Marine Construction Projects

Brannan Street Wharf
Construction Duration: July 2012 - 2013

The Brannan Street Wharf project involves building a wedge-shaped park along the Embarcadero waterfront in San Francisco. This park is being constructed in the location of Pier 36 that was recently demolished. Dutra Construction was awarded the $13.5 million dollar contract with the Port of San Francisco to build the park.

When the park is complete it will be 830 feet long by 40 feet wide at the short end and 140 feet wide on the long end. The wharf is supported by 146 octagonal precast piles and 116 steel pipe piles. Due to its proximity to the active thoroughfare, all work including pile driving and deck work is being completed via crane barges from the water side. A 16 inch thick structural deck containing over 3300 cubic yards of reinforced concrete is being constructed on top of the piles. Once the deck is complete, the landscaping work will commence and include a lawn area, seating area with park benches, and an artistic shade structure to match the Embarcadero’s art ribbon. Additionally, 2700 tons of large rip-rap will be placed along the seawall to protect the shoreline.

The Crane Barge 11 has driven all the pile for this project and the deck work is being facilitated by both the Crane Barges Doolittle and 11. The 24" octagonal concrete piles are 99 long and 24" steel pipe piles are up to 105' long. The structural deck will be complete by the end of 2012 and topside landscape work will be performed by Bauman Landscape, a local business in San Francisco and should be complete by July 2013.

Crane Barge 11 driving 24” octagonal piles at Brannan Street Wharf

Crane Barge Doolittle assisting the structural deck work with the Crane Barge 11 driving pile in the background.


Crescent City Harbor - Inner Boat Basin Reconstruction
Construction Duration: May 2012 – February 2014

The Crescent City Inner Boat Basin Reconstruction Project involves the rebuilding of the marina devastated by the tsunami in March of 2011. Given the backdrop of tsunami devastation in 1964, 2006 and again in 2011, Crescent City decided to upgrade and opted for their facility to be designed to withstand a 50 year event. Upon completion, the Crescent City Harbor will be able to boast a state-of-the-art robust facility that will last for generations. Dutra Construction is currently under contract with The Crescent City Harbor District for $33.2 Million to rebuild the inner boat basin.

The work consists of demolishing the existing wood and concrete docks and replacing them with 62,000 square feet of concrete floating docks. A total of 244 – 30” diameter steel piles are designed to withstand the power of a 50 year tsunami onslaught. Additionally, 2100 linear feet of bank will be reinforced with a concrete retaining wall and 60,000 tons of rip-rap.

Docks are being provided by Bellingham Marine through their Ferndale, WA facility. Reese Electric of Coos Bay, OR and Wayne Maples Plumbing and Heating of Eureka, CA are the major subcontractors. Piles were fabricated in China and Missouri being procured through LB Foster. Rock and ready mix concrete supplier is Tidewater Contractors of Brookings, Or.

This project is well underway and is on track to be completed by February of 2014.

CB Morty finishing demoltion and preparing to pile drive in Crescent City Habor

CB Morty driving 30” pipe pile at Crescent City Harbor


San Francisco West Harbor Marina Renovation Project
Construction Duration: April 2011 to January 2013

The San Francisco Marina is located on the northern waterfront of the city contiguous to the district that bears its name. Consisting of two harbors — east and west — the marina is the City’s oldest recreational facility of its kind with vessels having berthed in its original basin since before the 1906 earthquake. Currently, the marina is home to two yacht clubs— the St. Francis and Golden Gate— who will play host to the 34th America’s Cup in 2013. The 50+ year old wooden docks and piles in the marina were failing which prompted the City to solicit bids to rebuild the marina.

The City of San Francisco Parks and Recreation Department awarded Dutra Construction a $22 million dollar contract to design and rebuild the San Francisco West Marina Yacht Harbor in February of 2011. Dutra partnered with marine engineering firm Ben C. Gerwick to design the project.

The West Harbor Marina project consisted of designing the new marina, demolishing the existing treated wood docks, piles and gangways, dredging the marina to a depth of -12 feet by removing over 70,000 cubic yards of sediment (15,000 of which was contaminated and disposed of upland), furnishing and installing new concrete docks to create over 320 state of the art slips of various lengths and widths, driving over 400 piles throughout the marina, upgrading utility service, building and installing a floating wave attenuator at the mouth of the harbor, building a fixed sheet pile wall breakwater along the Marina Green, renovating the historic harbormaster building, removing an existing rubble mound breakwater known as the ‘West Mole’, performing various site repairs including cobblestone masonry seawall repairs and upgrading the landscaping throughout the marina grounds.

Keeping the marina operational during construction presented a major challenge to the project. Dutra created a strategic project phasing plan to keep two hundred boats of varying lengths inside the marina and provide boaters with access to use their boats at all times. In order to accommodate the boats, half of the existing marina was left in place and/or partially relocated while the other half was demolished, dredged and reconstructed in 2011. In early 2012, the boats were relocated from the old docks to the new docks. At this point the second half of the old marina was demolished, dredged and rebuilt.

Another challenge involved removing the West Mole land mass in the center of the marina which consisted of massive boulders down to -12 feet. These boulders were dredged with the DB-24 and placed on a flat deck barge and were reused onsite to stabilize the jetty at the entrance to the marina.

The capstone of the project involved the construction and installation of the 225 foot long floating wave attenuator. This breakwater was fabricated in five separate modules in Antioch, CA and launched into the water and was towed over 50 miles to the project site. Each module weighed over 100 tons and was 9 feet tall. Large pipe pile anchor piles were driven into the bay floor. The tops of these piles were connected to heavy duty anchor chain that was connected to the floating wave attenuator to hold it in place. This wave attenuator now helps reduce surfaces waves from disturbing the boats inside the marina.

San Francisco West Harbor Marina under construction with San Francisco skyline and Bay Bridge in background

San Francisco West Harbor Marina under construction with Golden Gate Bridge in the background

West Mole Removal with DB-24

Jetty repair with boulders from West Mole

Completed West Mole Excavation and New Seawall

First of five modules cast to make up the floating wave attenuator

CB Kelso dredging contiminated sediments from West Marina

CB Kelso driving 18” square concrete guide piles to secure docks in place

 

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