Brushy Creek Lake IA 04-UDM-1276
Webster Co. in S34 T88N R27W; 5 miles E. of Lehigh
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trophic
- Eutrophic
- Trend
- Stable
- Created
- 8/20/2020 8:25:02 AM
- Updated
- 10/14/2020 1:27:18 PM
The Class A1 uses are assessed (monitored) as “partially supported” due to violations of the state's indicator bacteria criteria. The Class BLW uses are assessed (evaluated) as “partially supported” due to invasive species. Class HH uses are assessed as "fully supporting" Based on fish tissue sampling.
Sources of
Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2016-2018 21940001 Brushy Creek (Brushy Creek Recreation
Area)
Iowa DNR 6 WQ CY 2014-2018 22940002 Brushy Creek Lake Lake Deep Point Iowa DNR FT See Below 285 Brushy Creek Lake
Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2016 Geometric Mean 2017 Geometric Mean 2018 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 21940001 6 17 / 3 39.96 32.25 530 Yes 2 12% No Monitored Partial Class A1 - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 22940002 6 15 / 5 8.5 8.1 8.2 0 0% NO Monitored 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 22940002 6 Chlorophyll a TSI 15 / 5 31 63 50 NO Monitored Full 22940002 6 Secchi TSI 15 / 5 34 62 54 NO Monitored Full 22940002 6 Total Phosphorus TSI 15 / 5 33 83 55 NA NA NA 22940002 6 Inorganic suspended solids 15 / 5 0.4 5.2 1.6 NA NA NA Class BLW -
Conventional Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations Significantly >10% Violations Assessment Type Support Level 22940002 6 Ammonia 15 / 5 0.331 0.1 0.05 0 / 0 0% / 0% NO Monitored Full 22940002 6 Dissolved oxygen 15 / 5 20.2 9.9 10 NA / 1 NA / 7% NO Monitored Full 22940002 6 pH 15 / 5 8.5 8.1 8.2 0 / NA 0% / NA NO Monitored Full 22940002 6 Temperature 15 / 5 27.5 20.28 22.8 0 / 0 0% / 0% NO Monitored 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 Wet Mass = 75th
Percentile Assessment Type Support Level 22940002 6 11 59.197 86.8 % 1.379 45.7 % NO Evaluated NA Class HH - Fish
Tissue Sampling: Site ID Date Species Name Biopart # in sample chlordane result chlordane violation? PCBs result PCBs violation? Hg result Hg violation? Assessment Type Support Level 285 8/30/16 largemouth bass plug 5
0.050 No Monitored Full 285 8/29/13 largemouth bass plug 5
0.232 No Evaluated Full 285 8/29/13 channel catfish fillet 3 <0.2 No <0.6 No <0.05 No Evaluated Full
Additional Information: The Class B(LW) (aquatic life) uses are assessed (evaluated) as “partially supported” based on information from the DNR Fisheries Bureau and results from the ISU lake surveys. Information from the DNR Fisheries Bureau indicates this lake has excessive growth of curly-leaf pondweed and brittle naiad. Additionally, Zebra mussel veligers were recently discovered in the lake.