Green Castle Lake IA 02-IOW-643
Marshall County S8T82NR17W 1 mi. S of Ferguson.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trophic
- Eutrophic
- Trend
- Unknown
- Created
- 7/22/2020 2:47:14 PM
- Updated
- 10/14/2020 9:25:08 AM
The Class A1 use is assessed (monitored) as "fully supported." The Class BLW use is assessed (monitored) as “fully supported.” All other designated uses are “not assessed”.
Sources of
Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2015-2018 22640001 Green Castle Lake Green Castle Lake Deep Point 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 22640001 6 12 / 4 8.8 8.3 8.3 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 22640001 6 Chlorophyll a TSI 12 / 4 36 76 52 NO Monitored Full 22640001 6 Secchi TSI 12 / 4 43 59 50 NO Monitored Full 22640001 6 Total Phosphorus TSI 12 / 4 47 67 57 NA NA NA 22640001 6 Inorganic suspended solids 12 / 4 0.3 7 0.7 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 22640001 6 Ammonia 12 / 4 0.116 0.02 0.01 0 / 0 0% / 0% NO Monitored Full 22640001 6 Dissolved oxygen 12 / 4 10.7 8.2 8.5 NA / 0 NA / 0% NO Monitored Full 22640001 6 pH 12 / 4 8.8 8.3 8.3 0 / NA 0% / NA NO Monitored Full 22640001 6 Temperature 12 / 4 27.7 23.1 23.8 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 22640001 6 8 2.194 8.4 % 0.041 3.2 % NO Evaluated NA Class HH - No Data Note: Green Castle Lake was drained in 2013. Common carp and silt were removed from the lake and fish habitat improvements were made. Improvements in water clarity were observed in 2015 sampling season after the lake refilled.