(1g)    In this section, “transportation activity” means an activity carried out under the direction and supervision of the department of transportation in connection with highway, bridge, or other transportation project design, location, construction, reconstruction, maintenance, or repair.

   (1m)   Transportation activities affecting waters of the state, as defined in s. 281.01 (18), are not subject to the prohibitions or permit or approval requirements specified under s. 29.601, 30.11, 30.12, 30.123, 30.19, 30.195, 30.20, 59.692, 61.351, 61.353, 62.231, 62.233, or 87.30 or chs. 281 to 285 or 289 to 299. However, at the earliest practical time prior to the commencement of these transportation activities, the department of transportation shall notify the department of the location, nature, and extent of the proposed work that may affect the waters of the state. This subsection does not apply beginning on the date on which the department of natural resources issues a general permit under s. 283.33 (4m) (b) 1.

   (1p)   Transportation activities affecting waters of the state, as defined in s. 281.01 (18), are not subject to the prohibitions or permit or approval requirements specified under s. 29.601, 30.11, 30.12, 30.123, 30.19, 30.195, 30.20, 59.692, 61.351, 61.353, 62.231, 62.233, or 87.30; or under chs. 281 and 283, except s. 283.33; or under chs. 285 or 289 to 299. At the earliest practical time prior to the commencement of these transportation activities, the department of transportation shall notify the department of the location, nature, and extent of the proposed work that may affect the waters of the state. This subsection applies beginning on the date on which the department of natural resources issues a general permit under s. 283.33 (4m) (b) 1.

   (2)   The exemptions under sub. (1m) or (1p) do not apply unless the transportation activity is accomplished in accordance with interdepartmental liaison procedures established by the department and the department of transportation for the purpose of minimizing the adverse environmental impact, if any, of the transportation activity. If the transportation activity affects a wetland, as defined in s. 23.32 (1), the department of transportation shall conduct any required mitigation either by complying with the interdepartmental liaison procedures and any applicable interagency agreement on mitigation banks that is approved by the department of natural resources or by using any of the methods specified in s. 281.36 (3r) (a) 1. to 3.

   (3)   If the department determines that there is reasonable cause to believe that a transportation activity being carried out under this section is not in compliance with the environmental protection requirements developed through interdepartmental liaison procedures, it shall notify the department of transportation. If the secretary and the secretary of transportation are unable to agree upon the methods or time schedules to be used to correct the alleged noncompliance, the secretary, notwithstanding the exemption provided in this section, may proceed with enforcement actions as the secretary deems appropriate.

   (4)   The department of transportation and the department shall exchange information and cooperate in the planning and carrying out of transportation activities in order to alleviate, to the extent practical under the circumstances, any potential detrimental encroachment on the waters of the state.

   (5)   Except as may be required otherwise under s. 1.11, no public notice or hearing is required in connection with any interdepartmental consultation and cooperation under this section.

   (6)   This section does not apply to transportation activities in the Lower Wisconsin State Riverway, as defined in s. 30.40 (15).