The City of Long Beach will begin constructing new seawalls this
week along one portion of the Rivo Alto Canal in Naples Island. The
section stretches from the Ravenna Bridge to the eastern portion of
The Toledo Bridge, about 1,900 linear feet between the north and
south sides. This project is the first phase of a multi-phase
replacement of the public seawalls surrounding the island.
"The repairs in this portion of Rivo Alto Canal are imperative to
maintaining the integrity of the island, which is an asset the City
aims to preserve and enhance for future generations," said
Mayor Robert Garcia. “This investment preserves a beautiful
area of our city that provides aquatic recreation in the canal as
well as a wonderful right-of-way for the public to enjoy as
The new seawalls will consist of stainless steel sheet piles coated
to prevent rust in the marine environment. The 47 ½ foot sheet
piles will be driven into the ground using silent piler technology,
which also limits vibration and liquefaction. The project will also
install accessible and code-compliant sidewalks, stairs for
accessing gangways, ladders that lead to private slips, a new
guardrail, and a new storm drain.
“This project is truly a feat of modern engineering,”
said Councilmember Suzie Price. “The City has been working
diligently alongside residents to bring this project to fruition. I
am very pleased to see construction beginning to preserve and
enhance this unique part of Long Beach.
Phase one, budgeted at $9 million, is being financed with Tidelands
Operations Funds, and has a completion date of June 2015. During
construction, the sidewalks on this portion will be closed to the
public. Visitors can complete a full circle of the island by
passing through the alleyways. Other sidewalks on the island will
not be impacted. The waterway will remain open until December 15,
allowing the annual boat parade to pass through. Afterward, the
canal will close to all motorized vessels with the exception of
boats owned by canal residents.
In 2009, an engineering study determined that some portions of the
seawalls have “significant risk of 'global' failure due to
their present deteriorated condition, if the site experiences a
‘moderate’ near-source earthquake.” The study
divided the public seawalls into 6 phases, with the first phase
addressing the areas that are in the most severe
The Rivo Alto and Naples Canals were constructed in the early 1900s
in the delta of the San Gabriel River, which is the area that is
now Alamitos Bay. The existing vertical concrete seawalls were
built in the late 1930s after the Long Beach earthquake in 1933.
Subsequent repairs were made in the late 1960’s.
For more information, please contact Rachael Tanner, public
liaison, at Rachael.Tanner@longbeach.gov