South Fork Maquoketa River IA 01-MAQ-58
mouth (S16 T90N R6W Delaware Co.) to unnamed tributary in NE 1/4 SW 1/4 S30 T91N R7W Fayette Co.
- Cycle
- 2018
- Release Status
- Final
- Overall IR
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trend
- Unknown
- Created
- 5/9/2019 9:52:42 AM
- Updated
- 5/9/2019 9:56:37 AM
The presumptive Class A1 (primary contact recreation) uses remain "not assessed" due to the lack of information upon which to base an assessment. The Class B(WW2) aquatic life uses remain assessed (evaluated) as "fully supporting" based on data collected in 2005 as part of the DNR/SHL stream REMAP project and data collected in 2004 by DNR Fisheries Bureau: Manchester Research Station.
The assessment of the Class B(WW2) aquatic life uses was based on data collected in 2005 as part of the DNR/SHL stream REMAP project and data collected in 2004 by DNR Fisheries Bureau: Manchester Research Station. A series of biological metrics which reflect stream water quality and habitat integrity were calculated from the biological sampling data. The biological metrics are based on the numbers and types of benthic macroinvertebrate taxa and fish species collected in the stream sampling reach. The biological metrics were combined to make a fish community index of biotic integrity (FIBI) and a benthic macroinvertebrate index (BMIBI). The indexes rank the biological integrity of a stream sampling reach on a rising scale from 0 (minimum) to 100 (maximum). The 2005 FIBI score was 48 (fair) and the BMIBI score was 59 (good). The 2005 Fisheries FIBI score was 53 (good). The aquatic life use support was assessed as fully supporting (=FS), based on a comparison of the FIBI and BMIBI scores with biological impairment criteria (BIC) established for previous Section 305(b) reports. The non-riffle habitat FIBI BIC for this ecoregion is 44 and the artificial substrate BMIBI BIC for this ecoregion is 52. The biological impairment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-2008. This segment passed the FIBI BIC 2/2 times and passed the BMIBI BIC 1/1 times in the last 13 years.
This aquatic life assessment is considered "evaluated" because there were not two or more samples collected from this segment in multiple years from 2012-2016. Additionally, because these data are now considered too old (greater than five years) to accurately characterize current water quality conditions, the assessment category is considered “evaluated” (indicating an assessment with relatively lower confidence) as opposed to "monitored" (indicating an assessment with relatively higher confidence).