Summary: Lowell Creek Tunnel Repairs Design and Technical Documentation

This document is a comprehensive set of technical drawings and specifications for the Lowell Creek Tunnel Repairs project located in Seward, Alaska. The project, identified as Solicitation No. W911KB27BA0XX and Contract No. W911KB27CA0XX, is issued by the US Army Corps of Engineers Alaska District with an issue date of July 10, 2026, and represents a 65% Design, Quality Control phase (DQC). The project involves repair and renovation of an existing tunnel system that transports water, with detailed engineering plans addressing the intake transition tunnel, outlet transition tunnel, and invert repair sections. Key work includes demolition of deteriorated concrete and steel structures, installation of new reinforced concrete linings, flat bar scour protection systems, and anchor plate assemblies throughout various tunnel sections spanning from Station 0+55 to Station 21+84. The drawings specify material symbols, reference details, and construction methodologies for both intake and outlet portals, including temporary access routes and staging areas for equipment and personnel.

The technical documentation includes multiple cross-sectional views, elevation profiles, and detailed construction drawings showing existing conditions, proposed repairs, and typical tunnel section details. Specifications address concrete repair methods, steel reinforcement placement, water-resistant construction techniques, and installation of protective features such as scour protection systems at flat bar sections. The project documentation references photographs of existing conditions showing pipe connections, interior tunnel access points, ice buildup areas at creek confluences, and outlet portal conditions. The design is intended for contractor use in executing tunnel rehabilitation work that preserves the structural integrity of the water transport system while accommodating environmental factors specific to the Alaska coastal location.