US Army Corps of Engineers
Los Angeles District

Los Angeles River Levee Wall Repairs

Published Oct. 17, 2017

Levee Wall Repairs

The Corps awarded a contract for like-for-like repair of damaged embankment and levee toe within the Glendale Narrows section of the Los Angeles River Flood Control Channel at Reach 4D. In order to conduct the repair, a limited portion of the channel will be dewatered. Approximately 3,000 square feet of vegetation and sediment will be removed to facilitate the dewatering process. A temporary access ramp into the channel will also be installed. Work began in the summer of 2017. The Corps is anticipating that the construction period will last approximately 5 months.

channel wall repair project area map

Levee wall repair project area map  


Weekly Progress: Week of 19 thru 23 June 2017

This week the U.S. Army Corps of Engineers’ contractor, JF Engineering, was able to mobilize into the lot off of Rigali Ave. Security fencing was set up on top of the levee, Conex boxes were placed in the staging area, and HESCOs were opened up to allow for access ramp construction. Also, the access ramp was constructed this week and the excavator has begun to remove derrick stone located along the levee toe to allow for the dewatering barriers to be installed. The Corps biologist also completed the pre-construction surveys for Endangered Species Act-listed wildlife species in the project area.

Rigali Lot

Rigali Lot will be used as a staging area for the project.

 

access ramp

Access ramp construction on 22 June, 2017.

 

Map

Map showing Ingress/Egress and project staging areas.


 Weekly Progress: Week of 26 thru 30 June 2017

This week JF Engineering finished moving derrick stone along the East bank grouted stone toe to install the water diversion barriers. K rails will be used to divert the water away from the damaged levee. After the water is diverted, dewatering systems will be put in place to “dry” out the repair area. Also on site this week, the Corps had their Geotechnical Engineer and Engineering Geologist survey the site in anticipation of the upcoming control and diversion of water activities. JF Engineering’s construction office was also set up in the staging yard at the end of Rigali Ave. 

water diversion system

K-rails will divert the water away from the repair area. After the water is diverted, 

dewatering systems will be put into place to dewater the area. 


Weekly Progress: Week of 03 thru 07 July 2017

This week JF Engineering is continuing to work towards diverting water from the left bank. An abundance of rock makes water diversion a difficult task. A liner will be brought in to help seal the K-rails against the channel bottom. The NPDES permit was approved by the Regional Water Quality Control Board which will allow the contractor to pump water out of the repair area to complete dewatering operations. 

water diversion

An abundance of rock makes water diversion a difficult task. 

A liner will be used to help "seal" the K-rails.

 

damaged levee exposed as water drawn down

Since some of the water is drawing down, more of the damaged levee is being exposed.


Weekly Progress: Week of 10 thru 14 July 2017

 

This week JF Engineering was able to remove the sediment and shoaling along the west bank and demolish portions of the damaged toe. A giant excavator with breaker attachment was used to break up the damaged sections of toe and embankment. Once the demolition is complete and the broken sections are cleared out, USACE Geotechnical Engineers and Geologists will assess the foundation before engineered stone is brought in and grouted in place.

demolition of west levee with excavator

After removing the sediment and shoaling to gain access to the repair area, a giant excavator 

with breaker attachment started demolition of the damaged sections of the West levee.

 

West levee repair section

Viewing the repair section of the West levee.


Weekly Progress: Week of 17 thru 21 July 2017

 

This week JF Engineering is finishing the demolition of the right bank grouted toe stones. The damaged sections of levee are being removed and hauled off for disposal. Once the damaged sections are removed the foundation will be prepared and inspected before the levee toe is reconstructed. A USACE Engineering Geologist and Geotechnical Engineer were on-site this week to inspect and monitor some of the construction.

USACE inspecting construction

A USACE Engineering Geologist and Geotechnical Engineer were onsite

 to inspect and evaluate the on-going construction.

 

demlished grouted stone toe hauled

The demolished grouted toe stones are hauled away after demolition.

 

Right bank repair area

Right bank repair area being prepared for excavation to finished grade.


Weekly Progress: Week of 24 thru 28 July 2017

 

This week JF Engineering is preparing the right bank finished grade. Once the excavation is restored to engineered line and grade, the repair area will be inspected by JF Engineering’s Geotechnical Engineer along with USACE Geotechnical Engineers and Engineering Geologists. After approval of the finished grade and once compaction requirements are met, reconstruction of the levee to its original configuration will begin.

Excavation being restored to original line, grade, and elevation

A level is being used to restore the excavation on the 

right bank to original line, grade, and elevation. 

 

Removing damages sections of grouted stone from left bank

Removal of damaged sections of grouted stone continue on the left bank.  


Weekly Progress: Week of 31 July thru 04 August 2017

 

This week JF Engineering is reconstructing the levee back to its engineered design. The levee stone toe is being built up in preparation for the grout. Once the stone is in place, the stone will be grouted in lifts back to the original design configuration. During a storm, the grouted stone armors the earthen levee from the harshness of the Los Angeles River.

reconstruction of the levee toe

Reconstruction of the levee toe has begun. Here, the 

stone protection is being placed before the grout. 


