in 2039. |
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| 2011 | STA governing board voted to extend the SAVSA program for 10 years. |
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| 2016 | STA placed Measure B, a new ½ cent transportation sales tax measure, on the ballot. Measure B received nearly 66% approval by voters but not the required two-thirds approval needed. |
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| 2017 | Senate Bill 1 (SB 1), officially known as the Road Repair and Accountability Act of 2017, was signed into law by Governor Jerry Brown. STA approved the use of SB 1 Local Partnership Formulaic Program for projects in Sacramento County for the first time. |
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| 2022 | STA placed Measure C, a 10-year extension of SAVSA, on the ballot. Measure C received nearly 58% approval by voters but not the required two-thirds approval needed. |
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