Washington's state government operates on a fiscal biennium that begins July 1 of each odd-numbered year. Supplemental budgets are typically enacted in each of the following two years after the adoption of a biennial budget. Appropriations are made in the biennial and supplemental transportation budgets for the operation and capital expenses of the state transportation agencies and programs.
The 2023-25 State Transportation Appropriations Act (Transportation Budget) appropriated a total of $13.5 billion from a number of transportation accounts.
House Bill 2134 increases appropriations for the 2023-25 fiscal biennium by $1.6 billion. Fund transfers and other changes to the 2023-25 Transportation Budget are also made.