South River IA 04-LDM-1074
mouth (Warren Co.) to confluence with Squaw Cr. in S2 T75N R24W Warren 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
- 12/27/2021 10:06:32 AM
- Updated
- 12/27/2021 10:14:45 AM
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 2018-2020 10910003 South
River near Ackworth
Iowa
DNR 6 BIO See
Below 1239 South River Bank Swallow Bend – Ackworth –
REMAP #305 Iowa
DNR 6 BIO See
Below 931 South River Ackworth 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 10910003 6 6/6/8 528 715 365 YES 4 / NA 4 / NA 6 / 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 10910003 6 35 / 3 6.7 8.2 7.8 0 7 NO Monitored Full Class BWW2 - 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 10910003 6 Ammonia 35 / 3 0.02 0.24 0.05 NA 0 / 0 7 NO Monitored Full 10910003 6 Chloride 36 / 3 4.9 32 14.1 NA 0 / 0 7 NO Monitored Full 10910003 6 Dissolved Oxygen 36 / 3 5.4 16.9 10.1 0 NA / NA 7 NO Monitored Full 10910003 6 pH 35 / 3 6.7 8.2 7.8 0 NA / NA 7 NO Monitored Full 10910003 6 Sulfate 36 / 3 9.2 53 35.9 0 NA / NA 7 NO Monitored Full 10910003 6 Temperature 36 / 3 0 30.2 12.3 0 NA / NA 7 NO Monitored Full Class BWW2 - 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 10910003 6 Aluminum 14 / 3 51 5.73 0.825 0 / 0 NO Monitored Full 10910003 6 Arsenic 13 / 3 2 1.13 1 0 / 0 NO Monitored Full 10910003 6 Cadmium 13 / 3 0.07 0.03 0.02 0 / 0 NO Monitored Full 10910003 6 Chromium 13 / 3 1 0.6 0.7 0 / 0 NO Monitored Full 10910003 6 Lead 13 / 3 0.58 0.16 0.12 0 / 0 NO Monitored Full 10910003 6 Nickel 13 / 3 9.4 4.1 3.6 0 / 0 NO Monitored Full 10910003 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10910003 6 Zinc 13 / 3 3 1.88 1.8 0 / 0 NO Monitored Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47f BMIBI BIT BMIBI Pass/ Fail 1239 9/23/20 464 47f MS Surber 30 Poor 51 Fail 931 8/2/18 474 47f MS Floating Art Sub 17 Poor 51 Fail Fish: 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 47f MS NA 47 Fair 36 Pass Overall: 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.
Class BWW2 - Biological Sampling:
Assessment Key Dates
1/3/2018 | Fixed Monitoring Start Date |
12/8/2020 | Fixed Monitoring End Date |
9/23/2020 | Biological Monitoring |
8/2/2018 | Biological Monitoring |
Methods
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
380 | Quantitative physical habitat assessment |
420 | Indicator bacteria monitoring |