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E5: San Francisquito Creek Flood Protection*

About This Project

The project is sponsored by the San Francisquito Creek Joint Powers Authority (SFCJPA), of which the District is a member agency, in partnership with the U.S. Army Corps of Engineers (USACE). The project builds on the planning and design tasks initiated as part of the Clean, Safe Creeks plan.

Preferred project: A federal-state-local partnership

This project will complete construction of setback levees and floodwalls from San Francisco Bay to Highway 101 to provide 1% (or 100-year) flood protection and ecosystem benefits. Upstream of Highway 101 the project will provide 1% flood protection, ecosystem protection, and recreational benefits. The work upstream of Highway 101 will remedy channel constrictions and modify bridges at Newell Road and Pope/Chaucer Street, and include; a combination of: modified bridges at University Avenue and Middlefield Road; upstream detention; under-ground bypass channels; and floodwalls.

Local-state-funding-only project:

The local-state-funding-only project will be the same as the preferred project downstream of Highway 101; but upstream of Highway 101, the project will remedy channel constrictions and modify bridges at Newell Road and Pope/Chaucer Street to allow the channel to contain flood waters equal to the channel’s capacity of 7,000 cubic feet per second, approximately a 30-year event. Allowing this level of water to flow through the channel will protect approximately 3,000 parcels in Palo Alto from a flood event close to the February 1998 flood, the largest on record. Currently the channel can only convey a 15-year flood event. If sufficient funding becomes available, a 1% flood protection project upstream of Highway 101, including some combination of: modifications to the University Avenue and Middlefield Road bridges; upstream detention; underground bypass channels; and floodwalls, could be built.

 

*This project was voter approved as part of the Safe, Clean Water and Natural Flood Protection Program.

Construction
Datapoints
Status
On Target
Location
Palo Alto
Phase
Bay to Hwy. 101: Construction, Upstream of Hwy. 101: Design
Schedule
Start FY 2014 / Finish FY 2020
Funding
Safe, Clean Water Fund ($50.1 million), Watershed Stream Stewardship Fund, San Francisquito Creek Joint Powers Authority
News and UpdatesNews and Updates
Reports and DocumentsReports and Documents
Environmental and Community BenefitsEnvironmental and Community Benefits
History and BackgroundHistory and Background
News & Updates

Bay to Highway 101 Reach (Downstream)

Construction began in summer 2016, is currently underway, and is scheduled to be completed in early 2019.

View the downstream project construction updates.
 

Upstream of Highway 101 Reach (Upstream)

After receiving input from the community in 2013, the SFCJPA determined the need for a smaller scale project that addresses creek flooding similar to the 1998 flood and that is achievable with current funding constraints. It is now proposing to evaluate 5 project alternatives: 1) no action; 2) modify Pope-Chaucer bridge and widen creek channel bottlenecks; 3) construct one or more upstream detention basins; 4) construct an underground bypass culvert; and 5) construction floodwalls along the channel.

Four public scoping meetings were held in January and February 2017 and the SFCJPA will develop a Draft Environmental Impact Report (Draft EIR) to evaluate the environmental impacts of each alternative. The release of the Draft EIR, as well as a public review period and additional public meetings, are planned for spring 2018.

Simultaneously, the U.S. Army Corps of Engineers is preparing a similar federal document, a combined Feasibility Study and Environmental Impact Statement (FS/EIS). The Army Corps will evaluate alternatives for a single purpose flood risk project, which could include combinations of solutions (floodwalls, bypass channel, etc.) to identify the alternative with the best cost-benefit ratio.

The SFCJPA and Army Corps are working together to develop environmental documentation that will result in the locally preferred plan. The environmental review processes include multiple opportunities for the community to provide comments and feedback about the alternatives being analyzed.

  • A separate environmental review for the replacement of the Newell Road Bridge is being managed by the City of Palo Alto. A Draft EIR is expected to be developed in 2017. For more information, visit the city’s website.

