Aging spans cover the nation as delayed maintenance may threaten drivers.
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But residents should remain vigilant, officials said Tuesday.
The nation's dams now earn an unnerving D grade.
Nearly 200,000 people have been evacuated.
Catching storm water before it drains into the ocean is a no-brainer. Especially when an El Nino can bring TWICE California's annual rainfall in a matter of months - a huge boon for a thirsty future.