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
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/28/2021 6:07:06 AM
- Updated
- 12/28/2021 6:09:57 AM
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 remains assessed as “not supported” due to violations of Iowa’s water quality chronic criteria for selenium. 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 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 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 10670003 6 0/0/7 NA NA 164 YES NA NA 3 / 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 10670003 6 36 / 3 7 8.6 8.1 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 10670003 6 Ammonia 36 / 3 0.025 1.6 0.1 NA 0 / 0 7 NO Monitored Full 10670003 6 Chloride 36 / 3 13 27 18 NA 0 / 0 7 NO Monitored Full 10670003 6 Dissolved Oxygen 36 / 3 6.7 15.1 10.5 0 NA / NA 7 NO Monitored Full 10670003 6 pH 36 / 3 7 8.6 8.1 0 NA / NA 7 NO Monitored Full 10670003 6 Sulfate 36 / 3 4.1 86 50.1 0 NA / NA 7 NO Monitored Full 10670003 6 Temperature 36 / 3 0 26.6 11.1 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 10670003 6 Aluminum 14 / 3 15 4.54 2.95 0 / 0 NO Monitored Full 10670003 6 Arsenic 13 / 3 3.6 2.1 1.9 0 / 0 NO Monitored Full 10670003 6 Cadmium 13 / 3 0.07 0.03 0.02 0 / 0 NO Monitored Full 10670003 6 Chromium 13 / 3 1.5 0.8 0.8 0 / 0 NO Monitored Full 10670003 6 Lead 13 / 3 0.2 0.1 0.1 0 / 0 NO Monitored Full 10670003 6 Nickel 13 / 3 5.3 3.5 3.2 0 / 0 NO Monitored Full 10670003 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10670003 6 Zinc 13 / 3 3.4 2.1 1.9 0 / 0 NO Monitored 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 922 10/7/15 4426 47d MO Floating Art Sub 60 Good 54 Pass 922 7/31/13 4426 47d MO Floating Art Sub 57 Good 54 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (2/3) Full Assessment was evaluated
because the drainage area of the site was Overall Evaluated Pass Full 1 greater than the
calibrated range.
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class HH – No Data
Assessment Key Dates
12/2/2020 | Fixed Monitoring End Date |
7/31/2013 | Biological Monitoring |
10/7/2015 | Biological Monitoring |
1/9/2018 | Fixed Monitoring Start Date |
9/18/2019 | Biological Monitoring |
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 |