Little Sioux River IA 06-LSR-1565
from confluence with Maple R. (S17 T83N R44W Monona Co.) to confluence with Big Cr. in Anthon in S4 T87N R43W Woodbury 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 8:13:03 AM
- Updated
- 12/22/2023 9:28:52 AM
The Class A1 use was 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 "WINOFI" based on biological sampling data. The Class HH use was assessed as "fully supported" based on water quality monitoring data.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2020-2022 10970001 Little
Sioux River near Smithland
Iowa DNR 6 BIO See Below 845 Little
Sioux River Smithland 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 10970001 6 8/8/8 457 140 130 YES 5 / 3 3 / 3 2 / 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 10970001 6 36 / 3 7.3 8.5 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 10970001 6 Chloride 36 / 3 15 30 22 NA 0 / 0 7 NO Mon Full 10970001 6 Dissolved Oxygen 36 / 3 6.7 13.7 10.6 0 NA / NA 7 NO Mon Full 10970001 6 pH 36 / 3 7.3 8.5 8.1 0 NA / NA 7 NO Mon Full 10970001 6 Sulfate 36 / 3 35 120 80 0 NA / NA 7 NO Mon Full 10970001 6 Temperature 36 / 3 0 27.5 12.4 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 10970001 6 Ammonia 36 / 3 0.45 0.05 0.02 0 / 0 NO Mon Full 10970001 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10970001 6 Chromium 20 / 3 6 1.09 0.66 0 / 0 NO Mon Full 10970001 6 Lead 20 / 3 1 0.91 1 0 / 0 NO Mon Full 10970001 6 Nickel 20 / 3 4.4 2.2 2.1 0 / 0 NO Mon Full 10970001 6 Selenium 18 / 2 4 3 3 0 / 0 NO Mon Full 10970001 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10970001 6 Zinc 20 / 3 7 1.1 0.5 0 / 0 NO Mon Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47m BMIBI BIT BMIBI Pass/Fail 845 8/24/21 2686.7 47m MO Floating Art Sub 24 Poor 54 Fail 845 8/14/18 2686.7 47m MO Floating Art Sub 54 Good 54 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (1/2) WINOFI Assessment was evaluated because the
drainage area Overall Evaluated Fail WINOFI 3bu of the 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 10970001 6 Selenium 18 / 2 4 3 3 0 NO Mon 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: