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
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 6/4/2020 1:36:14 PM
- Updated
- 10/15/2020 11:45:25 AM
Assessment Summary
The Class A1 use was assessed as "partially supported" due to levels of indicator bacteria that violated state water quality criteria. The Class BWW1 use remains assessed as "partially supported" based on results of a fish kill investigation. The Class HH (fish consumption) use was assessed as "fully supported" based on water quality monitoring data. All other designated uses were "not assessed".
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 10630003 Whitebreast Creek
near Dallas Iowa DNR 6 BIO See Below 1150 Whitebreast Creek 10 mi SW of Knoxville 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 10630003 6 20 / 3 1156.4 501.21 367.2 Yes 14 70% Yes Monitored Partial Class A - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10%
Violations Assessment Type Support Level 10630003 6 36 / 3 8.5 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 10630003 6 Ammonia 36 / 3 0.46 0.07 0.02 0 / 0 0% / 0% No Monitored Full 10630003 6 Chloride 36 / 3 110 32.7 30.5 0 / 0 0% / 0% No Monitored Full 10630003 6 Dissolved oxygen 36 / 3 13.7 10.5 9.9 NA / 0 NA / 0% No Monitored Full 10630003 6 pH 36 / 3 8.5 8 8.1 0 / NA 0% / NA No Monitored Full 10630003 6 Sulfate 36 / 3 110 45 39 0 / NA 0% / NA No Monitored Full 10630003 6 Temperature 36 / 3 30.4 13.3 12.9 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 10630003 6 Aluminum 9 / 2 4.6 1.16 0.75 0 / 0 0% / 0% No Evaluated Full 10630003 6 Arsenic 9 / 2 2 1.26 1.1 0 / 0 0% / 0% No Evaluated Full 10630003 6 Cadmium 9 / 2 0.15 0.058 0.025 0 / 0 0% / 0% No Evaluated Full 10630003 6 Chromium 9 / 2 0.93 0.61 0.63 0 / 0 0% / 0% No Evaluated Full 10630003 6 Copper 9 / 2 3.5 2.2 2.1 1 / 1 11% / 11% No Evaluated Full 10630003 6 Lead 9 / 2 0.15 0.087 0.09 0 / 0 0% / 0% No Evaluated Full 10630003 6 Nickel 9 / 2 8.6 4.8 4.1 0 / 0 0% / 0% No Evaluated Full 10630003 6 Selenium 9 / 2 1.3 0.98 0.99 0 / 0 0% / 0% No Evaluated Full 10630003 6 Zinc 9 / 2 2.9 1.36 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 40a BMIBI BIT BMIBI Pass/ Fail 1150 7/20/17 336 40a MS/WW Hess 54 Fair 41 Pass 1150 9/9/15 336 40a MS/WW ArtSub 55 Fair 41 Pass Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Monitored Pass (2/2) Full 1 1 Assessment
is monitored because it was based on samples collected in the last five years. Class BWW1 – Fishkill Assessment: The Class BWW1 use
previously resided in Category 4d based on the assessment developed for the
2010 fish kill. Because no additional fish kills were reported in this segment
for at least five years post fish kill (2015), the Category for the fish kill
assessment was changed from 4d to 3b (potentially impaired). DNR believes that
any impact from the fish kill from which the impairment was based has likely
dissipated. If no additional fish kills are reported in the segment for an
additional five-year period (2020), the Category will be changed from 3b to 3a
(water not assessed). Details about the 2010 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/824. 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 10630003 6 Cadmium 9 / 2 0.15 0.058 0.025 6 No Evaluated Full 10630003 6 Chromium 9 / 2 0.93 0.61 0.63 0 No Evaluated Full 10630003 6 Copper 9 / 2 3.5 2.2 2.1 0 No Evaluated Full 10630003 6 Nickel 9 / 2 8.6 4.8 4.1 0 No Evaluated Full 10630003 6 Selenium 9 / 2 1.3 0.98 0.99 0 No Evaluated Full 10630003 6 Zinc 9 / 2 2.9 1.36 1.1 0 No Evaluated Full
Class HH - No Data
Assessment Key Dates
| 8/23/2010 | Fish Kill |
| 1/11/2016 | Fixed Monitoring Start Date |
| 12/4/2018 | Fixed Monitoring End Date |
| 9/9/2015 | Biological Monitoring |
| 7/20/2017 | Biological Monitoring |
Methods
| 120 | Surveys of fish and game biologists/other professionals |
| 140 | Incidence of spills and/or fish kills |
| 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 |