Cold Springs Lake IA 05-NSH-1420
Cass County S15T75NR37W 1 mi S of Lewis.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 1 - All designated uses are met.
- Trophic
- Eutrophic
- Trend
- Stable
- Created
- 8/26/2020 11:21:04 AM
- Updated
- 10/15/2020 7:47:10 AM
The Class A1 use is assessed (monitored) as “fully supported." The Class BLW use is assessed (monitored) as “fully supported.” Class HH use is assessed (monitored) as “fully supported” 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 2014-2018 22150001 Cold Springs Lake Lake Deep Point Iowa DNR
FT See Below 289 Cold Springs Lake
Class A1 -
Indicator Bacteria: No Data 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 22150001 6 15 / 5 9.4 8.6 8.7 2 13% 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 22150001 6 Chlorophyll a TSI 15 / 5 36 76 61 NO Monitored Full 22150001 6 Secchi TSI 15 / 5 43 71 62 NO Monitored Full 22150001 6 Total Phosphorus TSI 15 / 5 44 71 64 NA NA NA 22150001 6 Inorganic suspended solids 15 / 5 0.3 26 2.5 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 22150001 6 Ammonia 15 / 5 0.293 0.06 0.03 0 / 0 0% / 0% NO Monitored Full 22150001 6 Dissolved oxygen 15 / 5 13.31 8.6 8.3 NA / 1 NA / 7% NO Monitored Full 22150001 6 pH 15 / 5 9.4 8.6 8.7 2 / NA 13% / NA NO Monitored Full 22150001 6 Temperature 15 / 5 29.2 24.98 24.8 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 22150001 6 11 56.178 97.7 % 10.827 50.2 % 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 289 6/9/17 largemouth bass plug 3
0.230 No Monitored Full 289 8/8/14 largemouth bass plug 5
0.160 No Monitored Full
Note: According to Iowa DNR Fisheries Biologists,the clear water and shallow lake basin of Cold Springs Lakes has been ideal for growing aquatic plants. In 2014, a dye treatment was used to suppress aquatic plant growth. It worked very well reducing plant and algae growth down to an acceptable level. The dye treatment was repeated in 2015 with poor results. In 2016 the dye was applied at a higher rate in hopes to repeat 2014 results and it is working. Curly leaf pondweed an invasive plant showed up in Cold Springs a few years ago. Curly leaf pondweed has been on the increase ever since. In other lakes, curly leaf emerges early, crowds out native plants, and dies off in late June promoting algae blooms.