Cloie Branch IA 01-TRK-134
mouth (S5 T89N R2E Dubuque Co.) to west line of S5 T89N R2E Dubuque Co.
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 10/27/2025 3:09:02 PM
- Updated
- 1/9/2026 11:07:54 AM
The presumptive Class A1 and Class A2 uses were assessed as "fully supported" based on pH monitoring data. The Class BCW1 use was assessed as "not supported" based on biological sampling data, grab sample temperature data, and continuous temperature monitoring data. All other designated uses were "not assessed." DNR is unsure that this segment should be designated as a coldwater stream. If this segment was assessed as a warm water stream segment, there would be no violations of the temperature water quality criteria. Additionally, the biological assessment of warm water aquatic life use would also indicate "full support."
DNR is unsure that this segment should be designated as a coldwater stream. If this segment was assessed as a warm water stream segment, there would be no violations of the temperature water quality criteria. Additionally, the biological assessment of the warm water 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 WQ CY 2022 12310006 Cloie
Branch-Durango
Iowa DNR 6 BIO & WQ See Below 836 Cloie
Branch Durango
(REMAP #389) Presumptive Class A1 - Indicator Bacteria: No Data Presumptive Class A1 & A2 – 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 12310006 6 7 / 1 7.32 8.37 7.91 0 3 NO EVALUATED FULL Class BCW1 - Binomial 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 12310006 6 Dissolved Oxygen 7 / 1 8.44 12.37 10.63 0 NA / NA 3 NO EVALUATED FULL 12310006 6 pH 7 / 1 7.32 8.37 7.91 0 NA / NA 3 NO EVALUATED FULL 12310006 6 Temperature 7 / 1 7.193 25.206 17.504 4 NA / NA 3 YES MONITORED NOT 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 7/13/21 5.6 52b MS/CW Hess 24 NA 60 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/1) Not 5bv Assessment was evaluated because it was based on a single
sample. 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 7/13/21 5.6 52b MS/CW Hess 68 Good 61 Pass BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Riffle Stream? FIBI score FIBI Class 52b FIBI BIT FIBI Pass/Fail 836 7/13/21 5.6 52b MS/CW NA 73 Excellent 52 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Pass (1/1) Full Fish Evaluated Pass (1/1) Full 1 Overall Evaluated Pass Full Assessment was evaluated because it was based on a single
sample. Continuous monitoring
data collected in 2013 and 2014 at Site 836 were examined for stream
temperature criteria violations. The maximum stream temperature recorded during
the sensor deployment period was 30.9 degrees (C). The BCW1 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 use was assessed as impaired
due to temperature.
Class HH - No Data
Class BCW1 -
Biological Sampling:
Overall Assessment:
(Theoretical Assessment) Class BWW1 - Biological Sampling:
Fish:
Overall:
Class BCW1 - Continuous Monitoring Data: