Middle River IA 04-LDM-1083
mouth (Warren Co.) to confluence with Clanton Cr. in S28 T76N R25W Warren Co.
- Assessment Cycle
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 9/11/2020 1:43:04 PM
- Updated
- 10/16/2020 12:09:34 PM
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 "partially supported" based on biological sampling data. The Class HH use was assessed as "fully supported" based on water quality monitoring data.
Assessment Explanation
Sources of
Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2016-2018 10910001 Middle River near Indianola
Iowa DNR 6 BIO See Below 292 Middle River Indianola - REMAP #239 Iowa DNR 6 BIO See Below 927 CY 2016-2018 Indianola Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2016 Geometric Mean 2017 Geometric Mean 2018 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10910001 6 22 / 3 1217.12 345.44 928.55 Yes 18 82% Yes Monitored Not Class A1 - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10910001 6 36 / 3 8.7 8 8.1 0 0% No Monitored Full Class BWW1 -
Conventional Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations Significantly >10% Violations Assessment Type Support Level 10910001 6 Ammonia 36 / 3 0.23 0.05 0.02 0 / 0 0% / 0% No Monitored Full 10910001 6 Chloride 36 / 3 20 12.2 12 0 / 0 0% / 0% No Monitored Full 10910001 6 Dissolved oxygen 36 / 3 14.1 10.3 9.8 NA / 0 NA / 0% No Monitored Full 10910001 6 pH 36 / 3 8.7 8 8.1 0 / NA 0% / NA No Monitored Full 10910001 6 Sulfate 36 / 3 41 22 23 0 / NA 0% / NA No Monitored Full 10910001 6 Temperature 36 / 3 31 13 13 0 / 0 0% / 0% 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 % Acute/ Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 10910001 6 Aluminum 9 / 2 39 6.976 2.1 0 / 0 0% / 0% No Evaluated Full 10910001 6 Arsenic 9 / 2 2.8 1.585 1.6 0 / 0 0% / 0% No Evaluated Full 10910001 6 Cadmium 9 / 2 0.74 0.109 0.025 0 / 1 0% / 11% No Evaluated Full 10910001 6 Chromium 9 / 2 1.4 0.606 0.65 0 / 0 0% / 0% No Evaluated Full 10910001 6 Copper 9 / 2 2.6 1.3 1.2 0 / 0 0% / 0% No Evaluated Full 10910001 6 Lead 9 / 2 0.91 0.158 0.025 0 / 0 0% / 0% No Evaluated Full 10910001 6 Nickel 9 / 2 4.1 2.792 2.9 0 / 0 0% / 0% No Evaluated Full 10910001 6 Selenium 9 / 2 2.1 1.21 1.1 0 / 0 0% / 0% No Evaluated Full 10910001 6 Zinc 9 / 2 3.6 1.35 1.1 0 / 0 0% / 0% No Evaluated Full Class
BWW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 47f BMIBI BIT BMIBI Pass/ Fail 927 8/10/17 497 47f MS/WW Float ArtSub 31 Fair 51 Fail 927 7/30/14 497 47f MS/WW ArtSub 61 Good 51 Pass 927 9/18/13 497 47f MS/WW ArtSub 36 Fair 51 Fail Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 47f FIBI BIT FIBI Pass/ Fail 292 9/16/02 502 47f MS/WW NA 38 Fair 36 Pass 292 7/17/02 502 47f MS/WW NA 21 Poor 36 Fail Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (1/3) Partial Fish Evaluated Fail (1/2) Partial Overall Evaluated Fail Partial 5bt 5bt Assessment
is evaluated because it included samples not collected in the last five
years. 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 10910001 6 Cadmium 9 / 2 0.74 0.109 0.025 7 No Evaluated Full 10910001 6 Chromium 9 / 2 1.4 0.606 0.65 1 No Evaluated Full 10910001 6 Copper 9 / 2 2.6 1.3 1.2 0 No Evaluated Full 10910001 6 Nickel 9 / 2 4.1 2.792 2.9 1 No Evaluated Full 10910001 6 Selenium 9 / 2 2.1 1.21 1.1 1 No Evaluated Full 10910001 6 Zinc 9 / 2 3.6 1.35 1.1 0 No Evaluated Full
Assessment Key Dates
12/4/2018 | Fixed Monitoring End Date |
1/11/2016 | Fixed Monitoring Start Date |
7/17/2002 | Biological Monitoring |
9/16/2002 | Biological Monitoring |
9/18/2013 | Biological Monitoring |
7/30/2014 | 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 |
420 | Indicator bacteria monitoring |