Spring Lake IA 04-RAC-1152
Greene County S25T84NR30W 3 mi NW of Grand Junction.
- Cycle
- 2022
- 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
- 12/28/2021 1:33:22 PM
- Updated
- 2/4/2022 7:20:10 AM
The Class A1 use was assessed (monitored) as “not supported” due to poor water transparency caused mainly by inorganic suspended solids that violated Iowa’s narrative water quality standard protecting against aesthetically objectionable conditions. The Class BLW use was assessed (monitored) as "fully supported." All other designated uses were “not assessed.” Note: A TMDL for turbidity at Spring Lake was prepared by DNR and approved by EPA in 2006. Because the primary Section 303(d) impairment identified for the current assessment/listing cycle (turbidity) was addressed by the TMDL, this waterbody was placed in IR Category 4a (impaired; TMDL approved).
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2016-2019 22370001 Spring
Lake Max Depth
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 22370001 6 12 / 4 8 8.9 8.5 0 4 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 22370001 6 Chlorophyll a TSI 12 / 4 26 73 59 NO Monitored Full 22370001 6 Secchi TSI 12 / 4 67 83 74 YES Monitored Not 22370001 6 Total Phosphorus TSI 12 / 4 60 77 67 NA NA NA 22370001 6 Inorganic suspended solids 12 / 4 0.6 21.4 5 NA NA NA Class BLW - Conventional 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 22370001 6 Ammonia 12 / 4 0.0003 0.1141 0.02 NA 0 / 0 4 NO Monitored Full 22370001 6 Dissolved Oxygen 12 / 4 8.5 11.2 9.5 0 NA / NA 4 NO Monitored Full 22370001 6 pH 12 / 4 8 8.9 8.5 0 NA / NA 4 NO Monitored Full 22370001 6 Temperature 12 / 4 14.9 28.6 23.5 0 NA / NA 4 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 Concentration = 75th Percentile Assessment Type Support Level 22370001 6 6 21.23 79.6% 6.75 71.1% NO Evaluated NA
Class HH: No Data