This section provides definitions for terms used in the article. "Fish passage" refers to how well anadromous fish can reach their necessary habitats throughout their life stages, such as during spawning. "Department" refers specifically to the Department of Transportation.

This law requires the Director of Transportation to create a yearly report on the progress of removing obstacles that block fish passage, and submit it to the Legislature by October 31st until 2025. Each report must detail updates on the status of various projects aimed at fixing these barriers, which were identified according to a specific section of the law.

The reports should include updated information from the Department of Fish and Wildlife, funding details such as amounts and sources, a budget summary, and the results of inspections on culverts (which are structures allowing water to pass under roads). The report should also include the project work plan and the expected completion date for each project.

This law directs a government department to work with state and federal agencies to create a simplified process for reviewing environmental impacts when removing barriers to fish movement in waterways. The goal is to make it easier to get permits for such projects. The department must report their progress on this effort in a specific report.

This law requires that for any project funded with state or federal transportation money after January 1, 2006, if the project impacts a stream crossing where fish like salmon or trout are found, an assessment must be done to identify any barriers to fish passage. This assessment has to be given to the Department of Fish and Game and entered into the CALFISH database. If there are barriers, the project must include solutions to fix them. All new projects must ensure they don't block fish passage. Any plans to address fish passage barriers must be made in collaboration with the Department of Fish and Game.

This law requires that for construction or repair projects using state or federal transportation funds that impact stream crossings where migratory fish, known as anadromous fish, currently exist or historically existed, the responsible department must assess the site for any possible obstacles to fish movement. This assessment must then be submitted to the Department of Fish and Game.

This law requires the Department of Fish and Wildlife to identify projects that significantly block fish passage. It then mandates prioritizing and speeding up the removal of these barriers. For the 2015–16 fiscal year, it allocated $5 million from the State Highway Account to the Department of Transportation for identifying and fixing these important fish passage issues, in line with this section and Section 156.1.