1979 Map of Tyonek A-1 NW

About this map

Cook Inlet dominates this 1970s hydrographic and topographic study, showing the convergence of the Knik Arm and Turnagain Arm near the Matanuska-Susitna Borough and Municipality of Anchorage boundary. The northern tip of Fire Island is the primary terrestrial focus, serving as a critical infrastructure hub for the region. Beyond the tidally influenced Mud flats of the Susitna Flats, the island contains a concentration of aviation and communication assets, including an FAA Facility, a Radio Facility, and a Heliport. The landscape reveals a mix of utilitarian and recreational use, with a Ski Tow and Picnic Area located near Shelter Bay. Navigational aids like the Race Point Lights at Race Point underscore the island's role in guiding maritime traffic through these complex Alaskan waterways.