South River IA 04-LDM-1074
mouth (Warren Co.) to confluence with Squaw Cr. in S2 T75N R24W Warren 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 8:12:59 AM
- Updated
- 12/18/2023 12:50:39 PM
Assessment Summary
The presumptive Class A1 use was assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW2 use was assessed as "not supported” based on biological 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 10910003 South
River near Ackworth
Iowa DNR 6 BIO See Below 931 South
River Ackworth Iowa DNR 6 BIO See Below 1239 South
River Bank
Swallow Bend – Ackworth (REMAP # 305) 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 10910003 6 8/7/8 365 768 651 YES 6 / 3 5 / 3 6 / 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 10910003 6 35 / 3 6.8 8.2 7.7 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 10910003 6 Chloride 36 / 3 9 26 14 NA 0 / 0 7 NO Mon Full 10910003 6 Dissolved Oxygen 36 / 3 6.9 14.7 10 0 NA / NA 7 NO Mon Full 10910003 6 pH 35 / 3 6.8 8.2 7.7 0 NA / NA 7 NO Mon Full 10910003 6 Sulfate 36 / 3 20 58 38 0 NA / NA 7 NO Mon Full 10910003 6 Temperature 36 / 3 0 26.5 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 10910003 6 Ammonia 35 / 3 0.21 0.04 0.02 0 / 0 NO Mon Full 10910003 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10910003 6 Chromium 20 / 3 2 0.54 0.5 0 / 0 NO Mon Full 10910003 6 Lead 20 / 3 1 0.91 1 0 / 0 NO Mon Full 10910003 6 Nickel 20 / 3 4.1 2.6 2.5 0 / 0 NO Mon Full 10910003 6 Selenium 18 / 2 2 0.7 0.5 0 / 0 NO Mon Full 10910003 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10910003 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 47f BMIBI BIT BMIBI Pass/Fail 931 8/10/22 474.0 47f MS Floating Art Sub 23 Poor 51 Fail 1239 9/23/20 464.0 47f MS Surber 30 Poor 51 Fail Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47f FIBI BIT FIBI Pass/Fail 1239 9/23/20 464.0 47f MS NA 47 Fair 36 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Fail (0/2) Not Fish Evaluated Pass (1/1) Full Assessment was monitored because the samples
used to complete Overall Monitored Fail Not 5bv the (BMIBI) assessment were collected in a
recent five-year period.
Presumptive Class A1 - Indicator Bacteria:
Presumptive Class A1 – pH:
Class BWW2 - Binomial Parameters:
Class BWW2 - Toxic Parameters:
Class BWW2 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Assessment Key Dates
1/7/2020 | Monitoring Start |
12/5/2022 | Monitoring End |
9/23/2020 | Biological Monitoring |
8/10/2022 | Biological Monitoring |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
420 | Indicator bacteria monitoring |