Little Sioux River IA 06-LSR-1564
mouth (Harrison Co.) to confluence with Maple R. near Turin in S17 T83N R44W 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
- Unknown
- Created
- 11/1/2023 8:13:03 AM
- Updated
- 1/12/2024 8:26:25 AM
Cycle Added | Class | Cause | Data Source | Rationale |
---|---|---|---|---|
2020 | Class BWW1 | Metals: Selenium | Ambient monitoring: Iowa DNR-rivers | New data: WQ improvement (chemical / physical / bacterial) |
Assessment Summary
The Class A1 use was assessed as "not supported" due to violations of Iowa’s water quality criteria for indicator bacteria (E. coli). The Class BWW1 use was assessed as “WINOFI” based on biological sampling data. The Class HH use was assessed as "fully supported" based on water quality monitoring data and fish tissue sampling 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 10670003 Little Sioux River
near Turin Iowa DNR 6 BIO See Below 922 Little Sioux River Turin Iowa DNR 6 FT See Below 1384 Little Sioux River (D) Little Sioux Access
Boat Ramp 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 10670003 6 7/8/8 164 193 59 YES 3 / 3 2 / 3 1 / 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 10670003 6 36 / 3 7.2 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 10670003 6 Chloride 36 / 3 15 30 21 NA 0 / 0 7 NO Mon Full 10670003 6 Dissolved Oxygen 36 / 3 5.9 14 10.4 0 NA / NA 7 NO Mon Full 10670003 6 pH 36 / 3 7.2 8.6 8.1 0 NA / NA 7 NO Mon Full 10670003 6 Sulfate 36 / 3 37 110 70 0 NA / NA 7 NO Mon Full 10670003 6 Temperature 36 / 3 0 26.6 11.9 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 10670003 6 Ammonia 36 / 3 0.33 0.05 0.02 0 / 0 NO Mon Full 10670003 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10670003 6 Chromium 20 / 3 5 1.1 0.8 0 / 0 NO Mon Full 10670003 6 Lead 20 / 3 1 0.91 1 0 / 0 NO Mon Full 10670003 6 Nickel 20 / 3 3.2 2.1 2 0 / 0 NO Mon Full 10670003 6 Selenium 18 / 2 5 4 4 0 / 0 NO Mon Full 10670003 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10670003 6 Zinc 20 / 3 2.9 0.9 0.5 0 / 0 NO Mon Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47d BMIBI BIT BMIBI Pass/Fail 922 9/18/19 4426 47d MO Floating Art Sub 35 Fair 54 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/1) WINOFI Assessment was
evaluated because it was based on a single sample and Overall Evaluated Fail WINOFI 3bu the drainage area of
the sample site was greater than the calibrated range. 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 10670003 6 Selenium 18 / 2 5 4 4 0 NO Mon Full Site ID Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) Chlordane (ppm) Sum PCBs (ppm) 1384 tissue plug 2021 channel catfish 10 43.4 0.143 Support Level Full
Class A1 - Indicator Bacteria:
Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Overall:
Class HH-F - Toxic Parameters:
Class HH - Fish Tissue
Sampling:
Assessment Key Dates
12/13/2022 | Monitoring End |
1/7/2020 | Monitoring Start |
9/18/2019 | Biological Monitoring |
7/15/2021 | Fish Tissue Monitoring |
7/28/2021 | Fish Tissue Monitoring |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |