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
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 9/21/2020 1:04:20 PM
- Updated
- 10/13/2020 2:33:37 PM
Assessment Summary
The Class A1 use remains assessed as "partially supported" due to violations of Iowa’s water quality criteria for indicator bacteria (E. coli). The Class BWW1 use was assessed as “partially supported” due to violations of Iowa’s water quality chronic criteria for selenium. 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, CY 2016-2018 10670003 Little Sioux River near Turin Iowa DNR 6 BIO See Below 922 Little Sioux River Turin 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 10670003 6 18 / 3 236 325 453 Yes 8 44% Yes Evaluated Partial 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 10670003 6 34 / 3 8.6 8.2 8.3 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 10670003 6 Ammonia 34 / 3 0.45 0.05 0.02 0 / 0 0% / 0% No Monitored Full 10670003 6 Chloride 36 / 3 28 20 20 0 / 0 0% / 0% No Monitored Full 10670003 6 Dissolved oxygen 36 / 3 15.1 10.5 10.8 NA / 0 NA / 0% No Monitored Full 10670003 6 pH 34 / 3 8.6 8.2 8.3 0 / NA 0% / NA No Monitored Full 10670003 6 Sulfate 36 / 3 78 55 56 0 / NA 0% / NA No Monitored Full 10670003 6 Temperature 36 / 3 26.1 12.2 11.1 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 10670003 6 Aluminum 9 / 2 15 5.31 3.8 0 / 0 0% / 0% No Evaluated Full 10670003 6 Arsenic 9 / 2 3.6 2.3 2 0 / 0 0% / 0% No Evaluated Full 10670003 6 Cadmium 9 / 2 0.025 0.025 0.025 0 / 0 0% / 0% No Evaluated Full 10670003 6 Chromium 9 / 2 1.5 0.75 0.79 0 / 0 0% / 0% No Evaluated Full 10670003 6 Copper 9 / 2 3 1.2 1.1 0 / 0 0% / 0% No Evaluated Full 10670003 6 Lead 9 / 2 0.16 0.067 0.05 0 / 0 0% / 0% No Evaluated Full 10670003 6 Nickel 9 / 2 4.9 2.9 2.8 0 / 0 0% / 0% No Evaluated Full 10670003 6 Selenium 9 / 2 9.7 4.5 3.9 0 / 3 0% / 33% Yes Evaluated Not 10670003 6 Zinc 9 / 2 3.4 1.43 1.2 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 47d BMIBI BIT BMIBI Pass/ Fail 922 10/7/15 4426 47d MO/WW Float ArtSub 60 Good 54 Pass 922 7/31/13 4426 47d MO/WW Float ArtSub 57 Good 54 Pass Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (2/2) Full 1 1 Assessment
is evaluated because the drainage area of the sample site was larger than the
calibrated range. 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 10670003 6 Cadmium 9 / 2 0.025 0.025 0.025 9 No Evaluated Full 10670003 6 Chromium 9 / 2 1.5 0.75 0.79 0 No Evaluated Full 10670003 6 Copper 9 / 2 3 1.2 1.1 0 No Evaluated Full 10670003 6 Nickel 9 / 2 4.9 2.9 2.8 0 No Evaluated Full 10670003 6 Selenium 9 / 2 9.7 4.5 3.9 0 No Evaluated Full 10670003 6 Zinc 9 / 2 3.4 1.43 1.2 0 No Evaluated Full
Assessment Key Dates
| 1/6/2016 | Fixed Monitoring Start Date |
| 12/5/2018 | Fixed Monitoring End Date |
| 7/31/2013 | Biological Monitoring |
| 10/7/2015 | Biological Monitoring |
| 10/2/2014 | Fixed Monitoring Start Date |
| 12/7/2016 | Fixed Monitoring End Date |
Methods
| 150 | Monitoring data more than 5 years old |
| 230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
| 315 | Regional reference site approach |
| 320 | Benthic macroinvertebrate surveys |
| 420 | Indicator bacteria monitoring |