Middle Fork Little Maquoketa River IA 01-TRK-138
Alternate name(s) for this segment: Bankston Creek
from west line of S31 T90N R1E (Dubuque Co.) to north line of S33 T90N R1W Dubuque Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:30 AM
- Updated
- 1/31/2024 2:35:43 PM
The Class BCW1 use was assessed as "not supported" based on based on biological sampling data and "WINOFI" based on continuous temperature monitoring data. All other designated uses were "not assessed."
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 419 Middle Fork Little Maquoketa River Rickardsville – REMAP #261 BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/Fail 419 8/31/16 13 52b MS/CW Hess 45 NA 60 Fail 419 7/18/16 13 52b MS/CW Hess 49 NA 60 Fail 419 9/4/12 13 52b MS/CW Hess 35 NA 60 Fail 419 7/23/12 13 52b MS/CW Hess 42 NA 60 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/4) Not 5bv Assessment was evaluated because it included samples not
collected in the last five years. Site ID Data Source ID # Days Monitoring (2016) DO Criteria Type # 2016 violations / Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level 24 hr 4/12 No 419 6 72 16 hr 0/12 No Evaluated Full Class BCW1 - Continuous Temperature Monitoring: 2012 The maximum stream temperature recorded during the sensor deployment period was 22.8 degrees (C). The BCW1 temperature criterion of 20 (C) was exceeded in 22 of 55 days. The percentage exceeding (40%) was greater than (failing) the 10% impairment threshold with high statistical confidence (>90%). Based on those data, the BCW1 aquatic life use was assessed as "WINOFI"due to temperature criterion violations. The assessment type is “evaluated” because it is based on data collected from a single year. In order to meet the requirements for a “monitored” assessment, the DNR’s continuous monitoring assessment methodology requires monitoring data from two or more years within the assessment period.
Presumptive Class A1 - No Data
Class A2 - No Data
Class BCW1 - Biological Sampling:
Benthic Macroinvertebrates:
Overall Assessment:
Class BCW1 - Trout Reproduction:
Based on the January 2024 trout reproduction in Iowa streams summary prepared
by the DNR Fisheries Bureau, the Class BCW1 coldwater aquatic life use of
Middle Fork Little Maquoketa River (a.k.a. Bankston Cr.) was assessed as
"fully supported." According to the updated summary, this stream was
placed in Category I: streams that exhibit consistent natural reproduction and
maintain a wild population of one or more trout species without any stocking.
Class BCW1 – Continuous DO Monitoring: 2016
Class HH - No Data