1. (1) If a highway-water crossing is a minor replacement as described under s. Trans 207.04 (10), the conceptual plan need only consist of a county map noting the site location and sufficient information to establish that the proposal meets the conditions set forth under s. Trans 207.04 (10). As a minimum, this would be a description of the existing and proposed structure with a comparative flowline elevation.

2. (2) All other replacements shall require the following information as part of the conceptual plan:

   1. (a) Site Map with a minimum scale of 1″= 660′ and a minimum area of coverage must include the width of the floodplain and extend ₁⁄⁴ mile upstream and ₁⁄⁴ mile downstream from site. Principal topographic features and the proposed highway and structure layout shall be shown. Contours are desirable but not mandatory. They can be aerial photos or based on an aerial photo.

      Note: Appropriate sources for maps include those from USGS and ASCS.

   2. (b) Profiles along centerline of roadway and center of stream bed, showing groundline, stream bottom, finished grade of road, elevation of upstream regional flood water if known, datum elevation, and at least one identifiable bench mark and reference elevation.

      Note: Datum elevation may be mean sea level or locally assumed.

   3. (c) Sketch of proposed structure, minimum scale 1″ = 50′, plan and profile view, major dimensions shown.
   4. (d) If the proposed structure is the replacement of an existing structure, sketch and describe the existing structure. Show an existing hydraulic cross-section of the structure including any related roadway overflow sections which form the waterway opening passing the regional flood.

   5. (e) Data shall include general dimensions, type and material of proposed structure, hydraulic data including regional flood backwater at the structure, if known, type of roadway fill, temporary and permanent erosion control features, elevation of water surface profile which has been established by zoning ordinance if any, and muck and peat excavation and disposal.

      Note: All or part of these requirements may be waived as stated in s. Trans 207.11.

History

History: Cr. Register, June, 1981, No. 306, eff. 7-1-81.