Middle River IA 04-LDM-1083
mouth (Warren Co.) to confluence with Clanton Cr. in S28 T76N R25W 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 10:23:05 AM
- Updated
- 12/27/2021 10:27:12 AM
Assessment Summary
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 "not supported" based on biological sampling data. 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 10910001 Middle River near Indianola
Iowa DNR 6 BIO See Below 292 Middle River Indianola – REMAP #239 Iowa DNR 6 BIO See Below 927 Middle River Indianola 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 10910001 6 8/7/8 929 390 460 YES 6 / 3 4 / 3 4 / 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 10910001 6 35 / 3 7.1 8.7 8 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 10910001 6 Ammonia 35 / 3 0.02 0.19 0.04 NA 0 / 0 7 NO Monitored Full 10910001 6 Chloride 36 / 3 4.5 23 13.5 NA 0 / 0 7 NO Monitored Full 10910001 6 Dissolved Oxygen 36 / 3 6.4 13.5 10.2 0 NA / NA 7 NO Monitored Full 10910001 6 pH 35 / 3 7.1 8.7 8 0 NA / NA 7 NO Monitored Full 10910001 6 Sulfate 36 / 3 4 46 23 0 NA / NA 7 NO Monitored Full 10910001 6 Temperature 36 / 3 0 29.9 12.5 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 10910001 6 Aluminum 14 / 3 39 4.94 1.35 0 / 0 NO Monitored Full 10910001 6 Arsenic 13 / 3 2.8 1.5 1.3 0 / 0 NO Monitored Full 10910001 6 Cadmium 13 / 3 0.74 0.09 0.02 0 / 1 NO Monitored Full 10910001 6 Chromium 13 / 3 1.4 0.7 0.7 0 / 0 NO Monitored Full 10910001 6 Lead 13 / 3 0.91 0.17 0.1 0 / 0 NO Monitored Full 10910001 6 Nickel 13 / 3 4.1 3.1 3.2 0 / 0 NO Monitored Full 10910001 6 Silver 13 / 3 0.31 0.05 0.02 0 / 0 NO Monitored Full 10910001 6 Zinc 13 / 3 3.6 1.7 1.6 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 927 8/10/17 497 47f MS Floating Art Sub 31 Fair 51 Fail Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47f FIBI BIT FIBI Pass/Fail 292 9/16/02 502 47f MS NA 38 Fair 36 Pass 292 7/17/02 502 47f MS NA 21 Poor 36 Fail Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/1) Not
Fish Evaluated Fail (1/2) Not Assessment was evaluated
because it included samples not collected in Overall Evaluated Fail Not 5bt the last five years.
Class
BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class HH - No Data
Assessment Key Dates
12/8/2020 | Fixed Monitoring End Date |
1/3/2018 | Fixed Monitoring Start Date |
7/17/2002 | Biological Monitoring |
9/16/2002 | Biological Monitoring |
8/10/2017 | 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 |
330 | Fish surveys |
380 | Quantitative physical habitat assessment |
420 | Indicator bacteria monitoring |