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Navigation & Channel Improvements

Wrangell Narrows Navigation Improvements, Petersburg, Alaska.

Wrangell Narrows is a 24-mile-long narrow passage between Mitkof and Kupreanof Islands. Extending along the North Pacific coast from Puget Sound to the Gulf of Alaska, this passage is a link in a chain of protected waterways for cruise ships and ferries. NCI prepared and evaluated alternative channel deepening and widening plans to accommodate larger commercial ship traffic through this 24-mile inland passage. Analyses included development of channel design criteria; alternative channel configurations; dredge quantities; and detailed construction cost estimates that ranged from dredging in soft materials to blasting of rock. Channel alignments were selected to maximize navigability and to minimize dredging where possible.

San Leandro Marina Facilities Replacement, San Leandro, CA.

This marina replacement project included the relocation of 13 steel pile aids-to-navigation (ATON) along a two-mile entrance channel to the marina basin. NCI's services included preparation of plans, specifications, bid documents, cost estimate, and performance of construction management and inspection to oversee the widening of this entrance channel. These ATON structures included piles, platforms, lanterns and ladders. A geodetic survey was required for the relocated ATON structures, with submittals to the National Geodetic Survey and the U.S. Coast Guard.

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Anaheim Bay Modernization, Naval Weapons Station, Seal Beach, CA.

NCI performed the engineering feasibility study for expansion of the existing harbor facilities to support AOE-6, BB, CG, CGN, CV, and LHA class ships. A three-phase plan to improve the port's deep draft navigation, berthing areas, and infrastructure was formulated consisting of interior and offshore terminal alternatives. The approach channel, entrance channel, and turning basin areas were reconfigured based upon an analysis of safe navigation criteria and consultation with Port pilots. Modification of the existing jetty structures was specified to widen the channel and turning basin areas, to divert recreational small craft from the deep draft maneuvering space, and to create sheltered berths.

Port Hueneme Harbor, Port Hueneme, CA.

NCI performed a reconnaissance study to determine the feasibility of modifications to the existing harbor entrance, turning basin and berthing areas for the purpose of accommodating deeper draft commercial and military ship traffic. Existing operational limits were assessed and alternative improvements to the approach channel, entrance channel, and turning basin were formulated to accommodate deeper draft and larger vessels. Alternatives were recommended in consultation with Port pilots to improve the narrow navigation channel conditions and the unusually adverse cross-current at the harbor entrance.

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