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American River Common Features Folsom Dam Modifications Folsom Dam Raise Folsom Dam Bridge
 


Jet Grouting
Jet grouting is used around bridges and utility lines, where a trench cannot be dug to place the wall. Crews drill into the levee near the bridge or utility, and inject the slurry mixture into the levee using high-pressure water and air nozzles.      
       
Jet grouting and other specialized methods allow the Corps to strengthen the levee system at more than 20 sites near bridges and deep utility crossings where open trench methods would disrupt traffic and interrupt utility services.

Jet grouting adds complexity and additional costs to the strengthening of the levee system. These costs were not originally authorized in the Water Resources Development Act (WRDA) of 1996, but were later authorized by Congress in the WRDA of 1999.

 

 
   
   
n Levee work
n Slurry wall
n Common Features Project Map
 
   
Jet grouting drill rig
To reach deep into the levees, the contractor had to add 30 feet to the height of the jet grouting drill rig, making it 80 feet tall.