State gambling regulators have allowed more slot machines, 24-hour casinos and high-stake games among other things.
While the deal seems certain to go through, Republicans are voicing their concerns about the largest growth of gambling in the state's history.
By a 5-3 vote, the Washington Gambling Commission approved new compacts with 27 tribes that will allow them to draw more gamblers, and also to draw a lot more money. But the pacts also place a limit on the number of casinos and require tribes to help finance programs aimed at problem gambling and smoking-cessation programs.
The big increase must still be signed by Governor Christine Gregoire, but her approval is almost certain. After her approval, the tribes will send them to the U.S. Interior Department for approval.
The entire process is expected to take about five months.
State gambling regulators have allowed more slot machines, 24-hour casinos and high-stake games among other things.