Nelson Park Lake IA 06-BOY-1506
Crawford County S2T82NR41W 4 mi. WNW of Dow City.
The Class A1 use was assessed (monitored) as “fully supported.” The Class BLW use was assessed (monitored) as “fully supported.” The Class HH use was assessed (monitored) as "fully supported" based on fish tissue monitoring.
Start Date: 05/27/2020 End Date: 09/03/2024 Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2020-2024 22240001 Nelson
Lake
Iowa DNR 6 FT See Below 1319 Nelson
Park Lake
Class A - 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 22240001 6 15 / 5 7.7 8.7 8.3 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 22240001 6 Chlorophyll a TSI 15 / 5 42 74 59 NO MONITORED FULL 22240001 6 Secchi TSI 15 / 5 39 81 51 NO MONITORED FULL 22240001 6 Total Phosphorus TSI 15 / 5 49 85 60 NA NA NA 22240001 6 Fixed suspended solids 15 / 5 0.7 11 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 22240001 6 Dissolved Oxygen 14 / 5 4.5 11.7 7.8 1 NA / NA 4 NO MONITORED FULL 22240001 6 pH 15 / 5 7.7 8.7 8.3 0 NA / NA 4 NO MONITORED FULL 22240001 6 Temperature 15 / 5 16.1 28.8 23.2 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 22240001 6 4 0.350226004 23.95% 0.097490221 4.08% 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 22240001 6 Ammonia 15 / 5 0.452 0.09 0.04 0 / 0 NO MONITORED 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) 1319 fillet 2024 channel catfish 3 43.5 0.042 <0.05 <0.0246 Support Level Full