Muddy Creek IA 02-IOW-2043
from mouth (S33 T80N R6W Johnson Co.) to headwaters in SW 1/4 S12 T80N R7W Johnson Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:13:04 AM
- Updated
- 2/1/2024 2:05:57 PM
The Presumptive Class A1 use was assessed as “not supported” due to levels of indicator bacteria (E. coli) that exceeded Iowa’s water quality criteria. The presumptive Class BWW1 use was assessed as “fully supported” based on biological sampling data and water quality monitoring data. Note: A TMDL covering the bacteria impairments for all segments, with the segment code prefix "IA 02-IOW" in the Iowa River Basin, was approved by EPA in 2018. Due to the completion of the TMDL, the IR category for the Class A1 use was changed from 5p (impaired; TMDL needed) to 4a (impaired; TMDL approved).
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description USGS 11 WQ CY 2018-2019 5454050 Muddy Cr abv Trtmnt
Outfall at North Liberty, IA USGS 11 WQ CY 2018-2019 5454052 Muddy Cr blw Trtmnt
Outfall at North Liberty, IA USGS 11 WQ CY 2018-2019 5454090 Muddy Creek at
Coralville, IA Iowa DNR 6 WQ CY 2012-2013 15520002 Muddy Creek at Golf
View Dr (MCB) Iowa DNR 6 WQ CY 2012-2013 15520003 Muddy Creek at 1 Ave
(MC3) Iowa DNR 6 WQ CY 2012-2013 16520003 Muddy Creek (MCR1) Iowa DNR 6 WQ CY 2012-2013 16520004 Muddy Creek (MCR2) Iowa DNR 6 BIO See Below 628 Muddy Creek North Liberty – MC2 Site ID Data Source ID # Samples / # Years 2012 Geometric Mean 2013 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15520002 6 21 / 2 1126 1520 Yes 19 90% Yes Evaluated Not 15520003 6 21 / 2 897 848 Yes 21 100% Yes Evaluated Not 16520003 6 21 / 2 724 1205 Yes 19 90% Yes Evaluated Not 16520004 6 21 / 2 949 707 Yes 19 90% Yes Evaluated 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 5454050 11 9 / 2 7 7.7 7.5 0 3 NO Evaluated Full 5454052 11 9 / 2 7.2 7.8 7.6 0 3 NO Evaluated Full 5454090 11 9 / 2 7.6 8.2 7.9 0 3 NO Evaluated 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 5454050 11 Dissolved Oxygen 9 / 2 7 13.5 9.2 0 NA / NA 3 NO Evaluated Full 5454052 11 Dissolved Oxygen 9 / 2 7.7 11.7 9.4 0 NA / NA 3 NO Evaluated Full 5454090 11 Dissolved Oxygen 9 / 2 7.9 14.4 10.6 0 NA / NA 3 NO Evaluated Full 5454050 11 pH 9 / 2 7 7.7 7.5 0 NA / NA 3 NO Evaluated Full 5454052 11 pH 9 / 2 7.2 7.8 7.6 0 NA / NA 3 NO Evaluated Full 5454090 11 pH 9 / 2 7.6 8.2 7.9 0 NA / NA 3 NO Evaluated Full 5454050 11 Temperature 9 / 2 0.4 21.4 11 0 NA / NA 3 NO Evaluated Full 5454052 11 Temperature 9 / 2 7.1 20.6 15 0 NA / NA 3 NO Evaluated Full 5454090 11 Temperature 9 / 2 0 22 11 0 NA / NA 3 NO Evaluated Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47f BMIBI BIT BMIBI Pass/Fail 628 9/8/22 7.6 47f MS Surber 59 Good 51 Pass Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47f FIBI BIT FIBI Pass/Fail 628 9/8/22 7.6 47f MS NA 35 Fair 36 Pass* Overall:
Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (1/1) Full *FIBI score passed using the
7 pt. UAV applied to single samples. Fish Evaluated Pass (1/1) Full Assessment was evaluated because it was based on a single
sample and the Overall Evaluated Pass Full 1 drainage
area of the sample site was smaller than the calibrated range.
Presumptive Class A1 - Indicator Bacteria:
Presumptive Class A1 – pH:
Presumptive Class BWW1 - Binomial Parameters:
Presumptive Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates: