White Breast Creek IA 04-LDM-1059
from mouth (S10 T76N R19W Marion Co.) to confluence with Little White Breast Cr. in S11 T73 R22 Lucas Co.
- Assessment Cycle
- 2024
- Release Status
- Pending
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:59 AM
- Updated
- 12/18/2023 11:17:29 AM
Assessment Summary
The Class A1 use was assessed as "not supported" due to levels of indicator bacteria that violated state water quality criteria. The Class BWW1 use was assessed as "fully supported" based on biological sampling data and on water quality monitoring data. The Class HH use was assessed as "fully supported" based on water quality monitoring 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 2020-2022 10630003 Whitebreast
Creek near Dallas
Iowa DNR 6 BIO See Below 1150 Whitebreast
Creek 10
miles SW of Knoxville Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 10630003 6 8/8/8 241 353 498 YES 4 / 3 4 / 3 4 / 3 YES Mon Not 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 10630003 6 35 / 3 6.8 8.6 7.9 0 7 NO Mon Full 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 10630003 6 Chloride 36 / 3 12 140 38 NA 0 / 0 7 NO Mon Full 10630003 6 Dissolved Oxygen 36 / 3 5.8 15.9 10.9 0 NA / NA 7 NO Mon Full 10630003 6 pH 35 / 3 6.8 8.6 7.9 0 NA / NA 7 NO Mon Full 10630003 6 Sulfate 36 / 3 29 170 47 0 NA / NA 7 NO Mon Full 10630003 6 Temperature 36 / 3 0 30.2 13.6 0 NA / NA 7 NO Mon Full 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 10630003 6 Ammonia 35 / 3 0.28 0.05 0.02 0 / 0 NO Mon Full 10630003 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10630003 6 Chromium 20 / 3 13 1.2 0.5 0 / 1 NO Mon Full 10630003 6 Lead 20 / 3 1 0.92 1 0 / 0 NO Mon Full 10630003 6 Nickel 20 / 3 4.5 3 3 0 / 0 NO Mon Full 10630003 6 Selenium 18 / 2 1 0.6 0.5 0 / 0 NO Mon Full 10630003 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10630003 6 Zinc 20 / 3 2.5 1 0.5 0 / 0 NO Mon Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 40a BMIBI BIT BMIBI Pass/Fail 1150 9/9/21 336.0 40a MS Surber 57 Fair 41 Pass 1150 7/20/17 336.0 40a MS Hess 54 Fair 41 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Pass (2/2) Full Assessment was monitored because the
samples used for Overall Monitored Pass Full 1 the assessment were collected in a
recent five year period. 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 10630003 6 Selenium 18 / 2 1 0.6 0.5 13 NO Mon Full
Class A1 - Indicator Bacteria:
Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 -
Biological Sampling:
Benthic Macroinvertebrates:
Overall:
Class HH-F - Toxic Parameters:
Assessment Key Dates
1/6/2020 | Monitoring Start |
12/1/2022 | Monitoring End |
7/20/2017 | Biological Monitoring |
9/9/2021 | Biological Monitoring |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |