Five Island Lake IA 04-UDM-1300

Assessment Comments

Assessment is based on results of (1) ISU lake survey in 2000-01, (2) surveys by IDNR Fisheries Bureau, (3) ISU report on lake plankton communities, and (4) results of U.S. EPA/IDNR fish tissue monitoring in 2001. See attached document for details.

Basis for Assessment

Both fishable and swimmable uses were asssessed as PS for the 1994 report for the following reasons:  (1) BPJ of DNR Fisheries; (2) results of monitoring in 1990 (pre-dredge) show some of the poorest water quality of any SPOL in Iowa; e.g., average levels of secchi depth chl-a, total-P, and TSS were all worse than overall averages for the 116 SPOLs sampled in 1990 and 1992 +/- 1 SD.   Results from 1993 sampling (concurrent w/ dredging) showed that WQ ranged from appox average to worse than average for Iowa SPOLs in 1993; (3) Hoyman et al.  (1994) report declines in uses for fishing and swimming due to excessive growth of macrophytes, poor water transparencies, and overabundance of rough fish (primarily carp and bullheads).   Lake is currently being dredged as part of a Cleans Lakes Program restoration project.   One of 60 surface samples sl.  > chronic criterion for NH3 on VIII:29:93.