Barringer Slough IA 06-LSR-1631
Clay County S14T96NR35W 4 mi ENE of Dickens.
The Class BLW use was assessed as "not supported" due to violations of the class BLW criteria for dissolved oxygen. All other designated uses were “not assessed.”
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2018-2021 22100003 Barringer
Slough
Class BLW – Shallow Lake TSI: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Median Value Median TSI Violation? Assessment Type Support Level 22100003 6 Chlorophyll a TSI 7 / 2 27 46 37 NO Evaluated Full The TSI value for Secchi depth is not used to evaluate the
attainment of the aquatic life use in shallow lakes. Due to the depth of these
shallow lakes, TSI values for Secchi depth can be misleading. In some instances,
the Secchi disk remains visible at the bottom of the lake and the depth of the
lake is recorded as the Secchi depth. In these instances, water clarity may be
sufficient to support the Class BLW use, but the index value is limited by the
depth of the lake. Thus, the combination of total suspended solids and
chlorophyll a was used to determine whether or not the Class BLW use was
impaired in these shallow systems. Class BLW - Binomial Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value # Violations # Acute / Chronic Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 22100003 6 Dissolved Oxygen 6 / 2 0.21 9.77 2.94 4 NA / NA 3 YES Evaluated Not 22100003 6 pH 6 / 2 6.74 9.09 7.41 1 NA / NA 3 NO Evaluated Full 22100003 6 Temperature 6 / 2 17.1 24 20.5 0 NA / NA 3 NO Evaluated Full Class BLW - Protection of Submerged Aquatic Vegetation: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Median Value Median Value >= SAV Assessment Type Support Level 22100003 6 Total suspended solids 7 / 2 0.6 116 6.7 NO Evaluated Full Guidelines for wetland assessment from the Upper Mississippi
River Conservation Committee’s Water Quality Technical Section (2003) state
that a median total suspended solids concentration during the growing season of
less than 30 mg/L is necessary to provide sufficient water clarity to support
the growth of submersed aquatic vegetation (SAV) in wetlands and shallow lakes.
High levels of total suspended solids impede the growth of SAV. SAV is critical
to the health of wetland and shallow lake ecosystems. The elimination of SAV
can degrade habitat quality such that undesirable aquatic species such as
cyanobacteria, common carp and fathead minnows dominate. As such, the
suppression of SAV constitutes a violation of Iowa’s narrative water quality
criteria protecting against undesirable or nuisance aquatic life.
Class HH - No Data