English River IA 02-IOW-671
mouth (S12 T77N R6W Washington Co.) to confluence with Ramsey Cr. in S14 T77N R8W Washington Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:25 AM
- Updated
- 2/1/2024 7:49:47 AM
The Class A1 use was assessed as "not supported" due to levels of indicator bacteria that violated state water quality criteria. The Class BWW1 use was assessed as "fully supported" based on biological sampling data and water quality monitoring data. The Class HH use was assessed as "fully supported" based on water quality monitoring data. Note: A TMDL covering the bacteria impairments for all segments, with the segment code prefix "IA 02-IOW" in the Iowa River Basin, was approved by EPA in 2018. Due to the completion of the TMDL, the IR category for the Class A1 use was changed from 5a (impaired; TMDL needed) to 4a (impaired; TMDL approved).
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2020-2022 10920001 English River at
Riverside Iowa DNR 6 BIO See Below 287 English River Riverside 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 10920001 6 6/8/8 419 320 707 YES 3 / NA 6 / 3 5 / 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 10920001 6 36 / 3 7.4 8.3 8 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 10920001 6 Chloride 36 / 3 15 38 21 NA 0 / 0 7 NO Mon Full 10920001 6 Dissolved Oxygen 36 / 3 7.2 15 10.8 0 NA / NA 7 NO Mon Full 10920001 6 pH 36 / 3 7.4 8.3 8 0 NA / NA 7 NO Mon Full 10920001 6 Sulfate 36 / 3 14 58 30 0 NA / NA 7 NO Mon Full 10920001 6 Temperature 36 / 3 0.2 29.3 12.6 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 10920001 6 Ammonia 36 / 3 0.28 0.05 0.02 0 / 0 NO Mon Full 10920001 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10920001 6 Chromium 20 / 3 5 0.71 0.46 0 / 0 NO Mon Full 10920001 6 Lead 20 / 3 2 0.97 1 0 / 0 NO Mon Full 10920001 6 Nickel 20 / 3 3.4 1.9 1.8 0 / 0 NO Mon Full 10920001 6 Selenium 18 / 2 1 0.6 0.5 0 / 0 NO Mon Full 10920001 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10920001 6 Zinc 20 / 3 6.3 1.4 0.5 0 / 0 NO Mon Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 72d BMIBI BIT BMIBI Pass/Fail 287 8/7/20 627 72d MS Floating Art Sub 71 Good 51 Pass 287 9/6/16 627 72d MS Floating Art Sub 68 Good 51 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (2/2) Full Assessment was evaluated because the
drainage area of Overall Evaluated Pass Full 1 the sample site was greater 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 10920001 6 Selenium 18 / 2 1 0.6 0.5 13 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: