1. (a) All stream crossings, whether over tidal or non-tidal waters, shall be designed and constructed so as to:

   1. (1) Not be a barrier to sediment transport;
   2. (2) Not restrict high flows and maintain existing low flows;
   3. (3) Not obstruct or otherwise substantially disrupt the movement of aquatic organisms indigenous to the waterbody beyond the actual duration of construction;
   4. (4) Not cause an increase in the frequency of flooding or overtopping of banks;

   5. (5) Maintain or enhance geomorphic compatibility by:

      1. a. Minimizing the potential for inlet obstruction by sediment, wood, or debris; and
      2. b. Preserving the natural alignment of the stream channel;
   6. (6) Preserve watercourse connectivity where it currently exists;

   7. (7) Restore watercourse connectivity where:

      1. a. Connectivity previously was disrupted as a result of human activity(ies); and
      2. b. Restoration of connectivity will benefit aquatic organisms upstream or downstream of the crossing, or both;
   8. (8) Not cause erosion, aggradation, or scouring upstream or downstream of the crossing; and
   9. (9) Not cause water quality degradation.

2. (b) For stream crossings over tidal waters, the stream crossing shall be designed to:

   1. (1) Match the velocity, depth, cross-sectional area, and substrate of the natural stream; and
   2. (2) Be of sufficient size to not restrict bi-directional tidal flow over the natural tide range above, below, and through the crossing.

Source. #12809, eff 12-15-19