Using the Washington State Population Survey (WSPS) augmented with results from the Urban Institute's Health Insurance Policy Simulation Model (HIPSM), we estimated eligibility, enrollment, and costs for a Basic Health Program (BHP) for Washington State under the rules defined in the Affordable Care Act (ACA). We find that more than 160,000 Washington residents would be eligible for BHP. Enrollment would be between 75,000 and 111,000. Even with BHP, the exchange in Washington would still cover about 250,000 lives, and BHP would not notably affect premiums in the individual market.