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
- 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 9:48:44 AM
- Updated
- 12/27/2021 9:50:43 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 BWW1 use was assessed as "fully supported" based on biological sampling and on water quality monitoring 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 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 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 10630002 6 7/6/8 239 622 196 YES 3 / 3 4 / NA 3 / 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 10630002 6 35 / 3 6.4 8.4 7.6 1 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 10630002 6 Ammonia 35 / 3 0.02 0.29 0.07 NA 0 / 0 7 NO Monitored Full 10630002 6 Chloride 36 / 3 5.6 15 10 NA 0 / 0 7 NO Monitored Full 10630002 6 Dissolved Oxygen 36 / 3 6.3 13.2 9.9 0 NA / NA 7 NO Monitored Full 10630002 6 pH 35 / 3 6.4 8.4 7.6 1 NA / NA 7 NO Monitored Full 10630002 6 Sulfate 36 / 3 33 230 103 0 NA / NA 7 NO Monitored Full 10630002 6 Temperature 36 / 3 0 31.1 12.6 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 10630002 6 Aluminum 14 / 3 27 3.267 0.965 0 / 0 NO Monitored Full 10630002 6 Arsenic 13 / 3 1.4 0.7 0.7 0 / 0 NO Monitored Full 10630002 6 Cadmium 13 / 3 0.07 0.03 0.02 0 / 0 NO Monitored Full 10630002 6 Chromium 13 / 3 0.9 0.6 0.6 0 / 0 NO Monitored Full 10630002 6 Lead 13 / 3 0.27 0.1 0.08 0 / 0 NO Monitored Full 10630002 6 Nickel 13 / 3 13 7 7 0 / 0 NO Monitored Full 10630002 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10630002 6 Zinc 13 / 3 10 3.8 3 0 / 0 NO Monitored Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 40a BMIBI BIT BMIBI Pass/ Fail 915 8/15/19 374 40a MS Surber 42 Fair 41 Pass 915 8/18/16 374 40a MS Hess 46 Fair 41 Pass Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 40a FIBI BIT FIBI Pass/ Fail 915 8/18/16 374 40a MS NA 48 Fair 33 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Pass (2/2) Full
Fish Monitored Pass (1/1) Full 1 Assessment was monitored
because the samples used to complete Overall Monitored Pass Full the assessment were
collected in a recent five year period.
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class HH – No Data
Assessment Key Dates
1/2/2018 | Fixed Monitoring Start Date |
12/1/2020 | Fixed Monitoring End Date |
8/15/2019 | 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 |
380 | Quantitative physical habitat assessment |
420 | Indicator bacteria monitoring |