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
- 2024
- Release Status
- Pending
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 11/1/2023 8:13:04 AM
- Updated
- 12/28/2023 12:35:14 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 "not supported” based on biological sampling data and 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
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2020-2022 10430002 Soldier
River near Pisgah
Iowa DNR 6 BIO See Below 183 Soldier
River Pisgah Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 10430002 6 8/7/8 552 787 262 YES 6 / 3 6 / 3 4 / 3 YES Mon Not 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 10430002 6 36 / 3 7.1 8.6 8.1 0 7 NO Mon Full 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 10430002 6 Chloride 36 / 3 13 23 17 NA 0 / 0 7 NO Mon Full 10430002 6 Dissolved Oxygen 36 / 3 7.6 13.7 10.3 0 NA / NA 7 NO Mon Full 10430002 6 pH 36 / 3 7.1 8.6 8.1 0 NA / NA 7 NO Mon Full 10430002 6 Sulfate 36 / 3 24 54 34 0 NA / NA 7 NO Mon Full 10430002 6 Temperature 36 / 3 0 24.9 10.8 0 NA / NA 7 NO Mon Full 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 10430002 6 Ammonia 36 / 3 0.34 0.04 0.02 0 / 0 NO Mon Full 10430002 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10430002 6 Chromium 20 / 3 4 1.09 1 0 / 0 NO Mon Full 10430002 6 Lead 20 / 3 1 0.91 1 0 / 0 NO Mon Full 10430002 6 Nickel 20 / 3 3.3 1.7 1.5 0 / 0 NO Mon Full 10430002 6 Selenium 18 / 2 8 6 6 0 / 9 YES Mon Not 10430002 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10430002 6 Zinc 20 / 3 8.9 1.4 0.5 0 / 0 NO Mon Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47e BMIBI BIT BMIBI Pass/Fail 183 9/15/20 408.5 47e MO Floating ArtSub 39 Fair 54 Fail 183 8/30/2016 408.5 47e MO Floating ArtSub 40 Fair 54 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/2) Not Assessment was evaluated
because one of the samples used Overall Evaluated Fail Not 5bv to complete the assessment was greater than
five years old. 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 Selenium 18 / 2 8 6 6 0 NO Mon Full
Presumptive Class A1 - Indicator Bacteria:
Presumptive Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Overall:
Class HH-F - Toxic Parameters:
Assessment Key Dates
9/15/2020 | Biological Monitoring |
8/30/2016 | Biological Monitoring |
1/7/2020 | Monitoring Start |
12/13/2022 | Monitoring End |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |