Upper Pine Lake IA 02-IOW-760

Assessment Comments

Assessment is based on results oflake surveys and surveys by IDNR Fisheries Bureau.

Basis for Assessment

Fishable uses were assessed as PS and swimmable uses were not assessed for the following reasons: (1) BPJ of DNR staff; (2) the sedimentation rate (7.4 cm/yr) and life expectancy (29 years) are poor for the 86 SPO impoundments sampled in 1990 and 1992; while not in the worst 10%, they suggest an impairment due to ag NPSP; (3) summerkill frequency is 1 in 10 years; (4) although designated for swimmable uses, Bachmann et al.  report swimming use as zero (presume that lake is not developed for swimming).   Results of monitoring do not suggest impairments:  average levels of secchi depth, total-P, and TSS are approx equal to, or better than, overall averages for the 86 SPO impoundments sampled in 1990 and 1992; average level of chl-a is worse than overall average but is w/in 1 SD.