Engineers in Sacramento say this weekend's earthquake is a wake up call.
The quake could breach one of the levees or dams along the Sacramento River.
Scientists are testing a model of what could happen after an earthquake.
They say it could wipe out sediment under the levees, causing it to lose its shape and ability to hold back water.
However, officials say there are no immediate threats to the area.
Darren Suen with the State Floodsafe Program said, "Delta levees are a little more prone to failures because they're on softer soils because there's always water against them."
The 6.0 magnitude quake is the largest to hit the San Francisco bay area in 25 years.
Several aftershocks shook the area Tuesday morning.