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Hamilton Airfield Wetland Restoration




The project site is located on San Pablo Bay, four miles east of the city of Novato, Marin County, California. The project includes a 988-acre parcel with a former military airfield, adjacent California State Lands Commission areas, and the 1,612-acre Bel Marin Key Unit V (BMKV) parcel. The levee-protected site has subsided below the elevation of the surrounding properties, including the tidal wetlands immediately adjacent to San Pablo Bay. This project allowed for the beneficial use of 24.4 million cubic yards of dredged material, including 3.5 million cubic yards from the Port of Oakland 50' Deepening Project. This wetlands-restoration project can continue advance the beneficial use of dredge material from San Francisco Bay as part of the Long Term Management Strategy (LTMS) with the BMKV portion.

In April of 2014 the first phase of restoration was completed.  Known as the Hamilton Wetland Restoration Project (HWRP), the airfield’s bayside levee was breached, opening the site to bay for the first time in over in over 100 years, resulting in 648 acres of restored wetland habitat, with the use of LTMS in the San Francisco Bay.  In June of 2014, 2.7 miles of a new public trail at the edge of the wetlands was completed.   The HWRP portion is currently in the monitoring and adaptive management phase of the project.





$ 286,219,000


$ 214,182,000


$   70,037,000




$   86,264,000


$                   0


$ 125,918,000


  • The restored site is currently in Year 3 of the 13 year monitoring and adaptive management phase.  Three years after the breach, the site overall, has performed well and is on track to meet project performance criteria set in the Monitoring and Adaptive Management Plan (MAMP). 
  • Nursery management and planting. Native vegetation populations are on the rise, but still at risk from invasive species.  Revegetation is critical to the success of the site.
  • Results of the bird and fish use at the site continues to be encouraging, with native populations dominating the landscape. 
  • The tidal marsh shows nearly full tidal range, as sediment elevation rise, channels are beginning to form.  
  • Continued monitoring and adaptive management of the site. 
  • Year 2 – 2017 Monitoring (MAMP) Report
  • Year 2 – Technical Adviosry Committee (TAC) Meeting
  • Address Adaptive Management Actions, including the TAC’s Action List and other remedial actions, including Erosion at the North Season Wetlands Berm Erosion, South Seasonal Wetland Pond Berm Erosion,Water Managment and Revegetation. 


  • Scaled back Nursery management and planting
  • Monitoring and adaptive management of the site
  • Year 3 – 2017 Monitoring (MAMP) Report
  • Year 3 – Technical Adviosry Committee Meeting
  • Address Adaptive Management Actions, including the TAC’s Action List and other remedial actions, including N2 Levee Erosion, Water Managment and Revegetation. 


The California State Coastal Conservancy (SCC) is the non-Federal sponsor.

A General Re-evaluation Report (GRR) was completed in 2003 and a Chief's Report was signed in July 2004, recommending the adjacent 1612-acre BMKV property be added to the Hamilton Construction Authorization.

The BMKV parcel was authorized as part of the Hamilton project in the Water Resources Development Act (WRDA) of 2007, and an Aquatic Transfer Facility (ATF) was pursued as a more cost effective mode of transporting dredge material to the site.

A draft Supplemental Environmental Impact Statement/Environmental Impact Report (EIS/EIR) for the ATF was released to the public on 17 October 2008.

Because of environmental issues and the State budget, the Corps and State annotated technical comments and shelved the ATF Supplemental EIS/EIR draft document until further notice.

The San Francisco District (SPN) and NFS coordinated a PCA amendment to include BMKV per Water Resources Development Act WRDA 2007 authorization.  The approval of the PCA amendment will allow Land, Easements, Rights-Of-Way, Relocation, and Disposal Areas (LERRDS) crediting of the BMKV parcel, which was purchased by the NFS in 2001, and the use of federal matching funds for the project. However, at issue was the 65/35 project cost share for the Hamilton-BMKV project. The NFS asked for a review of the cost share ratio with the stipulation that the PCA amendment would be signed only if the original authorization’s 75/25 cost share continues. The Assistant Secretary of the Army, Civil Works (ASACW) determined that legislative action was required to maintain a 75/25 cost-share.

WRRDA 2014 Section 1030(d) returned the cost share percentage back to 75/25.

Regarding BMKV, the NFS is proceeding with design and build of the BMK V Project Levee under a Section 221 Memorandum of Understanding (MOU), dated 8 Mar 2017, for work provided or performed prior to execution of a Project Partnership Agreement. 

For BMKV Conservancy’s design plans will align part of the BMKV project levee differently than the description in the approved 2010 Integral Determination Report (IDR).  Because the design is configured substantially differently than that in the plan recommended in the General Reevaluation Report (GRR) authorized by Congress in WRDA 2007, the Corps must undertake an analysis to  determine whether the propose

changes are within the existing Congressional authorization. 

The NFS is looking for ways to reduce the cost of BMKV, which primarily means reducing the placement of dredge material.  This would impact the region’s LTMS goals, as well as delay the restoration of BMKV to wetlands.

An amendment to the PCA to cost share the Bay Trail 50/50 as authorized in WRDA 2007 was executed on 20 June 2013.  Construction of the Bay Trail was completed prior to opening the site to tidal action as per environmental permit requirements.


  • 2nd District, Rep. Jared Huffman    


  • Deputy for Project Management, Arijs A. Rakstins, (415) 503-6720

Updated on 26 February 2018

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General Questions
1455 Market Street
San Francisco, CA 94103