Wolf Creek IA 05-CHA-1339
mouth (S15 T71N R21W Lucas Co.) to confluence with unnamed tributary in E 1/2 NW 1/4 S8 T70N R22W Wayne Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 9/30/2020 1:57:40 PM
- Updated
- 10/12/2020 1:02:00 PM
The presumptive Class A1 use remains assessed as "not supported" due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class BWW2 use remains assessed as “partially supported” based on biological sampling data and on continuous dissolved oxygen and temperature monitoring data.
Data
Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description USACE 12 WQ CY 2010-2014 15590003 Wolf Creek at CR H50/430th (Site RA-41) USACE 12 WQ CY 2010-2014 15930007 Wolf Creek at CR S23/100th (Site RA-44) Iowa DNR 6 BIO See Below 207 Wolf Creek Chariton Presumptive
Class A1 - Indicator Bacteria: 2010-2012 Site ID Data Source ID # Samples / # Years 2010 Geometric Mean 2011 Geometric Mean 2012 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15590003 12 19 / 3 959 185 2469 Yes 15 79% Yes Evaluated Not 15930007 12 15 / 3 470 138 632 Yes 8 53% Yes Evaluated Partial Presumptive
Class A1 - pH: 2012-2014 Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15590003 12 53 / 3 8 7.5 7.6 0 0% No Evaluated Full 15930007 12 35 / 3 8 7.9 7.5 0 0% No Evaluated Full Class
BWW2 - Conventional Parameters: 2012-2014 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 15590003 12 Ammonia 28 / 3 0.66 0.11 0.05 0 / 0 0% / 0% No Evaluated Full 15930007 12 Ammonia 21 / 3 0.7 0.12 0.05 0 / 0 0% / 0% No Evaluated Full 15590003 12 Chloride 34 / 3 14 6.8 6.4 0 / 0 0% / 0% No Evaluated Full 15930007 12 Chloride 14 / 3 13 7.2 6.7 0 / 0 0% / 0% No Evaluated Full 15590003 12 Dissolved oxygen 53 / 3 11.7 8.3 7.9 NA / 1 NA / 2% No Evaluated Full 15930007 12 Dissolved oxygen 35 / 3 12.3 8.4 8.2 NA / 1 NA / 3% No Evaluated Full 15590003 12 pH 53 / 3 8 7.5 7.6 0 / NA 0% / NA No Evaluated Full 15930007 12 pH 35 / 3 8 7.9 7.5 0 / NA 0% / NA No Evaluated Full 15590003 12 Temperature 53 / 3 27.5 17.1 17.8 0 / 0 0% / 0% No Evaluated Full 15930007 12 Temperature 35 / 3 25.1 16.3 18.1 0 / 0 0% / 0% No Evaluated Full Class BWW2 - 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 207 9/14/15 66 40a MO/WW Hess 37 Fair 41 Fail 207 8/3/15 66 40a MO/WW Hess 43 Fair 41 Pass 207 9/12/12 66 40a MO/WW ArtSub 27 Poor 41 Fail 207 8/24/12 66 40a MO/WW ArtSub 36 Fair 41 Fail Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Riffle Stream? FIBI score FIBI Class 40a FIBI BIT FIBI Pass/ Fail 207 9/14/15 66 40a MO/WW NA 17 Poor 33 Fail 207 9/12/12 66 40a MO/WW NA 23 Poor 33 Fail Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (1/4) Partial
Fish Evaluated Fail (0/2) Not
Overall Evaluated Fail Partial 3bc 5bv Assessment
was evaluated because it included samples not collected in the last five
years. Class BWW2 – Continuous Monitoring
Data: The
results of continuous dissolved oxygen (DO) and temperature monitoring in 2012
for the DNR/SHL sampling project do suggest impairment of Class BWW2 aquatic
life uses. The lowest DO concentration recorded in 69 days of continuous
monitoring was 2.1 mg/L. The daily DO minimum concentration failed to meet the
24-hour DO criterion (4 mg/L) in 29 of 69 days and the 16-hour DO criterion (5
mg/L) in 9 of 69 days. The percentages exceeding the 24-hour and 16-hour DO
criteria (42.0% and 13.0%, respectively) were greater than (failing) the 10%
impairment threshold used to assess conventional water quality parameters. The
associated statistical analysis confidence level for the 24-hour analysis
result was high (>90%), while the confidence level for the 16-hour analysis
result was not high (<90%). The maximum stream temperature recorded during
the sensor deployment period was 34.2 degrees (C). The temperature criterion
for warm water interior streams (32 C) was exceeded in 15 of 69 days. The
percentage exceeding (21.7%) was greater than (failing) the 10% impairment
threshold with high statistical confidence (>90%). Based on these data, the
BWW2 aquatic life use was assessed as impaired for DO and temperature. The
assessment type is “evaluated” because it is based on data collected from a
single year within the current data assessment period. In order to meet the
requirements for a “monitored” assessment, the DNR’s continuous monitoring
assessment methodology requires monitoring data from two or more years within
the assessment period.