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Natomas Levee Project

Natomas Levee project

Natomas Levee Project—U.S. Army Corps of Engineers 

Goal:  Complete levee improvements started by SAFCA/State to provide Natomas Basin at least 200-year flood protection

Project Status:  Project is fully authorized by Congress (2014 Water Resources and Reform Development Act).  Appropriations are made on an annual basis

Cost Sharing Partners:  SAFCA (local) and Central Valley Flood Protection Board (State)

Operation and Maintenance Responsibility:  Reclamation District No. 1000

Construction Status:  See Construction Phasing Map

November 2022 Status:

Reach A

i.      The Contract was awarded in September 2021 to Ahtna-Great Lakes (joint venture) for the base contract levee work. The contractor has completed a demonstration cut off wall panel. Testing will occur following 28 days of cure time. Construction will last for three years.

ii.     Modifications to Plant 1B and 1A have been included in the project.  The contract includes the provisions in the agreement between the District and SAFCA to ensure Plant 1A and 1B are operational during the flood season throughout the project and partial operation of Plant 1B during the irrigation season for rice drainage.

iii.   The demonstration section has been completed, which is new slurry wall mix design and construction method. Core tests are in progress.

iv.   SAFCA/State continue coordinating with the Corps on SMUD, AT&T and PGE relocations which are underway but have delayed the start of levee construction.

Reach B

i.      Construction continued on Reach B including relocation of the Riverside Canal and replacement of other Natomas Water Company facilities. The Corps will now acquire borrow material from the Port of Sacramento.

ii.     Outfall, discharge pipes, pumps and electrical replacement has been completed. O&M training is scheduled for October 7th. All 4 pumps are operational if needed. Official pump testing will commence when adequate water levels are reached in the drainage canal.

iii.   Construction at the I-5 window crossing the Sacramento River south of Bayou Road which began in 2021, this project is nearing completion. A pre-final inspection was performed last week.

Reach C

i.      The Reach C project is complete, and the District is providing the operation and maintenance.

Reach D

i.      The reconstruction of Pumping Plant 4, discharge pipes and outfall structure has entered month 18. The plant will be non-operational this flood season as the electrical protection equipment delivery is September 2023. Completion target date of Plant 4 is October 2022. Coordinating with USACE, M&H and NMWC related to minor temporary power for electrical building and exterior lighting after contractor demobilizes from site.

ii.     The Corps is working on the package to turn the previously completed levee improvements in Reach D over to the non-federal sponsors (and RD 1000) though the District has effectively taken over the O&M of the levee.

Reach E

i.      The plans and specifications for this reach are complete. The Corps is doing its final internal review and working with their contracting group to advertise the project for construction. The contract award has been delayed until April awaiting right of way certification and utility relocation.  However, construction is still scheduled for 2023 and 2024.

ii.     SAFCA has acquired all the right of way for construction and utility relocations but is awaiting the rice harvest to get physical possession of the property. This includes the Brookfield property which could yield sufficient borrow for the remainder of the Natomas project. SAFCA is coordinating with PG&E for the relocation of the utility poles which has been delayed until 2023.

Reach F

i.      The State, SAFCA and RD 1000 have provided comments to the Corps on the 95% plans. We continue working with the Corps on key issues affecting design; particularly the proposed takes on properties with existing structures, the work near Pumping plant No. 6, relocate or design around WAPA tower, and the borrow source currently proposed from the former Brookfield property now owned by SAFCA.  The 100% plans are to be delivered by the end of 2022 for review.

ii.     Critical issues include right of way acquisition (some which require relocations); WAPA tower (lead time for relocation more than a year); utility relocations and borrow source. Based on potential right of way acquisition and utility relocation delays, the Corps is revising their schedule to delay construction until 2025 with completion as late as 2027. SAFCA is trying to reduce the right of way acquisition time to allow construction to commence sooner.

Reach G

i.      See notes above for Reach F as Reaches F and G are combined into a single design and construction contract.

Reach H

i.      Construction at Reach H continues, including fence relocations, landside lower patrol road and I-80 berm. SAFCA continues acquisition of rights needed to complete patrol road and fence relocations. This project will continue through 2022 as these contract modifications are negotiated and rights of way acquired.

Reach I

i.      Construction of the cutoff wall has been completed and project finalization and turnover to SAFCA and the District is in progress. A final construction report has been submitted for SAFCA and the District to review.

Design for the Reach I Contract 2 to construct a patrol / maintenance road and perform levee slope flattening has been completed. SAFCA is working on real estate acquisition and coordination with utilities for relocation. Contract for tree removal was awarded in January 2022 and has stopped now. The remaining trees will be removed in late 2022 (November/December). The levee construction is scheduled to be done in 2023.

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Map of the Natomas Basin showing project segments

 Natomas Levee Project Map