North Fork Maquoketa River IA 01-NMQ-91
confluence with Bear Cr (S31 T89NR2W Dubuque Co.) to confluence with unnamed tributary in S18 T90N R1W Dubuque Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trend
- Unknown
- Created
- 6/10/2020 12:33:45 PM
- Updated
- 10/14/2020 2:50:18 PM
The Class BWW2 aquatic life use remains assessed as “not supported” due to: (1) biological sampling data and (2) the multiple fish kill investigations. All other designated uses were "not assessed". Note: A TMDL for this biological impairment was approved by U.S. EPA in April 2007. Due to completion and approval of the TMDL, the Category for the Class BWW2 use was changed from 5a (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 Iowa DNR 6 BIO See Below 262 North Fork Maquoketa
River Dyersville – TMDL #28 Iowa DNR 6 BIO See Below 263 North Fork Maquoketa
River New Vienna – TMDL #29 Presumptive Class A1 – No Data Class BWW2 - Biological Sampling: Benthic Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/ Fail 262 7/25/05 39 47c MS/WW Hess 25 Poor 70 Fail 263 7/28/05 26 47c MS/WW Hess 45 Fair 70 Fail Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/ Fail 262 7/27/05 39 47c MS/WW No 36 Fair 44 Fail 263 7/28/05 26 47c MS/WW No 37 Fair 44 Fail Overall Assessment: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/2) Partial Fish Evaluated Fail (0/2) Partial Overall Evaluated Fail Partial 3bc 4a Assessment is evaluated because samples
were not collected in multiple years in the last five year period. Class BWW2 - Fish kill Assessment: The 2018 Class BWW2 use assessment based on
the four fish kills from 2004-2008 placed this segment in Category 5b. The fish
kills were caused by a “pollutant” or was suspected to be caused by a
“pollutant”; therefore, the Class BWW2 use was considered impaired. 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. However, because a TMDL was completed for the
biological impairment in this stream segment, the fish kill Class BWW2
assessments were placed in Category 4a for the 2008 assessment/listing cycle
and remain in Category 4a.