  • Caltrans is currently replacing the Highway 101 bridge and frontage roads to improve traffic flow and allow channel widening and expects the new bridge to be completed in 2017.

 

Updated September 2017

For more information:

Environmental & Community Benefits

Key Performance Indicators for the Safe, Clean Water Program 

On June 10, 2014, the Board conducted a public hearing on the modification to the San Francisquito Creek Flood Protection Project. Below is the modified text of the preferred project with state and local funding:

The work upstream of Highway 101 would remedy channel constrictions and modify bridges at Newell Road and Pope/Chaucer Street, and include; a combination of: modified bridges at University Avenue and Middlefield Road, upstream detention, underground bypass channels, and floodwalls.

  1. Preferred project with federal, state and local funding: Protect more than 3,000 parcels by providing 1% flood protection.

  2. With state and local funding only: Protect approximately 3,000 parcels from flooding (100-year protection downstream of Highway 101, and approximately 30-year protection upstream of Highway 101).

Benefits

  • Provides 1% flood protection for approximately 3,000 homes and businesses in Palo Alto

  • Reduces bank erosion and sedimentation-related impacts along San Francisquito Creek

  • Provides new or improved habitats for endangered species 

  • Improves water quality

  • Enhances recreational opportunities for the community

  • Leverages dollars via cost-shares and grants from the state Department of Water Resources and the California Department of Transportation

Geographic Area of Benefit

Palo Alto 

History & Background

Flooding History and Project Background

San Francisquito Creek is one of the last continuous riparian corridors on the San Francisco Peninsula, and is also home to 1 of the few remaining viable steelhead trout runs. The creek can cause severe flood damage with very little warning and has overflowed 7 times since 1910.

During the February 1998 El Niño event, record flooding caused an estimated $28 million in damages in Palo Alto, East Palo Alto and Menlo Park. More than 1,100 homes were flooded in Palo Alto, and Highway 101 was closed, as were numerous other roadways. The largest flood on record prior to 1998 occurred in December of 1955 when the creek overtopped its banks in several locations, inundating about 1,200 acres of commercial and residential property. Damages were estimated at nearly $2 million in 1956 dollars. Total damages from a 1% flood event are estimated at $300 million in Santa Clara and San Mateo Counties, as calculated by the USACE in 2011.

About the Safe, Clean Water and Natural Flood Protection Program

In November 2012 the voters of Santa Clara County overwhelmingly approved Measure B, the Safe, Clean Water and Natural Flood Protection Program, as a countywide special parcel tax for 15 years with a sunset date of June 30, 2028. This Program replaced the Clean, Safe Creeks and Natural Flood Protection Plan, which voters approved in November 2000.

The Safe, Clean Water Program was developed with input from more than 16,000 residents and stakeholders and was created to match the community’s needs and values. The voters of Santa Clara County identified five priorities:

Priority A: Ensure a Safe, Reliable Water Supply

Priority B: Reduce Toxins, Hazards and Contaminants in our Waterways

Priority C: Protect our Water Supply from Earthquakes and Natural Disasters

Priority D: Restore Wildlife Habitat and Provide Open Space

Priority E: Provide Flood Protection to Homes, Businesses, Schools and Highways

Other: Six projects from the Clean, Safe, Creeks Plan have been carried forward into the Safe, Clean Water Program

Each year, the District prepares a report providing a progress update for each of these Program priorities, along with fiscal year accomplishments.

To ensure transparency and accountability to the voters, the ballot measure also created an Independent Monitoring Committee, appointed by the Santa Clara Valley Water District Board of Directors. The Independent Monitoring Committee annually reviews the Program’s progress to ensure the outcomes are achieved in a cost-efficient manner and reports its findings to the Board.

In addition, the Program requires three independent audits, the first of which was conducted in FY 2017.

View the Safe, Clean Water Program’s annual reports, annual IMC audit reports, and independent audits, including a staff response, on the District website.