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
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 12/28/2021 6:50:04 AM
- Updated
- 12/28/2021 6:53:22 AM
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. All other designated uses were "not assessed."
Assessment Explanation
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2018-2020 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 per Year (2018/ 2019/2020) 2018 Geometric Mean 2019 Geometric Mean 2020 Geometric Mean Violates Annual Geometric Mean? # 2018 SSM violations / SSM Violations
needed for impairment # 2019 SSM violations / SSM Violations
needed for impairment # 2020 SSM violations / SSM Violations
needed for impairment Violates Annual SSM Significantly >10%
Rule? Assessment Type Support Level 10430002 6 0/0/8 NA NA 552 YES NA NA 6 / 3 YES Monitored Not Class A – 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 10430002 6 36 / 3 7.1 8.6 8 0 7 NO Monitored Full Class BWW1 -
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 10430002 6 Ammonia 36 / 3 0.025 1.7 0.1 NA 0 / 0 7 NO Monitored Full 10430002 6 Chloride 36 / 3 7.8 23 16.3 NA 0 / 0 7 NO Monitored Full 10430002 6 Dissolved Oxygen 36 / 3 6.7 13.7 10.3 0 NA / NA 7 NO Monitored Full 10430002 6 pH 36 / 3 7.1 8.6 8 0 NA / NA 7 NO Monitored Full 10430002 6 Sulfate 36 / 3 12 51 31 0 NA / NA 7 NO Monitored Full 10430002 6 Temperature 36 / 3 0 24.7 10.5 0 NA / NA 7 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 >1 Acute / Chronic Violation Assessment Type Support Level 10430002 6 Aluminum 14 / 3 31 7.16 3.9 0 / 0 NO Monitored Full 10430002 6 Arsenic 13 / 3 4.5 2.7 2.4 0 / 0 NO Monitored Full 10430002 6 Cadmium 13 / 3 0.05 0.03 0.02 0 / 0 NO Monitored Full 10430002 6 Chromium 13 / 3 1.7 1 1 0 / 0 NO Monitored Full 10430002 6 Lead 13 / 3 0.25 0.13 0.12 0 / 0 NO Monitored Full 10430002 6 Nickel 13 / 3 6.8 3.6 3.3 0 / 0 NO Monitored Full 10430002 6 Selenium 13 / 3 9.2 7.1 7.4 0 / 11 YES Monitored Not 10430002 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10430002 6 Zinc 13 / 3 8.9 3.1 3.2 0 / 0 NO Monitored 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 Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Fail (0/2) Not Assessment
was monitored because the two samples used to complete the Overall Monitored Fail Not 5bv assessment were collected
in the last five years.
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class HH – No Data
Assessment Key Dates
9/15/2020 | Biological Monitoring |
8/30/2016 | Biological Monitoring |
1/9/2018 | Fixed Monitoring Start Date |
12/2/2020 | 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 |