Soldier River IA 06-SOL-1673
mouth (S17 T80N R45W Harrison Co.) to confluence with Jordan Cr. in S16 T82N R43W Monona Co.
- Assessment Cycle
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 9/22/2020 1:18:40 PM
- Updated
- 10/13/2020 2:39:01 PM
Assessment Summary
The presumptive Class A1 use remains assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "partially supported” based on biological sampling data and "not supported" due to levels of selenium that violated state water quality chronic criteria. The Class HH use was assessed as "fully supported" based on water quality monitoring data.
Assessment Explanation
Sources
of Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2014-2016, 2016-2018 10430002 Soldier River near Pisgah Iowa DNR 6 BIO See Below 183 Soldier River Pisgah Presumptive
Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2014 Geometric Mean 2015 Geometric Mean 2016 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10430002 6 23 / 3 660 1116 1127 Yes 19 83% Yes Evaluated Not 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 10430002 6 34 / 3 8.5 8.1 8.2 0 0% No Monitored Full Class
BWW1 - 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 10430002 6 Ammonia 34 / 3 1.9 0.09 0.02 0 / 0 0% / 0% No Monitored Full 10430002 6 Chloride 36 / 3 30 16.6 16 0 / 0 0% / 0% No Monitored Full 10430002 6 Dissolved oxygen 36 / 3 14.3 10.3 10.2 NA / 0 NA / 0% No Monitored Full 10430002 6 pH 34 / 3 8.5 8.1 8.2 0 / NA 0% / NA No Monitored Full 10430002 6 Sulfate 36 / 3 51 31 31 0 / NA 0% / NA No Monitored Full 10430002 6 Temperature 36 / 3 23.9 11.4 10.9 0 / 0 0% / 0% No Monitored Full Class
BWW1 - Toxic Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 10430002 6 Aluminum 9 / 2 31 8.65 4.6 0 / 0 0% / 0% No Evaluated Full 10430002 6 Arsenic 9 / 2 4.2 2.7 2.5 0 / 0 0% / 0% No Evaluated Full 10430002 6 Cadmium 9 / 2 0.12 0.036 0.025 0 / 0 0% / 0% No Evaluated Full 10430002 6 Chromium 9 / 2 1.7 0.93 0.96 0 / 0 0% / 0% No Evaluated Full 10430002 6 Copper 9 / 2 1.9 1 0.7 0 / 0 0% / 0% No Evaluated Full 10430002 6 Lead 9 / 2 0.23 0.086 0.08 0 / 0 0% / 0% No Evaluated Full 10430002 6 Nickel 9 / 2 4.1 2.7 2.6 0 / 0 0% / 0% No Evaluated Full 10430002 6 Selenium 9 / 2 9.2 6.8 7.4 0 / 8 0% / 89% Yes Evaluated Not 10430002 6 Zinc 9 / 2 5.3 1.69 0.89 0 / 0 0% / 0% No Evaluated Full Class
BWW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal BM Sample Gear BMIBI score BMIBI Class 47e BMIBI BIT BMIBI Pass/ Fail 183 8/30/16 408 47e MO/WW Float ArtSub 40 Fair 54 Fail 183 10/7/15 408 47e MO/WW Float ArtSub 52 Fair 54 Fail Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Monitored Fail (0/2) Partial 5bv 5bv Assessment
is monitored because both samples were collected in the last five years. Class
HH-F - Toxic Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value Number of Non - Detects Mean Value > Criterion or MCL Assessment Type Support Level 10430002 6 Cadmium 9 / 2 0.12 0.036 0.025 8 No Evaluated Full 10430002 6 Chromium 9 / 2 1.7 0.93 0.96 0 No Evaluated Full 10430002 6 Copper 9 / 2 1.9 1 0.7 0 No Evaluated Full 10430002 6 Nickel 9 / 2 4.1 2.7 2.6 0 No Evaluated Full 10430002 6 Selenium 9 / 2 9.2 6.8 7.4 0 No Evaluated Full 10430002 6 Zinc 9 / 2 5.3 1.69 0.89 0 No Evaluated Full
Assessment Key Dates
1/7/2014 | Fixed Monitoring Start Date |
12/7/2016 | Fixed Monitoring End Date |
10/7/2015 | Biological Monitoring |
8/30/2016 | Biological Monitoring |
1/5/2016 | Fixed Monitoring Start Date |
12/5/2018 | Fixed Monitoring End Date |
Methods
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |