Black Hawk Lake IA 04-RAC-1134

Assessment Comments

Monitored in 1990 by ISU for the Clean Lakes Classification study (1994); monitored for 1992 RAFT.

Basis for Assessment

Used assessments of support of the Class A primary contact recreation uses and the Class B(LW) aquatic life uses developed for the 1994 report.   In addition, used the results of analysis of 38 samples each collected from near the lake inlet and near the outlet in 1994 and 1995.   The only violations of WQ criteria were two violations of the Class B(LW) criterion for dissolved oxygen near the inlet.   This is not believed to suggest impaired water quality in the lake.   A report by Miller and Herrig (1996) states that lake restoration measures, including dredging, as well as installation of agricultural best management practices in the lake watershed, and installation of lake aeration, have improved the water quality and recreational potential for the lake.