Monona-Harrison Ditch IA 06-LSR-1580

Assessment Comments

Assessment is based on results of IDNR quarterly ambient monitoring near Turin 1993-1995.

Basis for Assessment

Continue to use the assessment of support of the Class B(WW) aquatic life uses developed for the 1996 report (=PS).   Results from the DNR quarterly WQ monitoring station S of Turin show one violations of the NH3 WQC in the 8 samples collected from Oct 93 to July 95.*  No other violations.  Thus, continue to assess support of the aquatic life uses as impaired (=PS).   Previous assessments suggest habitat alterations due to extensive channelization.   Follow-up monitoring is needed to better determine the status of the aquatic communities of this river reach and to determine the degree to which the Class B(WW) aquatic life uses may be impaired.   *Ammonia violation:  October 12, 1993, 8.6 mg/l (pH=8.3; water temperature=9.5C).