Add freezing temperatures and an earthquake and you would have had a giant milkshake.

A freeway off-ramp in Rowland Heights was closed for several hours on Sunday after a tanker truck spilled thousands of gallons of milk onto the roadway.

The truck overturned about 6:20 a.m. on the 60 Freeway. No injuries were reported. As much as 6,000 gallons of milk may have spilled across the road and down a storm drain, police said.

Caltrans crews closed the Nogales Street off-ramp from the eastbound 60 Freeway to clean up the mess. The off-ramp later was reopened sometime before 2 p.m.

The crash occurred in a construction zone, where lanes are restricted as the freeway is being widened for a carpool lane.