Post-Flood Levee Rehabilitation Nez Perce, Payette and Boise Counties, Idaho
The Walla Walla District Corps of Engineers (Corps) is working with local sponsors to rehabilitate three levees in Idaho that were damaged by floods in 2010 and 2011. These non-federal levees include Horseshoe Bend, managed by the City of Horseshoe Bend; Chapman, managed by Payette County; and Sweetwater, managed by Nez Perce County. The Corps is proposing to repair these levees Public Law (PL) 84-99, Flood Control and Coastal Emergencies Act.
The following rehabilitation activities are being considered for the levees:
- Sweetwater Levee: Water seeped through a portion of this levee during a high water event in 2011. The Corps and the local sponsor are proposing to excavate a trench through the top of the levee and remove the portion that has been compromised. A geotextile curtain would be installed in the trench and the trench backfilled with impervious soils.
- Chapman Levee: During 2010 water seeped through the levee and caused erosion on the landward side of the levee. The Corps and the local sponsor are proposing to restore the eroded areas using fill and rock.
- Horseshoe Bend Levee: Portions of this levee were damaged during flooding in 2010 and 2011. The Corps and the local sponsor are proposing to repair a 1300 foot segment of the levee. The severely damaged area would be reconstructed using rock and fill. Rock (rip-rap) would be placed on the slope to stabilize and armor the levee.
Environmental Assessment for the Rehabilitation of the Levees
The Corps has prepared an Environmental Assessment (EA) to address potential effects associated with the proposed â€œPost-Flood Levee Rehabilitationâ€ and any reasonable alternatives.
U.S. Army Corps of Engineers, Walla Walla District
CENWW-PD-EC, ATTN: Idaho Levee Rehabilitation Project
201 North Third Avenue
Walla Walla, WA 99362-1876
Comments may be e-mailed to firstname.lastname@example.org.
If you have any questions or need additional information, please contact the Environmental Compliance Representative at 509-527-7265.