Lake Smith IA 04-EDM-981
Kossuth County S36T96NR29W 3 mi. N of Algona.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trophic
- Eutrophic
- Trend
- Stable
- Created
- 11/1/2023 8:13:00 AM
- Updated
- 2/2/2024 3:55:46 PM
The Class A1 use was assessed (monitored) as “not supported” due to high levels of algae (chlorophyll a) and poor water clarity. The Class BLW use was assessed (monitored) as “fully supported.” The Class HH (fish consumption) use was assessed as "fully supported" based on fish tissue sampling data. A TMDL for noxious aquatic plants at Lake Smith was prepared by DNR and approved by EPA in 2005. The basis of the impairment at this lake was high populations of cyanobacteria (=noxious aquatic plants). Based on recent monitoring, a fish kill in the winter of 2000-01 and a subsequent lake renovation has significantly decreased the amount of cyanobacteria in this lake. Recent ISU lake monitoring data strongly suggest that the impairment due to noxious aquatic plants (cyanobacteria) no longer exists. Non-cyanobacteria algal populations, however, remain elevated at this lake and suggest "non support" of the Class A1 use. Because algae populations are addressed in the TMDL this lake is placed in IR Category 4a (impaired; TMDL approved) for the current assessment cycle.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2018-2022 22550001 Smith
Lake
Iowa DNR 6 FT See Below 1308 Smith Lake Smith Lake Park Class A1 - Indicator Bacteria: No Data Class A1 - pH: Site ID Data Source ID # Samples / # Years Minimum Value Maximum Value Mean Value # Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 22550001 6 12 / 4 7.8 9.2 8.6 3 4 NO Mon Full Class A1 - Lake TSI's: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Median Value Median TSI Violation? Assessment Type Support Level 22550001 6 Chlorophyll a TSI 12 / 4 44 76 64 NO Mon Full 22550001 6 Secchi TSI 12 / 4 45 76 64 NO Mon Full 22550001 6 Total Phosphorus TSI 12 / 4 64 87 78 NA NA NA 22550001 6 Inorganic suspended solids 12 / 4 0.6 8 2 NA NA NA 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 22550001 6 Dissolved Oxygen 11 / 4 5.4 12.8 9.4 0 NA / NA 3 NO Mon Full 22550001 6 pH 12 / 4 7.8 9.2 8.6 3 NA / NA 4 NO Mon Full 22550001 6 Temperature 12 / 4 15.9 28.8 23.8 0 NA / NA 4 NO Mon Full Class BLW - Lake Planktonic Cyanobacteria: Site ID Data Source ID # Samples Maximum Cyanobacteria Wet Mass Maximum Cyanobacteria % Composition Median Cyanobacteria Wet Mass Median Cyanobacteria % Composition Median Cyanobacteria Concentration = 75th Percentile Assessment Type Support Level 22550001 6 4 3.340740126 11% 2.075293686 4% NO Evaluated NA Class BLW - Toxic Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 22550001 6 Ammonia 12 / 4 0.088 0.04 0.04 0 / 0 NO Mon Full Class HH - Fish
Tissue Sampling: Site ID Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) Chlordane (ppm) Sum PCBs (ppm) 1308 fillet 2013 channel catfish 4 56.5 0.06 <0.2 <0.6 1308 tissue plug 2013 largemouth bass 5 36.6 0.248
Support Level Full