The USACE Walla Walla District completed repairs for the Dayton Levee Project on November 16 and began repairs on the Milton-Freewater Levee Project on November 18.
The Touchet River and Walla Walla River had near record flood events in early February 2020, causing extensive erosion damage to both levee systems in multiple locations.
Damage to the Dayton Levee Project was mainly along the riverside slope, with the exception of one location where the levee overtopped, causing erosion damage on the landside slope as well.
Furthermore, floodwaters breached the Milton-Freewater Levee Project in two places, which were repaired earlier this year, and caused extensive erosion damage throughout the rest of the levee system.
Construction on the Dayton Levee Project involved reestablishing and grading slopes, placing over 4,800 tons of rock (riprap and spalls) and placing fill material where the levee was overtopped.
The Corps awarded an $800,000 contract to Northbank Civil and Marine, Inc. The repairs will provide increased protection for over $200 million of exposed property in the area around the Dayton levee, said USACE.
On November 5, they awarded a $3.8 million contract to Keu Inc. for repairs to the Milton-Freewater Levee Project.
“The two levee breaches were immediately repaired in late February, around the Couse Creek Bridge under an emergency contract. Now, we are going back to repair the other damage sites,” Jeff Bonafilia, Plans and Project Manager for the Walla Walla District Corps of Engineers, said.
In fact, repairs will include reestablishing riverside slopes and replacing riprap for at least 22 damage sites along the right and left banks of the river. Also, construction is expected to finish by late January.