Bedding material is being placed on the embankment

Bedding material is being placed on the embankment 

as the levee stone toe is being constructed.


Weekly Progress: Week of 07 thru 11 August 2017

This week JF Engineering is placing the last lift of grout to complete the grouted stone embankment. The grouted stone armors the earthen levee and protects it from the storm flows. Without the protection of the grouted stone, harsh storm flows could erode the earthen levee which could cause the levee to fail.

final lift of grout places

The final lift of grout is being placed on the West levee. Once completed, the grouted 

stone will armor the earthen levee and   protect the embankment from the storm flows. 


workers place finish on gout

Workers at JF Engineering are putting the finish on the freshly placed grout.  


Weekly Progress: Week of 14 thru 18 August 2017

This week, JF Engineering finished the repair on the West levee. Since beginning the project, the damaged section of the levee was demolished, excavated to grade, and reconstructed to the engineered design. After the final placement of grout, interlocked derrick stone was placed in front of the levee toe to protect the base of the levee. JF Engineering will now switch their efforts to completing the East levee repair.

final lift of grout places

The final lift of grout was placed on 11 August, 2017. 

 

derrick stone protects grouted stone toe

Viewing North, this photo depicts the completed West levee repair.  


completed West levee repair

Big interlocked derrick stone protects the levee's grouted stone toe. 


Weekly Progress: Week of 21 thru 25 August 2017

This week JF Engineering finished excavating the East bank repair area to finished grade. USACE Geotechnical Engineers and Engineering Geologists were on site to inspect the subgrade before reconstruction of the grouted levee embankment can begin. Upon completion of the inspection, JF Engineering will be implementing some recommendations from the Geotechnical Engineer to achieve the compaction required for reconstruction to begin.

Left side repair excavated to finished grade

The left side repair area has been excavated to finished grade. 


Excavated Section, looking north.

Viewing North, this photo depicts the excavated section. Once it

 passes subgrade inspection, levee reconstruction will begin.


Weekly Progress: Week of 28 August thru 01 September 2017

This week once USACE approved the subgrade, JF Engineering began reconstructing the levee’s grouted stone toe. JF Engineering is working long hours and Saturdays to ensure the levee repair is completed and ready for the 2017 - 2018 storm season. The storm season officially begins 15 October, 2017. The first layer of stone was placed and grouted, thus completing the first of four lifts. 

Subgrade approved and construction began

On 30 August, a USACE Geotechnical Engineer and Engineering 

Geologist approved the subgrade so reconstruction can begin. 


First layer of stone placed

The first layer of stone was placed, in what will eventually become the levee’s grouted 

stone toe. Notice the conveyor “spraying” the bedding material onto the embankment.


First life of grouted stone tone completed Sept 1

The first lift of grouted stone was completed on 01 September,2017. After sufficient

 time has passed for the grout to “set up”, the second lift will be constructed.


Weekly Progress: Week of 04 thru 08 September 2017

This week JF Engineering was working in full force to complete the critical levee repair before the start of the 2017 to 2018 storm season. The second lift of stone was grouted on 07 September. The third lift is scheduled for 10 September after the second lift has cured for the minimum 72 hours specified. A fourth and final lift will be placed sometime next week. JF Engineering is anticipating having the repair completed by 23 September 2017.

Second lift of grouted stone placed

The second lift of grouted stone was placed on 07 September, 2017. 

After the grouted stone cures for 72 hours, a third lift will be grouted. 

 

Third lift of grouted stone placed

The third lift of stone is placed and ready for grout. Grout is scheduled for 

10 September after the 72 hour cure time specified for the 2nd lift. 


Weekly Progress: Week of 11 thru 15 September 2017

This week, ahead of schedule, JF Engineering is placing the last lift of grout to complete reconstruction of the levee’s grouted stone toe. Derrick stone will be placed early next week in front of the finished toe, thus completing the levee’s critical repair. The levee repair is expected to be completed by 23 September, well ahead of the October 15 flood season deadline.

final placement of grout

Taken from the top of the HESCO flood control barriers, this photo

 depicts the final placement of grout that occurred on 14 September, 2017.


Weekly Progress: Week of 25 thru 29 September 2017

This week JF Engineering completed the repairs of the critical levee structure. Ahead of schedule, and with no contract modifications, the critical levee repairs were a success, taking only about 3 months of construction to complete the repair. The levees are ready to handle the flows of the 2017 to 2018 storm season.

Before and after photo of the right side embankment cracking.

 

Before photos of the right side deteriorated grouted stone toe with scouring.  

Notice how the toe sinks down and disappears from the water.

 

final placement of grout

After photo of the right side levee repair. The levee's grouted

stone toe has been restored to original line and grade.

before photo of left levee grouted stone embankment

Before photo of the condition of the left levee's

grouted stone embankment and toe protection.

 

after photo of left side of levee repair

After photo of the left side levee repair.

 

after photo left side levee repair

After photo of the left side levee repair.

 

after photo left side levee repair

After photo of the left side levee repair.


For answers to frequently asked questions regarding Corps activities in the Glendale Narrows 

section of the Los Angeles River, please visit our FAQ page.

Have additional questions? Please email: AMoperations.Branch@usace.army.mil.


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