Prohibits toll charges, other revenue, and interest deposited into the Tacoma Narrows toll bridge account from being used to satisfy a requirement from the office of the state treasurer regarding a sufficient minimum balance as a contingency that would cover forty-five days of operating expenses.

Authorizes the office of the state treasurer to require that a sufficient minimum balance be retained in a state account or multiple state accounts to provide a contingency that would cover forty-five days of operating expenses for the Tacoma Narrows bridge only if the office has adopted a rule, in consultation with the transportation commission, requiring such a balance.