Mud Creek IA 06-BSR-1546
mouth (S26 T98N R46W Lyon Co.) to the IA-MN state line
- Cycle
- 2022
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/28/2021 9:34:42 AM
- Updated
- 1/10/2022 10:04:52 AM
The Class A1 use was assessed as "not supported" due to levels of indicator bacteria and pH that violated state water quality criteria. The Class BWW2 use was assessed as “not supported” based on biological sampling data, the occurrence of a fish kill and due to violations of the pH water quality criteria.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description MNPCA 15 WQ CY 2018-2019 99990103 Mud Creek
Iowa DNR 6 BIO See Below 399 Mud Creek Lester – REMAP #136 Iowa DNR 6 BIO See Below 504 Mud Creek Alvord – REMAP #175 Class A1 - Indicator
Bacteria: Site ID Data Source ID # Samples per Year (2018/ 2019/2020) 2018 Geometric Mean 2019 Geometric Mean 2020 Geometric Mean Violates Annual Geometric Mean? # 2018 SSM violations / SSM Violations
needed for impairment # 2019 SSM violations / SSM Violations
needed for impairment # 2020 SSM violations / SSM Violations
needed for impairment Violates Annual SSM Significantly >10%
Rule? Assessment Type Support Level 99990103 15 6/5/0 748 1397 NA YES 5 / NA 4 / NA NA NA Evaluated Not Class A1 – 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 99990103 15 11 / 2 6.24 9.12 8.52 3 3 YES Monitored Not Class BWW2 -
Conventional 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 99990103 15 Dissolved Oxygen 11 / 2 6.92 12.25 9.65 0 NA / NA 3 NO Monitored Full 99990103 15 pH 11 / 2 6.24 9.12 8.52 3 NA / NA 3 YES Monitored Not 99990103 15 Temperature 11 / 2 5.2 17.4 14.1 0 NA / NA 3 NO Monitored Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47a BMIBI BIT BMIBI Pass/Fail 504 8/29/05 126 47a MO Hess 26 Poor 54 Fail 399 7/21/04 80 47a MO Art Sub 58 Good 54 Pass Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47a FIBI BIT FIBI Pass/Fail 504 8/29/05 126 47a MO NA 13 Poor 43 Fail 399 7/21/04 80 47a MO NA 20 Poor 43 Fail Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (1/2) Not
Fish Evaluated Fail (0/2) Full Assessment was evaluated
because the samples used to complete the Overall Evaluated Fail Not 5bt assessment were not collected
in a recent five year period. The Class BWW2 aquatic life use assessment based on the 2003 fish kill
placed this segment in Category 5b. The fish kill was caused by a “pollutant”
or was suspected to be caused by a “pollutant”; therefore, the Class BWW2 use
was considered impaired. Because the source of the pollutant was not identified
and/or the enforcement actions taken against the responsible party have not
been resolved, the Class BWW2 use was placed in Category 5b. Due to uncertainty
regarding the recovery of the aquatic life following the fish kill, any
existing fish kill 5b impairment will remain in Category 5b until more recent
sampling has shown recovery of the aquatic community or the responsible party
has paid restitution. More
details about the 2003 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/574
Class BWW2 - Biological Sampling:
Benthic Macroinvertebrates:
Class BWW2 – Fish kill Assessment: