Cloie Branch IA 01-TRK-134
mouth (S5 T89N R2E Dubuque Co.) to west line of S5 T89N R2E Dubuque Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 8/14/2020 10:52:20 AM
- Updated
- 10/15/2020 6:50:31 AM
The Class BCW1 use remains assessed as "partially supported" based on biological sampling data, continuous DO data, and continuous temperature monitoring data. DNR is unsure that this segment should be classified as BCW1. If this segment were assessed as a WW segment, there would be no violations of the temperature and DO water quality criteria. Additionally, the biological assessment of the aquatic life use would also indicate "full support". All other designated uses were "not assessed".
DNR is unsure that this segment should be classified as BCW1. If this segment were assessed as a WW segment, there would be no violations of the temperature and DO water quality criteria. Additionally, the biological assessment of the aquatic life use would also indicate "full support". Data
Sources:
Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 836 Cloie Branch Durango Class
BCW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/ Fail 836 9/6/14 6 52b MS/CW Hess 34 NA 60 Fail 836 8/5/14 6 52b MS/CW Hess 31 NA 60 Fail 836 9/12/13 6 52b MS/CW Hess 15 NA 60 Fail 836 8/13/13 6 52b MS/CW Hess 25 NA 60 Fail Overall
Assessment: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/4) Partial 3bc 5bv Assessment
is evaluated because the samples were not collected in the last five years. (Theoretical Assessment) Class
BWW1 - Biological Sampling: Benthic Macroinvertebrates: BioNet
Site ID Date Drainage
Area (mi2) Ecoregion Major
Drainage/ Thermal BM
Sample Gear BMIBI
score BMIBI
Class 52b
BMIBI BIT BMIBI
Pass/ Fail 836 9/6/14 6 52b MS/CW Hess 66 Good 61 Pass 836 8/5/14 6 52b MS/CW Hess 51 Fair 61 Fail 836 9/12/13 6 52b MS/CW Hess 64 Good 61 Pass 836 8/13/13 6 52b MS/CW Hess 67 Good 61 Pass Fish: BioNet
Site ID Date Drainage
Area (mi2) Ecoregion Major
Drainage/ Thermal Riffle
Stream? FIBI
score FIBI
Class 52b
FIBI BIT FIBI
Pass/ Fail 836 9/6/14 6 52b MS/CW NA 76 Excellent 52 Pass 836 9/12/13 6 52b MS/CW NA 69 Good 52 Pass Overall:
Community Assessment
Type Assessment
Result Support
Level Earned
IR Category Actual
IR Category Reason Benthic Macroinvertebrates Evaluated Pass
(3/4) Full Fish Evaluated Pass
(2/2) Full Overall Evaluated Pass Full 1 5bv Assessment is evaluated because
the samples were not collected in the last five years. Class BCW1 - Continuous Monitoring Data Continuous monitoring data collected in 2013 and 2014 for the DNR/SHL coldwater stream sampling project were examined for DO and stream temperature criteria violations. The lowest DO concentration recorded in 126 days of continuous monitoring was 5.1 mg/L. The daily DO minimum concentration failed to meet the 24-hour DO criterion (5 mg/L) in 0 of 126 days. The percentage exceeding (0%) was less than (passing) the 10% impairment threshold used to assess conventional water quality parameters. The associated statistical analysis confidence level was high (>90%). In contrast, the 16-hour DO criterion (7 mg/L) was exceeded in 22 of 126 days. The percentage exceeding (17.5%) was greater than (failing) the 10% threshold with high statistical confidence (>90%). The maximum stream temperature recorded during the sensor deployment period was 30.9 degrees (C). The B(CW1) temperature criterion of 20 (C) was exceeded in 121 of 126 days. The percentage exceeding (96%) was greater than the 10% impairment threshold with high statistical confidence (>90%). Based on these data, the BCW1 aquatic life use was assessed as impaired due to DO and temperature.