Ambient temperatures and water quality criteria for the protection of fish and other aquatic life

Ambient temperatures and water quality criteria for the protection of fish and other aquatic life. (1) General. In the absence of site-specific ambient temperature data or water quality criteria as determine in s. NR 102.26 or 102.27 , respectively, the applicable ambient temperatures, sub-lethal water quality criteria, and acute water quality criteria shall be as specified in subs. (2) to (5) . For determinations made in subs. (2) to (5) , all of the following conditions shall apply: (a) The ambient temperature, sub-lethal water quality criterion, and acute water quality criterion specified for any calendar month shall be applied simultaneously to establish the protection needed for each identified fish and other aquatic life use. (b) Sub-lethal water quality criteria are to be applied as maximum weekly average temperatures. (c) Acute water quality criteria are to be applied as daily maximum temperatures. (d) Water quality criteria for temperature shall be applied in accordance with the mixing zone provisions of s. NR 102.05 (3) . (e) Final acute and sub-lethal water quality criteria for temperature specified in or developed pursuant to ss. NR 102.24 to 102.26 shall not be exceeded at any point outside the mixing zone. Additionally, site-specific mixing zone studies may be required when deemed appropriate by the department. (2) Non-specific waters. The values listed in Table 2 shall be the applicable ambient temperatures, sub-lethal and acute water quality criteria for temperature for the protection of fish and aquatic life unless other values specified in subs. (3) to (5) are applicable or approved by the department pursuant to s. NR 102.26 or 102.27 . (3) Specific large rivers. The values listed in Table 3 shall be the applicable ambient temperatures, sub-lethal and acute water quality criteria for temperature for the protection of fish and aquatic life for the identified water segments unless other values are approved by the department pursuant to s. NR 102.26 or 102.27 . (4) Inland lakes and impoundments. The values listed in Table 4 shall be the applicable ambient temperatures, sub-lethal and acute water quality criteria for temperature for the protection of fish and aquatic life for inland lakes and impoundments unless other values are approved by the department pursuant to s. NR 102.26 or 102.27 . (5) Great lakes waters. The values listed in Table 5 shall be the applicable ambient temperatures, sub-lethal and acute water quality criteria for the protection of fish and aquatic life for Great Lakes waters identified in s. NR 102.22 (5) unless other values are approved by the department pursuant to s. NR 102.26 or 102.27 .