Cedar Creek IA 04-LDM-1053
mouth (S33 T75N R17W Mahaska Co.) to confluence with North Cedar Cr. in S15 T74N R18W Marion 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 8:52:02 AM
- Updated
- 10/16/2020 12:03:09 PM
Assessment Summary
The presumptive Class A1 use was assessed as "partially supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "fully supported" based on biological sampling and on water quality monitoring 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 10630002 Cedar Creek near Bussey Iowa DNR 6 BIO See Below 915 Cedar Creek Bussey Presumptive 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 10630002 6 21 / 3 723.85 574.38 239.28 Yes 11 52% Yes Monitored Partial Presumptive 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 10630002 6 36 / 3 8.4 7.7 7.8 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 10630002 6 Ammonia 36 / 3 0.38 0.07 0.02 0 / 0 0% / 0% No Monitored Full 10630002 6 Chloride 36 / 3 27 11 11 0 / 0 0% / 0% No Monitored Full 10630002 6 Dissolved oxygen 36 / 3 13.6 10 10.2 NA / 0 NA / 0% No Monitored Full 10630002 6 pH 36 / 3 8.4 7.7 7.8 0 / NA 0% / NA No Monitored Full 10630002 6 Sulfate 36 / 3 230 119 120 0 / NA 0% / NA No Monitored Full 10630002 6 Temperature 36 / 3 31.1 13.2 12.6 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 10630002 6 Aluminum 9 / 2 7 1.552 0.83 0 / 0 0% / 0% No Evaluated Full 10630002 6 Arsenic 9 / 2 1.4 0.77 0.77 0 / 0 0% / 0% No Evaluated Full 10630002 6 Cadmium 9 / 2 0.07 0.038 0.025 0 / 0 0% / 0% No Evaluated Full 10630002 6 Chromium 9 / 2 0.89 0.59 0.61 0 / 0 0% / 0% No Evaluated Full 10630002 6 Copper 9 / 2 1.9 1.34 1.2 0 / 0 0% / 0% No Evaluated Full 10630002 6 Lead 9 / 2 0.11 0.058 0.06 0 / 0 0% / 0% No Evaluated Full 10630002 6 Nickel 9 / 2 13 7.3 6.6 0 / 0 0% / 0% No Evaluated Full 10630002 6 Selenium 9 / 2 1.9 0.92 0.76 0 / 0 0% / 0% No Evaluated Full 10630002 6 Zinc 9 / 2 10 2.8 2.4 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 40a BMIBI BIT BMIBI Pass/ Fail 915 8/18/16 374 40a MS/WW Hess 46 Fair 41 Pass 915 9/23/15 374 40a MS/WW Float ArtSub 54 Fair 41 Pass Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 40a FIBI BIT FIBI Pass/ Fail 915 8/18/16 374 40a MS/WW NA 48 Fair 33 Pass Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Monitored Pass (2/2) Full Fish Evaluated Pass (1/1) Full Overall Monitored Pass Full 1 1 Assessment
is monitored because it was partially based on two BMIBI samples 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 10630002 6 Cadmium 9 / 2 0.07 0.038 0.025 6 No Evaluated Full 10630002 6 Chromium 9 / 2 0.89 0.59 0.61 0 No Evaluated Full 10630002 6 Copper 9 / 2 1.9 1.34 1.2 0 No Evaluated Full 10630002 6 Nickel 9 / 2 13 7.3 6.6 0 No Evaluated Full 10630002 6 Selenium 9 / 2 1.9 0.92 0.76 1 No Evaluated Full 10630002 6 Zinc 9 / 2 10 2.8 2.4 0 No Evaluated Full
Assessment Key Dates
1/11/2016 | Fixed Monitoring Start Date |
12/4/2018 | Fixed Monitoring End Date |
9/23/2015 | Biological Monitoring |
8/18/2016 | Biological Monitoring |
Methods
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 |