Specifications include, but are not limited to: The intent of this project is to survey and design replacement structures for up to four existing road crossing structures in the Sally Ann Creek watershed near Clearwater, Idaho (See Figure 1 and Exhibit 3). The existing culvert structures are undersized and impede fish passage at various flows while contributing sediment to the stream. The bridge is a source of sediment and a failure risk, reducing the instream fish quality of the stream and watershed. The purpose of the project is to improve habitat conditions and to provide fish passage for steelhead and resident fish at all life histories.; Road Design: • Roadway width: Match existing conditions.; • Generally maintain existing vertical and horizontal alignment.; • Roadway Crown/Inslope: match existing.; Drainage Structures Design: • Design Loadings: Per AASHTO.; • Aquatic Organism Passage and Hydraulics: All structures, bridges, bottomless arches and culverts, shall be designed to pass the 100-year flood event with adequate freeboard for debris passage. Hydraulic analysis shall be completed using a one dimensional, steady flow, water surface profile analysis and as a minimum shall model the Q2, Q10, and Q100 flow volumes. The analysis shall include a comparison of the natural stream without any impacts of the existing crossing and proposed alternatives for the various flood events. Aquatic organism passage is also required. Stream velocities, depths, bedload transport, and hydraulic energy grade lines at the various flow volumes are of significant importance to maintaining natural stream features necessary for aquatic organism passage. The hydraulic analysis of all proposed alternatives must be comparable/compatible to the natural stream models.; • Structure Economics: Economical cost to the TRIBE shall be considered for all proposed alternatives but must meet the other criteria stated above. Low initial cost plus long-term maintenance shall be considered.; Surveys and Preliminary Design shall include: 1. The survey and design shall include hydraulic analysis and development of alternatives and preliminary construction quantities and cost estimates for each individual site.; 2. The Contractor shall prepare to meet with TRIBE, County, and potential project partners representatives to discuss the alternatives, merits, risks, estimated construction costs and issues. Preliminary design alternative drawings shall be presented illustrating roadway, stream and structure geometry and horizontal and vertical alignment, and summary of hydraulic analysis. The ultimate objective of the review meeting is to answer all questions and for the TRIBE and County to provide direction to the Contractor for final design.; 3. After the review meeting, the TRIBE shall prepare a memo documenting the meeting discussion and any decisions and direction given to the Contractor for final design.