The CREHST museum in Richland is expected to cut its hours of operation later this month.
The Columbia River Exhibition of History, Science and Technology on Lee Boulevard will close Sundays and Mondays, though officials haven't decided exactly when the change will take effect.
The museum currently is open seven days a week.
But savings are needed to meet the goal of continuing operations until the planned Hanford Reach Interpretive Center opens next year, said Lisa Toomey, CREHST interim executive director. She's also the Reach CEO.
She didn't go into budget details but said "we're going to have to make some changes to do our best to keep that promise" of keeping CREHST open until the Reach center is built.
Some staff cuts or reassignment of duties also could be on the horizon, she said.
The museum has about seven part-time employees in addition to Toomey.
CREHST was created in 1996 and a main focus has been telling the story of the Manhattan Project and the Hanford nuclear reservation.
The Environmental Science Technology Foundation operates the museum. Foundation officials decided some time ago to begin integrating CREHST into the Reach center once construction of that facility began.
However, the Reach project was long delayed.
It's moving forward now with a scaled-back design and the first building is scheduled to open next June at the west end of Columbia Park. Site and infrastructure work started in March.
Toomey joined the Reach at the beginning of 2012. And after CREHST's former director stepped down in May, Toomey was asked to take over as interim executive director.