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1.Introduction DESCRIPTION OF THE UNDERTAKING The Undertaking will consist of replacing the existing Waiaka Bridge (Figure 4), constructed in 1932, with an approximately 53-foot wide by approximately 80-foot-long replacement bridge to accommodate two travel lanes,one in each direction, a shoulder/bike lane, and raised sidewalk. Additionally,the three approaches (ranging in distance from roughly 415-600 feet;see Figures 3)leading to the Waiaka Bridge will be realigned to create a smooth transition to the replacement bridge. The Kawaihae Road (State Route 19) and Kohala Mountain Road (State Route 250) intersection(see Figure 3)would be reconfigured to include a traffic signal or a roundabout.The APE(further defined below)is intended to accommodate the construction of either alternative. The project limits will extend to the west, east,and north for a sufficient distance to achieve a smooth transition.The objectives of the Undertaking are to replace the aging Waiaka Bridge,improve sight distances and intersection operations,and improving hydraulic conditions for Keanu`i`omano Stream beneath the Waiaka Bridge. The primary objective of the Undertaking is to replace the Waiaka Bridge with one that will conform to the guidelines set forth by the American Association of State Highways and Transportation Officials' (AASHTO) A Policy on Geometric Design for Highways and Streets.The AASHTO guidelines were adopted by the Agency for the planning and engineering of highway projects in Hawaii. The bridge design will follow current State planning and design guidelines for bridges encompassing lane widths, shoulders, pedestrian access, and railing heights. Additionally,the planning and engineering will need to conform to the Hawaii Statewide Uniform Design Manual for Streets and Highways(1980)and the guidelines related to the Americans with Disabilities(ADA)Act. A - ; II Wm is iirair—- -,-. i . . �, � I , emu,f s.-. .. ,_,..... z..w+k - \` ---). L P ,'' N L. - -'1 -i. vat Figure 4.Waiaka Bridge,view to the southwest. Historic Properties Assessment Study Waiaka Bridge and Roadway Project,South Kohala,Hawaii 5