Corps Repairing Union Slough Levee

Repairs to the Union Slough Levee started in earnest yesterday as the U.S. Army Corps of Engineers officials commenced construction on a 100-foot-long damaged segment on the southwest corner of Smith Island, just south of Everett’s Water Pollution Control Facility.

Located on the Snohomish River’s right bank, the $86,000 project will address sloughing, slope scour, and the loss of embankment material caused during high river flows in November 2014.

Damages reduced the levee’s flood defense to a five-year level of protection, or a 20 percent chance of occurring in any given year.

Once repaired, the levee will be restored to a 20-year level of protection, or a five percent chance of occurrence. Under a cost-share agreement, the Corps pays for 80 percent of construction costs and Snohomish County Diking District #5 picks up the remaining 20 percent.

Repairs to the segment include rebuilding erosion protection along the 100-foot damaged section with an additional 25 feet on both sides for tie-in purposes, regrading the levee slope to make it more gradual on the riverward side, and adding a blanket of rock armor to protect against erosive river flows.

The construction plan calls for the reuse of existing spall rock and riprap for the repair, meaning a minimal need for new materials.

Construction is expected to be complete by the end of September, restoring the levee to its designed 20-year level of flood protection.

Share this article

Follow Dredging Today

Events>

<< Sep 2019 >>
MTWTFSS
26 27 28 29 30 31 1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 1 2 3 4 5 6

2019 Western Dredging Association Gulf Coast Chapter Annual Meeting

The meeting will provide a forum for the exchange of information of interest to the dredging industry and its associates.

read more >

Global Dredging Forum

2 day conference on the commercial activities of ports. How to meet the global demands of new vessels in an increasingly competitive market.

read more >

Eastern Chapter WEDA Fall 2019 Conference

Wednesday (10/16/19) afternoon will start the program with an opportunity to take the Dredging 101 course.

read more >

DREDGING FOR SUSTAINABLE INFRASTRUCTURE INDIA

At this 1-day conference, you will experience what it means to apply this new approach in practice.

read more >

Jobs>

Dredging jobs in Abu Dhabi at NMDC

National Marine Dredging Company “NMDC” aims to be the largest dredging player in the Arab’s Gulf region...

apply

Looking to fill a job opening?

By advertising your job here, on the homepage of DredgingToday.com, you'll reach countless professionals in the sector. For more information, click below...

apply

Looking to fill a job opening?

By advertising your job here, on the homepage of DredgingToday.com, you'll reach countless professionals in the sector. For more information, click below....

apply