Laguna Creek (Zone 6, Line E) is a flood control facility comprising a combination of earthen channels and street culvert crossings that starts at San Francisco Bay and extends eastward across I-880 to Lake Elizabeth in Fremont. The Laguna Creek Watershed drains into San Francisco Bay and has a drainage area of more than 25 square miles. The majority of the watershed is developed with both residential and commercial property.
The Laguna Creek flood control facility was constructed prior to the establishment of FEMA’s National Flood Insurance Program (NFIP) and was designed to contain a 15-year design storm with one foot of freeboard. Under current NFIP requirements, the existing flood control facility is unable to contain the FEMA 100-year (1 percent annual chance of occurring) design storm.
A series of nine improvement projects will contain and convey the FEMA 100-year design storm flow to San Francisco Bay. Construction of these improvements will enable the District to apply to FEMA for a Letter of Map Revision (LOMR), which will remove the existing 100-year floodplain designation. Upon FEMA’s approval of the LOMR applications, the mandatory flood insurance purchase requirement will be lifted.
The nine projects will be carried out in three phases between 2017 and 2024. Additionally, the work will include traffic control improvements at points along Auto Mall Parkway, Fremont Boulevard, and Roberts Avenue. Tree planting to enhance the landscape is also planned where appropriate.